[PATCH OLK-6.6 192/452] sched_ext: Add selftests

From: David Vernet <dvernet@meta.com> mainline inclusion from mainline-v6.12-rc1 commit a5db7817af780db6a7f290c79677eff4fd13c5fa category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/ID7HLY Reference: https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commi... -------------------------------- Add basic selftests. Signed-off-by: David Vernet <dvernet@meta.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Zicheng Qu <quzicheng@huawei.com> Signed-off-by: cheliequan <cheliequan@inspur.com> Signed-off-by: Luo Gengkun <luogengkun2@huawei.com> --- tools/testing/selftests/sched_ext/.gitignore | 6 + tools/testing/selftests/sched_ext/Makefile | 218 ++++++++++++++++++ tools/testing/selftests/sched_ext/config | 9 + .../selftests/sched_ext/create_dsq.bpf.c | 58 +++++ .../testing/selftests/sched_ext/create_dsq.c | 57 +++++ .../sched_ext/ddsp_bogus_dsq_fail.bpf.c | 42 ++++ .../selftests/sched_ext/ddsp_bogus_dsq_fail.c | 57 +++++ .../sched_ext/ddsp_vtimelocal_fail.bpf.c | 39 ++++ .../sched_ext/ddsp_vtimelocal_fail.c | 56 +++++ .../selftests/sched_ext/dsp_local_on.bpf.c | 65 ++++++ .../selftests/sched_ext/dsp_local_on.c | 58 +++++ .../sched_ext/enq_last_no_enq_fails.bpf.c | 21 ++ .../sched_ext/enq_last_no_enq_fails.c | 60 +++++ .../sched_ext/enq_select_cpu_fails.bpf.c | 43 ++++ .../sched_ext/enq_select_cpu_fails.c | 61 +++++ tools/testing/selftests/sched_ext/exit.bpf.c | 84 +++++++ tools/testing/selftests/sched_ext/exit.c | 55 +++++ tools/testing/selftests/sched_ext/exit_test.h | 20 ++ .../testing/selftests/sched_ext/hotplug.bpf.c | 61 +++++ tools/testing/selftests/sched_ext/hotplug.c | 168 ++++++++++++++ .../selftests/sched_ext/hotplug_test.h | 15 ++ .../sched_ext/init_enable_count.bpf.c | 53 +++++ .../selftests/sched_ext/init_enable_count.c | 166 +++++++++++++ .../testing/selftests/sched_ext/maximal.bpf.c | 132 +++++++++++ tools/testing/selftests/sched_ext/maximal.c | 51 ++++ .../selftests/sched_ext/maybe_null.bpf.c | 36 +++ .../testing/selftests/sched_ext/maybe_null.c | 49 ++++ .../sched_ext/maybe_null_fail_dsp.bpf.c | 25 ++ .../sched_ext/maybe_null_fail_yld.bpf.c | 28 +++ .../testing/selftests/sched_ext/minimal.bpf.c | 21 ++ tools/testing/selftests/sched_ext/minimal.c | 58 +++++ .../selftests/sched_ext/prog_run.bpf.c | 32 +++ tools/testing/selftests/sched_ext/prog_run.c | 78 +++++++ .../testing/selftests/sched_ext/reload_loop.c | 75 ++++++ tools/testing/selftests/sched_ext/runner.c | 201 ++++++++++++++++ tools/testing/selftests/sched_ext/scx_test.h | 131 +++++++++++ .../selftests/sched_ext/select_cpu_dfl.bpf.c | 40 ++++ .../selftests/sched_ext/select_cpu_dfl.c | 72 ++++++ .../sched_ext/select_cpu_dfl_nodispatch.bpf.c | 89 +++++++ .../sched_ext/select_cpu_dfl_nodispatch.c | 72 ++++++ .../sched_ext/select_cpu_dispatch.bpf.c | 41 ++++ .../selftests/sched_ext/select_cpu_dispatch.c | 70 ++++++ .../select_cpu_dispatch_bad_dsq.bpf.c | 37 +++ .../sched_ext/select_cpu_dispatch_bad_dsq.c | 56 +++++ .../select_cpu_dispatch_dbl_dsp.bpf.c | 38 +++ .../sched_ext/select_cpu_dispatch_dbl_dsp.c | 56 +++++ .../sched_ext/select_cpu_vtime.bpf.c | 92 ++++++++ .../selftests/sched_ext/select_cpu_vtime.c | 59 +++++ .../selftests/sched_ext/test_example.c | 49 ++++ tools/testing/selftests/sched_ext/util.c | 71 ++++++ tools/testing/selftests/sched_ext/util.h | 13 ++ 51 files changed, 3244 insertions(+) create mode 100644 tools/testing/selftests/sched_ext/.gitignore create mode 100644 tools/testing/selftests/sched_ext/Makefile create mode 100644 tools/testing/selftests/sched_ext/config create mode 100644 tools/testing/selftests/sched_ext/create_dsq.bpf.c create mode 100644 tools/testing/selftests/sched_ext/create_dsq.c create mode 100644 tools/testing/selftests/sched_ext/ddsp_bogus_dsq_fail.bpf.c create mode 100644 tools/testing/selftests/sched_ext/ddsp_bogus_dsq_fail.c create mode 100644 tools/testing/selftests/sched_ext/ddsp_vtimelocal_fail.bpf.c create mode 100644 tools/testing/selftests/sched_ext/ddsp_vtimelocal_fail.c create mode 100644 tools/testing/selftests/sched_ext/dsp_local_on.bpf.c create mode 100644 tools/testing/selftests/sched_ext/dsp_local_on.c create mode 100644 tools/testing/selftests/sched_ext/enq_last_no_enq_fails.bpf.c create mode 100644 tools/testing/selftests/sched_ext/enq_last_no_enq_fails.c create mode 100644 tools/testing/selftests/sched_ext/enq_select_cpu_fails.bpf.c create mode 100644 tools/testing/selftests/sched_ext/enq_select_cpu_fails.c create mode 100644 tools/testing/selftests/sched_ext/exit.bpf.c create mode 100644 tools/testing/selftests/sched_ext/exit.c create mode 100644 tools/testing/selftests/sched_ext/exit_test.h create mode 100644 tools/testing/selftests/sched_ext/hotplug.bpf.c create mode 100644 tools/testing/selftests/sched_ext/hotplug.c create mode 100644 tools/testing/selftests/sched_ext/hotplug_test.h create mode 100644 tools/testing/selftests/sched_ext/init_enable_count.bpf.c create mode 100644 tools/testing/selftests/sched_ext/init_enable_count.c create mode 100644 tools/testing/selftests/sched_ext/maximal.bpf.c create mode 100644 tools/testing/selftests/sched_ext/maximal.c create mode 100644 tools/testing/selftests/sched_ext/maybe_null.bpf.c create mode 100644 tools/testing/selftests/sched_ext/maybe_null.c create mode 100644 tools/testing/selftests/sched_ext/maybe_null_fail_dsp.bpf.c create mode 100644 tools/testing/selftests/sched_ext/maybe_null_fail_yld.bpf.c create mode 100644 tools/testing/selftests/sched_ext/minimal.bpf.c create mode 100644 tools/testing/selftests/sched_ext/minimal.c create mode 100644 tools/testing/selftests/sched_ext/prog_run.bpf.c create mode 100644 tools/testing/selftests/sched_ext/prog_run.c create mode 100644 tools/testing/selftests/sched_ext/reload_loop.c create mode 100644 tools/testing/selftests/sched_ext/runner.c create mode 100644 tools/testing/selftests/sched_ext/scx_test.h create mode 100644 tools/testing/selftests/sched_ext/select_cpu_dfl.bpf.c create mode 100644 tools/testing/selftests/sched_ext/select_cpu_dfl.c create mode 100644 tools/testing/selftests/sched_ext/select_cpu_dfl_nodispatch.bpf.c create mode 100644 tools/testing/selftests/sched_ext/select_cpu_dfl_nodispatch.c create mode 100644 tools/testing/selftests/sched_ext/select_cpu_dispatch.bpf.c create mode 100644 tools/testing/selftests/sched_ext/select_cpu_dispatch.c create mode 100644 tools/testing/selftests/sched_ext/select_cpu_dispatch_bad_dsq.bpf.c create mode 100644 tools/testing/selftests/sched_ext/select_cpu_dispatch_bad_dsq.c create mode 100644 tools/testing/selftests/sched_ext/select_cpu_dispatch_dbl_dsp.bpf.c create mode 100644 tools/testing/selftests/sched_ext/select_cpu_dispatch_dbl_dsp.c create mode 100644 tools/testing/selftests/sched_ext/select_cpu_vtime.bpf.c create mode 100644 tools/testing/selftests/sched_ext/select_cpu_vtime.c create mode 100644 tools/testing/selftests/sched_ext/test_example.c create mode 100644 tools/testing/selftests/sched_ext/util.c create mode 100644 tools/testing/selftests/sched_ext/util.h diff --git a/tools/testing/selftests/sched_ext/.gitignore b/tools/testing/selftests/sched_ext/.gitignore new file mode 100644 index 000000000000..ae5491a114c0 --- /dev/null +++ b/tools/testing/selftests/sched_ext/.gitignore @@ -0,0 +1,6 @@ +* +!*.c +!*.h +!Makefile +!.gitignore +!config diff --git a/tools/testing/selftests/sched_ext/Makefile b/tools/testing/selftests/sched_ext/Makefile new file mode 100644 index 000000000000..0754a2c110a1 --- /dev/null +++ b/tools/testing/selftests/sched_ext/Makefile @@ -0,0 +1,218 @@ +# SPDX-License-Identifier: GPL-2.0 +# Copyright (c) 2022 Meta Platforms, Inc. and affiliates. +include ../../../build/Build.include +include ../../../scripts/Makefile.arch +include ../../../scripts/Makefile.include +include ../lib.mk + +ifneq ($(LLVM),) +ifneq ($(filter %/,$(LLVM)),) +LLVM_PREFIX := $(LLVM) +else ifneq ($(filter -%,$(LLVM)),) +LLVM_SUFFIX := $(LLVM) +endif + +CC := $(LLVM_PREFIX)clang$(LLVM_SUFFIX) $(CLANG_FLAGS) -fintegrated-as +else +CC := gcc +endif # LLVM + +ifneq ($(CROSS_COMPILE),) +$(error CROSS_COMPILE not supported for scx selftests) +endif # CROSS_COMPILE + +CURDIR := $(abspath .) +REPOROOT := $(abspath ../../../..) +TOOLSDIR := $(REPOROOT)/tools +LIBDIR := $(TOOLSDIR)/lib +BPFDIR := $(LIBDIR)/bpf +TOOLSINCDIR := $(TOOLSDIR)/include +BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool +APIDIR := $(TOOLSINCDIR)/uapi +GENDIR := $(REPOROOT)/include/generated +GENHDR := $(GENDIR)/autoconf.h +SCXTOOLSDIR := $(TOOLSDIR)/sched_ext +SCXTOOLSINCDIR := $(TOOLSDIR)/sched_ext/include + +OUTPUT_DIR := $(CURDIR)/build +OBJ_DIR := $(OUTPUT_DIR)/obj +INCLUDE_DIR := $(OUTPUT_DIR)/include +BPFOBJ_DIR := $(OBJ_DIR)/libbpf +SCXOBJ_DIR := $(OBJ_DIR)/sched_ext +BPFOBJ := $(BPFOBJ_DIR)/libbpf.a +LIBBPF_OUTPUT := $(OBJ_DIR)/libbpf/libbpf.a +DEFAULT_BPFTOOL := $(OUTPUT_DIR)/sbin/bpftool +HOST_BUILD_DIR := $(OBJ_DIR) +HOST_OUTPUT_DIR := $(OUTPUT_DIR) + +VMLINUX_BTF_PATHS ?= ../../../../vmlinux \ + /sys/kernel/btf/vmlinux \ + /boot/vmlinux-$(shell uname -r) +VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS)))) +ifeq ($(VMLINUX_BTF),) +$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)") +endif + +BPFTOOL ?= $(DEFAULT_BPFTOOL) + +ifneq ($(wildcard $(GENHDR)),) + GENFLAGS := -DHAVE_GENHDR +endif + +CFLAGS += -g -O2 -rdynamic -pthread -Wall -Werror $(GENFLAGS) \ + -I$(INCLUDE_DIR) -I$(GENDIR) -I$(LIBDIR) \ + -I$(TOOLSINCDIR) -I$(APIDIR) -I$(CURDIR)/include -I$(SCXTOOLSINCDIR) + +# Silence some warnings when compiled with clang +ifneq ($(LLVM),) +CFLAGS += -Wno-unused-command-line-argument +endif + +LDFLAGS = -lelf -lz -lpthread -lzstd + +IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \ + grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__') + +# Get Clang's default includes on this system, as opposed to those seen by +# '-target bpf'. This fixes "missing" files on some architectures/distros, +# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc. +# +# Use '-idirafter': Don't interfere with include mechanics except where the +# build would have failed anyways. +define get_sys_includes +$(shell $(1) -v -E - </dev/null 2>&1 \ + | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \ +$(shell $(1) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}') +endef + +BPF_CFLAGS = -g -D__TARGET_ARCH_$(SRCARCH) \ + $(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian) \ + -I$(CURDIR)/include -I$(CURDIR)/include/bpf-compat \ + -I$(INCLUDE_DIR) -I$(APIDIR) -I$(SCXTOOLSINCDIR) \ + -I$(REPOROOT)/include \ + $(call get_sys_includes,$(CLANG)) \ + -Wall -Wno-compare-distinct-pointer-types \ + -Wno-incompatible-function-pointer-types \ + -O2 -mcpu=v3 + +# sort removes libbpf duplicates when not cross-building +MAKE_DIRS := $(sort $(OBJ_DIR)/libbpf $(OBJ_DIR)/libbpf \ + $(OBJ_DIR)/bpftool $(OBJ_DIR)/resolve_btfids \ + $(INCLUDE_DIR) $(SCXOBJ_DIR)) + +$(MAKE_DIRS): + $(call msg,MKDIR,,$@) + $(Q)mkdir -p $@ + +$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \ + $(APIDIR)/linux/bpf.h \ + | $(OBJ_DIR)/libbpf + $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(OBJ_DIR)/libbpf/ \ + EXTRA_CFLAGS='-g -O0 -fPIC' \ + DESTDIR=$(OUTPUT_DIR) prefix= all install_headers + +$(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) \ + $(LIBBPF_OUTPUT) | $(OBJ_DIR)/bpftool + $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOLDIR) \ + ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD) \ + EXTRA_CFLAGS='-g -O0' \ + OUTPUT=$(OBJ_DIR)/bpftool/ \ + LIBBPF_OUTPUT=$(OBJ_DIR)/libbpf/ \ + LIBBPF_DESTDIR=$(OUTPUT_DIR)/ \ + prefix= DESTDIR=$(OUTPUT_DIR)/ install-bin + +$(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR) +ifeq ($(VMLINUX_H),) + $(call msg,GEN,,$@) + $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@ +else + $(call msg,CP,,$@) + $(Q)cp "$(VMLINUX_H)" $@ +endif + +$(SCXOBJ_DIR)/%.bpf.o: %.bpf.c $(INCLUDE_DIR)/vmlinux.h | $(BPFOBJ) $(SCXOBJ_DIR) + $(call msg,CLNG-BPF,,$(notdir $@)) + $(Q)$(CLANG) $(BPF_CFLAGS) -target bpf -c $< -o $@ + +$(INCLUDE_DIR)/%.bpf.skel.h: $(SCXOBJ_DIR)/%.bpf.o $(INCLUDE_DIR)/vmlinux.h $(BPFTOOL) | $(INCLUDE_DIR) + $(eval sched=$(notdir $@)) + $(call msg,GEN-SKEL,,$(sched)) + $(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $< + $(Q)$(BPFTOOL) gen object $(<:.o=.linked2.o) $(<:.o=.linked1.o) + $(Q)$(BPFTOOL) gen object $(<:.o=.linked3.o) $(<:.o=.linked2.o) + $(Q)diff $(<:.o=.linked2.o) $(<:.o=.linked3.o) + $(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked3.o) name $(subst .bpf.skel.h,,$(sched)) > $@ + $(Q)$(BPFTOOL) gen subskeleton $(<:.o=.linked3.o) name $(subst .bpf.skel.h,,$(sched)) > $(@:.skel.h=.subskel.h) + +################ +# C schedulers # +################ + +override define CLEAN + rm -rf $(OUTPUT_DIR) + rm -f *.o *.bpf.o *.bpf.skel.h *.bpf.subskel.h + rm -f $(TEST_GEN_PROGS) + rm -f runner +endef + +# Every testcase takes all of the BPF progs are dependencies by default. This +# allows testcases to load any BPF scheduler, which is useful for testcases +# that don't need their own prog to run their test. +all_test_bpfprogs := $(foreach prog,$(wildcard *.bpf.c),$(INCLUDE_DIR)/$(patsubst %.c,%.skel.h,$(prog))) + +auto-test-targets := \ + create_dsq \ + enq_last_no_enq_fails \ + enq_select_cpu_fails \ + ddsp_bogus_dsq_fail \ + ddsp_vtimelocal_fail \ + dsp_local_on \ + exit \ + hotplug \ + init_enable_count \ + maximal \ + maybe_null \ + minimal \ + prog_run \ + reload_loop \ + select_cpu_dfl \ + select_cpu_dfl_nodispatch \ + select_cpu_dispatch \ + select_cpu_dispatch_bad_dsq \ + select_cpu_dispatch_dbl_dsp \ + select_cpu_vtime \ + test_example \ + +testcase-targets := $(addsuffix .o,$(addprefix $(SCXOBJ_DIR)/,$(auto-test-targets))) + +$(SCXOBJ_DIR)/runner.o: runner.c | $(SCXOBJ_DIR) + $(CC) $(CFLAGS) -c $< -o $@ + +# Create all of the test targets object files, whose testcase objects will be +# registered into the runner in ELF constructors. +# +# Note that we must do double expansion here in order to support conditionally +# compiling BPF object files only if one is present, as the wildcard Make +# function doesn't support using implicit rules otherwise. +$(testcase-targets): $(SCXOBJ_DIR)/%.o: %.c $(SCXOBJ_DIR)/runner.o $(all_test_bpfprogs) | $(SCXOBJ_DIR) + $(eval test=$(patsubst %.o,%.c,$(notdir $@))) + $(CC) $(CFLAGS) -c $< -o $@ $(SCXOBJ_DIR)/runner.o + +$(SCXOBJ_DIR)/util.o: util.c | $(SCXOBJ_DIR) + $(CC) $(CFLAGS) -c $< -o $@ + +runner: $(SCXOBJ_DIR)/runner.o $(SCXOBJ_DIR)/util.o $(BPFOBJ) $(testcase-targets) + @echo "$(testcase-targets)" + $(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS) + +TEST_GEN_PROGS := runner + +all: runner + +.PHONY: all clean help + +.DEFAULT_GOAL := all + +.DELETE_ON_ERROR: + +.SECONDARY: diff --git a/tools/testing/selftests/sched_ext/config b/tools/testing/selftests/sched_ext/config new file mode 100644 index 000000000000..0de9b4ee249d --- /dev/null +++ b/tools/testing/selftests/sched_ext/config @@ -0,0 +1,9 @@ +CONFIG_SCHED_DEBUG=y +CONFIG_SCHED_CLASS_EXT=y +CONFIG_CGROUPS=y +CONFIG_CGROUP_SCHED=y +CONFIG_EXT_GROUP_SCHED=y +CONFIG_BPF=y +CONFIG_BPF_SYSCALL=y +CONFIG_DEBUG_INFO=y +CONFIG_DEBUG_INFO_BTF=y diff --git a/tools/testing/selftests/sched_ext/create_dsq.bpf.c b/tools/testing/selftests/sched_ext/create_dsq.bpf.c new file mode 100644 index 000000000000..23f79ed343f0 --- /dev/null +++ b/tools/testing/selftests/sched_ext/create_dsq.bpf.c @@ -0,0 +1,58 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Create and destroy DSQs in a loop. + * + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +void BPF_STRUCT_OPS(create_dsq_exit_task, struct task_struct *p, + struct scx_exit_task_args *args) +{ + scx_bpf_destroy_dsq(p->pid); +} + +s32 BPF_STRUCT_OPS_SLEEPABLE(create_dsq_init_task, struct task_struct *p, + struct scx_init_task_args *args) +{ + s32 err; + + err = scx_bpf_create_dsq(p->pid, -1); + if (err) + scx_bpf_error("Failed to create DSQ for %s[%d]", + p->comm, p->pid); + + return err; +} + +s32 BPF_STRUCT_OPS_SLEEPABLE(create_dsq_init) +{ + u32 i; + s32 err; + + bpf_for(i, 0, 1024) { + err = scx_bpf_create_dsq(i, -1); + if (err) { + scx_bpf_error("Failed to create DSQ %d", i); + return 0; + } + } + + bpf_for(i, 0, 1024) { + scx_bpf_destroy_dsq(i); + } + + return 0; +} + +SEC(".struct_ops.link") +struct sched_ext_ops create_dsq_ops = { + .init_task = create_dsq_init_task, + .exit_task = create_dsq_exit_task, + .init = create_dsq_init, + .name = "create_dsq", +}; diff --git a/tools/testing/selftests/sched_ext/create_dsq.c b/tools/testing/selftests/sched_ext/create_dsq.c new file mode 100644 index 000000000000..fa946d9146d4 --- /dev/null +++ b/tools/testing/selftests/sched_ext/create_dsq.c @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "create_dsq.bpf.skel.h" +#include "scx_test.h" + +static enum scx_test_status setup(void **ctx) +{ + struct create_dsq *skel; + + skel = create_dsq__open_and_load(); + if (!skel) { + SCX_ERR("Failed to open and load skel"); + return SCX_TEST_FAIL; + } + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct create_dsq *skel = ctx; + struct bpf_link *link; + + link = bpf_map__attach_struct_ops(skel->maps.create_dsq_ops); + if (!link) { + SCX_ERR("Failed to attach scheduler"); + return SCX_TEST_FAIL; + } + + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct create_dsq *skel = ctx; + + create_dsq__destroy(skel); +} + +struct scx_test create_dsq = { + .name = "create_dsq", + .description = "Create and destroy a dsq in a loop", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&create_dsq) diff --git a/tools/testing/selftests/sched_ext/ddsp_bogus_dsq_fail.bpf.c b/tools/testing/selftests/sched_ext/ddsp_bogus_dsq_fail.bpf.c new file mode 100644 index 000000000000..e97ad41d354a --- /dev/null +++ b/tools/testing/selftests/sched_ext/ddsp_bogus_dsq_fail.bpf.c @@ -0,0 +1,42 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + * Copyright (c) 2024 Tejun Heo <tj@kernel.org> + */ +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +UEI_DEFINE(uei); + +s32 BPF_STRUCT_OPS(ddsp_bogus_dsq_fail_select_cpu, struct task_struct *p, + s32 prev_cpu, u64 wake_flags) +{ + s32 cpu = scx_bpf_pick_idle_cpu(p->cpus_ptr, 0); + + if (cpu >= 0) { + /* + * If we dispatch to a bogus DSQ that will fall back to the + * builtin global DSQ, we fail gracefully. + */ + scx_bpf_dispatch_vtime(p, 0xcafef00d, SCX_SLICE_DFL, + p->scx.dsq_vtime, 0); + return cpu; + } + + return prev_cpu; +} + +void BPF_STRUCT_OPS(ddsp_bogus_dsq_fail_exit, struct scx_exit_info *ei) +{ + UEI_RECORD(uei, ei); +} + +SEC(".struct_ops.link") +struct sched_ext_ops ddsp_bogus_dsq_fail_ops = { + .select_cpu = ddsp_bogus_dsq_fail_select_cpu, + .exit = ddsp_bogus_dsq_fail_exit, + .name = "ddsp_bogus_dsq_fail", + .timeout_ms = 1000U, +}; diff --git a/tools/testing/selftests/sched_ext/ddsp_bogus_dsq_fail.c b/tools/testing/selftests/sched_ext/ddsp_bogus_dsq_fail.c new file mode 100644 index 000000000000..e65d22f23f3b --- /dev/null +++ b/tools/testing/selftests/sched_ext/ddsp_bogus_dsq_fail.c @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + * Copyright (c) 2024 Tejun Heo <tj@kernel.org> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "ddsp_bogus_dsq_fail.bpf.skel.h" +#include "scx_test.h" + +static enum scx_test_status setup(void **ctx) +{ + struct ddsp_bogus_dsq_fail *skel; + + skel = ddsp_bogus_dsq_fail__open_and_load(); + SCX_FAIL_IF(!skel, "Failed to open and load skel"); + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct ddsp_bogus_dsq_fail *skel = ctx; + struct bpf_link *link; + + link = bpf_map__attach_struct_ops(skel->maps.ddsp_bogus_dsq_fail_ops); + SCX_FAIL_IF(!link, "Failed to attach struct_ops"); + + sleep(1); + + SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_ERROR)); + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct ddsp_bogus_dsq_fail *skel = ctx; + + ddsp_bogus_dsq_fail__destroy(skel); +} + +struct scx_test ddsp_bogus_dsq_fail = { + .name = "ddsp_bogus_dsq_fail", + .description = "Verify we gracefully fail, and fall back to using a " + "built-in DSQ, if we do a direct dispatch to an invalid" + " DSQ in ops.select_cpu()", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&ddsp_bogus_dsq_fail) diff --git a/tools/testing/selftests/sched_ext/ddsp_vtimelocal_fail.bpf.c b/tools/testing/selftests/sched_ext/ddsp_vtimelocal_fail.bpf.c new file mode 100644 index 000000000000..dde7e7dafbfb --- /dev/null +++ b/tools/testing/selftests/sched_ext/ddsp_vtimelocal_fail.bpf.c @@ -0,0 +1,39 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + * Copyright (c) 2024 Tejun Heo <tj@kernel.org> + */ +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +UEI_DEFINE(uei); + +s32 BPF_STRUCT_OPS(ddsp_vtimelocal_fail_select_cpu, struct task_struct *p, + s32 prev_cpu, u64 wake_flags) +{ + s32 cpu = scx_bpf_pick_idle_cpu(p->cpus_ptr, 0); + + if (cpu >= 0) { + /* Shouldn't be allowed to vtime dispatch to a builtin DSQ. */ + scx_bpf_dispatch_vtime(p, SCX_DSQ_LOCAL, SCX_SLICE_DFL, + p->scx.dsq_vtime, 0); + return cpu; + } + + return prev_cpu; +} + +void BPF_STRUCT_OPS(ddsp_vtimelocal_fail_exit, struct scx_exit_info *ei) +{ + UEI_RECORD(uei, ei); +} + +SEC(".struct_ops.link") +struct sched_ext_ops ddsp_vtimelocal_fail_ops = { + .select_cpu = ddsp_vtimelocal_fail_select_cpu, + .exit = ddsp_vtimelocal_fail_exit, + .name = "ddsp_vtimelocal_fail", + .timeout_ms = 1000U, +}; diff --git a/tools/testing/selftests/sched_ext/ddsp_vtimelocal_fail.c b/tools/testing/selftests/sched_ext/ddsp_vtimelocal_fail.c new file mode 100644 index 000000000000..abafee587cd6 --- /dev/null +++ b/tools/testing/selftests/sched_ext/ddsp_vtimelocal_fail.c @@ -0,0 +1,56 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + * Copyright (c) 2024 Tejun Heo <tj@kernel.org> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <unistd.h> +#include "ddsp_vtimelocal_fail.bpf.skel.h" +#include "scx_test.h" + +static enum scx_test_status setup(void **ctx) +{ + struct ddsp_vtimelocal_fail *skel; + + skel = ddsp_vtimelocal_fail__open_and_load(); + SCX_FAIL_IF(!skel, "Failed to open and load skel"); + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct ddsp_vtimelocal_fail *skel = ctx; + struct bpf_link *link; + + link = bpf_map__attach_struct_ops(skel->maps.ddsp_vtimelocal_fail_ops); + SCX_FAIL_IF(!link, "Failed to attach struct_ops"); + + sleep(1); + + SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_ERROR)); + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct ddsp_vtimelocal_fail *skel = ctx; + + ddsp_vtimelocal_fail__destroy(skel); +} + +struct scx_test ddsp_vtimelocal_fail = { + .name = "ddsp_vtimelocal_fail", + .description = "Verify we gracefully fail, and fall back to using a " + "built-in DSQ, if we do a direct vtime dispatch to a " + "built-in DSQ from DSQ in ops.select_cpu()", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&ddsp_vtimelocal_fail) diff --git a/tools/testing/selftests/sched_ext/dsp_local_on.bpf.c b/tools/testing/selftests/sched_ext/dsp_local_on.bpf.c new file mode 100644 index 000000000000..efb4672decb4 --- /dev/null +++ b/tools/testing/selftests/sched_ext/dsp_local_on.bpf.c @@ -0,0 +1,65 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; +const volatile s32 nr_cpus; + +UEI_DEFINE(uei); + +struct { + __uint(type, BPF_MAP_TYPE_QUEUE); + __uint(max_entries, 8192); + __type(value, s32); +} queue SEC(".maps"); + +s32 BPF_STRUCT_OPS(dsp_local_on_select_cpu, struct task_struct *p, + s32 prev_cpu, u64 wake_flags) +{ + return prev_cpu; +} + +void BPF_STRUCT_OPS(dsp_local_on_enqueue, struct task_struct *p, + u64 enq_flags) +{ + s32 pid = p->pid; + + if (bpf_map_push_elem(&queue, &pid, 0)) + scx_bpf_error("Failed to enqueue %s[%d]", p->comm, p->pid); +} + +void BPF_STRUCT_OPS(dsp_local_on_dispatch, s32 cpu, struct task_struct *prev) +{ + s32 pid, target; + struct task_struct *p; + + if (bpf_map_pop_elem(&queue, &pid)) + return; + + p = bpf_task_from_pid(pid); + if (!p) + return; + + target = bpf_get_prandom_u32() % nr_cpus; + + scx_bpf_dispatch(p, SCX_DSQ_LOCAL_ON | target, SCX_SLICE_DFL, 0); + bpf_task_release(p); +} + +void BPF_STRUCT_OPS(dsp_local_on_exit, struct scx_exit_info *ei) +{ + UEI_RECORD(uei, ei); +} + +SEC(".struct_ops.link") +struct sched_ext_ops dsp_local_on_ops = { + .select_cpu = dsp_local_on_select_cpu, + .enqueue = dsp_local_on_enqueue, + .dispatch = dsp_local_on_dispatch, + .exit = dsp_local_on_exit, + .name = "dsp_local_on", + .timeout_ms = 1000U, +}; diff --git a/tools/testing/selftests/sched_ext/dsp_local_on.c b/tools/testing/selftests/sched_ext/dsp_local_on.c new file mode 100644 index 000000000000..472851b56854 --- /dev/null +++ b/tools/testing/selftests/sched_ext/dsp_local_on.c @@ -0,0 +1,58 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <unistd.h> +#include "dsp_local_on.bpf.skel.h" +#include "scx_test.h" + +static enum scx_test_status setup(void **ctx) +{ + struct dsp_local_on *skel; + + skel = dsp_local_on__open(); + SCX_FAIL_IF(!skel, "Failed to open"); + + skel->rodata->nr_cpus = libbpf_num_possible_cpus(); + SCX_FAIL_IF(dsp_local_on__load(skel), "Failed to load skel"); + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct dsp_local_on *skel = ctx; + struct bpf_link *link; + + link = bpf_map__attach_struct_ops(skel->maps.dsp_local_on_ops); + SCX_FAIL_IF(!link, "Failed to attach struct_ops"); + + /* Just sleeping is fine, plenty of scheduling events happening */ + sleep(1); + + SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_ERROR)); + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct dsp_local_on *skel = ctx; + + dsp_local_on__destroy(skel); +} + +struct scx_test dsp_local_on = { + .name = "dsp_local_on", + .description = "Verify we can directly dispatch tasks to a local DSQs " + "from osp.dispatch()", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&dsp_local_on) diff --git a/tools/testing/selftests/sched_ext/enq_last_no_enq_fails.bpf.c b/tools/testing/selftests/sched_ext/enq_last_no_enq_fails.bpf.c new file mode 100644 index 000000000000..b0b99531d5d5 --- /dev/null +++ b/tools/testing/selftests/sched_ext/enq_last_no_enq_fails.bpf.c @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * A scheduler that validates the behavior of direct dispatching with a default + * select_cpu implementation. + * + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +SEC(".struct_ops.link") +struct sched_ext_ops enq_last_no_enq_fails_ops = { + .name = "enq_last_no_enq_fails", + /* Need to define ops.enqueue() with SCX_OPS_ENQ_LAST */ + .flags = SCX_OPS_ENQ_LAST, + .timeout_ms = 1000U, +}; diff --git a/tools/testing/selftests/sched_ext/enq_last_no_enq_fails.c b/tools/testing/selftests/sched_ext/enq_last_no_enq_fails.c new file mode 100644 index 000000000000..2a3eda5e2c0b --- /dev/null +++ b/tools/testing/selftests/sched_ext/enq_last_no_enq_fails.c @@ -0,0 +1,60 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "enq_last_no_enq_fails.bpf.skel.h" +#include "scx_test.h" + +static enum scx_test_status setup(void **ctx) +{ + struct enq_last_no_enq_fails *skel; + + skel = enq_last_no_enq_fails__open_and_load(); + if (!skel) { + SCX_ERR("Failed to open and load skel"); + return SCX_TEST_FAIL; + } + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct enq_last_no_enq_fails *skel = ctx; + struct bpf_link *link; + + link = bpf_map__attach_struct_ops(skel->maps.enq_last_no_enq_fails_ops); + if (link) { + SCX_ERR("Incorrectly succeeded in to attaching scheduler"); + return SCX_TEST_FAIL; + } + + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct enq_last_no_enq_fails *skel = ctx; + + enq_last_no_enq_fails__destroy(skel); +} + +struct scx_test enq_last_no_enq_fails = { + .name = "enq_last_no_enq_fails", + .description = "Verify we fail to load a scheduler if we specify " + "the SCX_OPS_ENQ_LAST flag without defining " + "ops.enqueue()", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&enq_last_no_enq_fails) diff --git a/tools/testing/selftests/sched_ext/enq_select_cpu_fails.bpf.c b/tools/testing/selftests/sched_ext/enq_select_cpu_fails.bpf.c new file mode 100644 index 000000000000..b3dfc1033cd6 --- /dev/null +++ b/tools/testing/selftests/sched_ext/enq_select_cpu_fails.bpf.c @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +/* Manually specify the signature until the kfunc is added to the scx repo. */ +s32 scx_bpf_select_cpu_dfl(struct task_struct *p, s32 prev_cpu, u64 wake_flags, + bool *found) __ksym; + +s32 BPF_STRUCT_OPS(enq_select_cpu_fails_select_cpu, struct task_struct *p, + s32 prev_cpu, u64 wake_flags) +{ + return prev_cpu; +} + +void BPF_STRUCT_OPS(enq_select_cpu_fails_enqueue, struct task_struct *p, + u64 enq_flags) +{ + /* + * Need to initialize the variable or the verifier will fail to load. + * Improving these semantics is actively being worked on. + */ + bool found = false; + + /* Can only call from ops.select_cpu() */ + scx_bpf_select_cpu_dfl(p, 0, 0, &found); + + scx_bpf_dispatch(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, enq_flags); +} + +SEC(".struct_ops.link") +struct sched_ext_ops enq_select_cpu_fails_ops = { + .select_cpu = enq_select_cpu_fails_select_cpu, + .enqueue = enq_select_cpu_fails_enqueue, + .name = "enq_select_cpu_fails", + .timeout_ms = 1000U, +}; diff --git a/tools/testing/selftests/sched_ext/enq_select_cpu_fails.c b/tools/testing/selftests/sched_ext/enq_select_cpu_fails.c new file mode 100644 index 000000000000..dd1350e5f002 --- /dev/null +++ b/tools/testing/selftests/sched_ext/enq_select_cpu_fails.c @@ -0,0 +1,61 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "enq_select_cpu_fails.bpf.skel.h" +#include "scx_test.h" + +static enum scx_test_status setup(void **ctx) +{ + struct enq_select_cpu_fails *skel; + + skel = enq_select_cpu_fails__open_and_load(); + if (!skel) { + SCX_ERR("Failed to open and load skel"); + return SCX_TEST_FAIL; + } + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct enq_select_cpu_fails *skel = ctx; + struct bpf_link *link; + + link = bpf_map__attach_struct_ops(skel->maps.enq_select_cpu_fails_ops); + if (!link) { + SCX_ERR("Failed to attach scheduler"); + return SCX_TEST_FAIL; + } + + sleep(1); + + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct enq_select_cpu_fails *skel = ctx; + + enq_select_cpu_fails__destroy(skel); +} + +struct scx_test enq_select_cpu_fails = { + .name = "enq_select_cpu_fails", + .description = "Verify we fail to call scx_bpf_select_cpu_dfl() " + "from ops.enqueue()", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&enq_select_cpu_fails) diff --git a/tools/testing/selftests/sched_ext/exit.bpf.c b/tools/testing/selftests/sched_ext/exit.bpf.c new file mode 100644 index 000000000000..ae12ddaac921 --- /dev/null +++ b/tools/testing/selftests/sched_ext/exit.bpf.c @@ -0,0 +1,84 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +#include "exit_test.h" + +const volatile int exit_point; +UEI_DEFINE(uei); + +#define EXIT_CLEANLY() scx_bpf_exit(exit_point, "%d", exit_point) + +s32 BPF_STRUCT_OPS(exit_select_cpu, struct task_struct *p, + s32 prev_cpu, u64 wake_flags) +{ + bool found; + + if (exit_point == EXIT_SELECT_CPU) + EXIT_CLEANLY(); + + return scx_bpf_select_cpu_dfl(p, prev_cpu, wake_flags, &found); +} + +void BPF_STRUCT_OPS(exit_enqueue, struct task_struct *p, u64 enq_flags) +{ + if (exit_point == EXIT_ENQUEUE) + EXIT_CLEANLY(); + + scx_bpf_dispatch(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, enq_flags); +} + +void BPF_STRUCT_OPS(exit_dispatch, s32 cpu, struct task_struct *p) +{ + if (exit_point == EXIT_DISPATCH) + EXIT_CLEANLY(); + + scx_bpf_consume(SCX_DSQ_GLOBAL); +} + +void BPF_STRUCT_OPS(exit_enable, struct task_struct *p) +{ + if (exit_point == EXIT_ENABLE) + EXIT_CLEANLY(); +} + +s32 BPF_STRUCT_OPS(exit_init_task, struct task_struct *p, + struct scx_init_task_args *args) +{ + if (exit_point == EXIT_INIT_TASK) + EXIT_CLEANLY(); + + return 0; +} + +void BPF_STRUCT_OPS(exit_exit, struct scx_exit_info *ei) +{ + UEI_RECORD(uei, ei); +} + +s32 BPF_STRUCT_OPS_SLEEPABLE(exit_init) +{ + if (exit_point == EXIT_INIT) + EXIT_CLEANLY(); + + return 0; +} + +SEC(".struct_ops.link") +struct sched_ext_ops exit_ops = { + .select_cpu = exit_select_cpu, + .enqueue = exit_enqueue, + .dispatch = exit_dispatch, + .init_task = exit_init_task, + .enable = exit_enable, + .exit = exit_exit, + .init = exit_init, + .name = "exit", + .timeout_ms = 1000U, +}; diff --git a/tools/testing/selftests/sched_ext/exit.c b/tools/testing/selftests/sched_ext/exit.c new file mode 100644 index 000000000000..31bcd06e21cd --- /dev/null +++ b/tools/testing/selftests/sched_ext/exit.c @@ -0,0 +1,55 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ +#include <bpf/bpf.h> +#include <sched.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "exit.bpf.skel.h" +#include "scx_test.h" + +#include "exit_test.h" + +static enum scx_test_status run(void *ctx) +{ + enum exit_test_case tc; + + for (tc = 0; tc < NUM_EXITS; tc++) { + struct exit *skel; + struct bpf_link *link; + char buf[16]; + + skel = exit__open(); + skel->rodata->exit_point = tc; + exit__load(skel); + link = bpf_map__attach_struct_ops(skel->maps.exit_ops); + if (!link) { + SCX_ERR("Failed to attach scheduler"); + exit__destroy(skel); + return SCX_TEST_FAIL; + } + + /* Assumes uei.kind is written last */ + while (skel->data->uei.kind == EXIT_KIND(SCX_EXIT_NONE)) + sched_yield(); + + SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_UNREG_BPF)); + SCX_EQ(skel->data->uei.exit_code, tc); + sprintf(buf, "%d", tc); + SCX_ASSERT(!strcmp(skel->data->uei.msg, buf)); + bpf_link__destroy(link); + exit__destroy(skel); + } + + return SCX_TEST_PASS; +} + +struct scx_test exit_test = { + .name = "exit", + .description = "Verify we can cleanly exit a scheduler in multiple places", + .run = run, +}; +REGISTER_SCX_TEST(&exit_test) diff --git a/tools/testing/selftests/sched_ext/exit_test.h b/tools/testing/selftests/sched_ext/exit_test.h new file mode 100644 index 000000000000..94f0268b9cb8 --- /dev/null +++ b/tools/testing/selftests/sched_ext/exit_test.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ + +#ifndef __EXIT_TEST_H__ +#define __EXIT_TEST_H__ + +enum exit_test_case { + EXIT_SELECT_CPU, + EXIT_ENQUEUE, + EXIT_DISPATCH, + EXIT_ENABLE, + EXIT_INIT_TASK, + EXIT_INIT, + NUM_EXITS, +}; + +#endif // # __EXIT_TEST_H__ diff --git a/tools/testing/selftests/sched_ext/hotplug.bpf.c b/tools/testing/selftests/sched_ext/hotplug.bpf.c new file mode 100644 index 000000000000..8f2601db39f3 --- /dev/null +++ b/tools/testing/selftests/sched_ext/hotplug.bpf.c @@ -0,0 +1,61 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +#include "hotplug_test.h" + +UEI_DEFINE(uei); + +void BPF_STRUCT_OPS(hotplug_exit, struct scx_exit_info *ei) +{ + UEI_RECORD(uei, ei); +} + +static void exit_from_hotplug(s32 cpu, bool onlining) +{ + /* + * Ignored, just used to verify that we can invoke blocking kfuncs + * from the hotplug path. + */ + scx_bpf_create_dsq(0, -1); + + s64 code = SCX_ECODE_ACT_RESTART | HOTPLUG_EXIT_RSN; + + if (onlining) + code |= HOTPLUG_ONLINING; + + scx_bpf_exit(code, "hotplug event detected (%d going %s)", cpu, + onlining ? "online" : "offline"); +} + +void BPF_STRUCT_OPS_SLEEPABLE(hotplug_cpu_online, s32 cpu) +{ + exit_from_hotplug(cpu, true); +} + +void BPF_STRUCT_OPS_SLEEPABLE(hotplug_cpu_offline, s32 cpu) +{ + exit_from_hotplug(cpu, false); +} + +SEC(".struct_ops.link") +struct sched_ext_ops hotplug_cb_ops = { + .cpu_online = hotplug_cpu_online, + .cpu_offline = hotplug_cpu_offline, + .exit = hotplug_exit, + .name = "hotplug_cbs", + .timeout_ms = 1000U, +}; + +SEC(".struct_ops.link") +struct sched_ext_ops hotplug_nocb_ops = { + .exit = hotplug_exit, + .name = "hotplug_nocbs", + .timeout_ms = 1000U, +}; diff --git a/tools/testing/selftests/sched_ext/hotplug.c b/tools/testing/selftests/sched_ext/hotplug.c new file mode 100644 index 000000000000..87bf220b1bce --- /dev/null +++ b/tools/testing/selftests/sched_ext/hotplug.c @@ -0,0 +1,168 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ +#include <bpf/bpf.h> +#include <sched.h> +#include <scx/common.h> +#include <sched.h> +#include <sys/wait.h> +#include <unistd.h> + +#include "hotplug_test.h" +#include "hotplug.bpf.skel.h" +#include "scx_test.h" +#include "util.h" + +const char *online_path = "/sys/devices/system/cpu/cpu1/online"; + +static bool is_cpu_online(void) +{ + return file_read_long(online_path) > 0; +} + +static void toggle_online_status(bool online) +{ + long val = online ? 1 : 0; + int ret; + + ret = file_write_long(online_path, val); + if (ret != 0) + fprintf(stderr, "Failed to bring CPU %s (%s)", + online ? "online" : "offline", strerror(errno)); +} + +static enum scx_test_status setup(void **ctx) +{ + if (!is_cpu_online()) + return SCX_TEST_SKIP; + + return SCX_TEST_PASS; +} + +static enum scx_test_status test_hotplug(bool onlining, bool cbs_defined) +{ + struct hotplug *skel; + struct bpf_link *link; + long kind, code; + + SCX_ASSERT(is_cpu_online()); + + skel = hotplug__open_and_load(); + SCX_ASSERT(skel); + + /* Testing the offline -> online path, so go offline before starting */ + if (onlining) + toggle_online_status(0); + + if (cbs_defined) { + kind = SCX_KIND_VAL(SCX_EXIT_UNREG_BPF); + code = SCX_ECODE_VAL(SCX_ECODE_ACT_RESTART) | HOTPLUG_EXIT_RSN; + if (onlining) + code |= HOTPLUG_ONLINING; + } else { + kind = SCX_KIND_VAL(SCX_EXIT_UNREG_KERN); + code = SCX_ECODE_VAL(SCX_ECODE_ACT_RESTART) | + SCX_ECODE_VAL(SCX_ECODE_RSN_HOTPLUG); + } + + if (cbs_defined) + link = bpf_map__attach_struct_ops(skel->maps.hotplug_cb_ops); + else + link = bpf_map__attach_struct_ops(skel->maps.hotplug_nocb_ops); + + if (!link) { + SCX_ERR("Failed to attach scheduler"); + hotplug__destroy(skel); + return SCX_TEST_FAIL; + } + + toggle_online_status(onlining ? 1 : 0); + + while (!UEI_EXITED(skel, uei)) + sched_yield(); + + SCX_EQ(skel->data->uei.kind, kind); + SCX_EQ(UEI_REPORT(skel, uei), code); + + if (!onlining) + toggle_online_status(1); + + bpf_link__destroy(link); + hotplug__destroy(skel); + + return SCX_TEST_PASS; +} + +static enum scx_test_status test_hotplug_attach(void) +{ + struct hotplug *skel; + struct bpf_link *link; + enum scx_test_status status = SCX_TEST_PASS; + long kind, code; + + SCX_ASSERT(is_cpu_online()); + SCX_ASSERT(scx_hotplug_seq() > 0); + + skel = SCX_OPS_OPEN(hotplug_nocb_ops, hotplug); + SCX_ASSERT(skel); + + SCX_OPS_LOAD(skel, hotplug_nocb_ops, hotplug, uei); + + /* + * Take the CPU offline to increment the global hotplug seq, which + * should cause attach to fail due to us setting the hotplug seq above + */ + toggle_online_status(0); + link = bpf_map__attach_struct_ops(skel->maps.hotplug_nocb_ops); + + toggle_online_status(1); + + SCX_ASSERT(link); + while (!UEI_EXITED(skel, uei)) + sched_yield(); + + kind = SCX_KIND_VAL(SCX_EXIT_UNREG_KERN); + code = SCX_ECODE_VAL(SCX_ECODE_ACT_RESTART) | + SCX_ECODE_VAL(SCX_ECODE_RSN_HOTPLUG); + SCX_EQ(skel->data->uei.kind, kind); + SCX_EQ(UEI_REPORT(skel, uei), code); + + bpf_link__destroy(link); + hotplug__destroy(skel); + + return status; +} + +static enum scx_test_status run(void *ctx) +{ + +#define HP_TEST(__onlining, __cbs_defined) ({ \ + if (test_hotplug(__onlining, __cbs_defined) != SCX_TEST_PASS) \ + return SCX_TEST_FAIL; \ +}) + + HP_TEST(true, true); + HP_TEST(false, true); + HP_TEST(true, false); + HP_TEST(false, false); + +#undef HP_TEST + + return test_hotplug_attach(); +} + +static void cleanup(void *ctx) +{ + toggle_online_status(1); +} + +struct scx_test hotplug_test = { + .name = "hotplug", + .description = "Verify hotplug behavior", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&hotplug_test) diff --git a/tools/testing/selftests/sched_ext/hotplug_test.h b/tools/testing/selftests/sched_ext/hotplug_test.h new file mode 100644 index 000000000000..73d236f90787 --- /dev/null +++ b/tools/testing/selftests/sched_ext/hotplug_test.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ + +#ifndef __HOTPLUG_TEST_H__ +#define __HOTPLUG_TEST_H__ + +enum hotplug_test_flags { + HOTPLUG_EXIT_RSN = 1LLU << 0, + HOTPLUG_ONLINING = 1LLU << 1, +}; + +#endif // # __HOTPLUG_TEST_H__ diff --git a/tools/testing/selftests/sched_ext/init_enable_count.bpf.c b/tools/testing/selftests/sched_ext/init_enable_count.bpf.c new file mode 100644 index 000000000000..47ea89a626c3 --- /dev/null +++ b/tools/testing/selftests/sched_ext/init_enable_count.bpf.c @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * A scheduler that verifies that we do proper counting of init, enable, etc + * callbacks. + * + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +u64 init_task_cnt, exit_task_cnt, enable_cnt, disable_cnt; +u64 init_fork_cnt, init_transition_cnt; + +s32 BPF_STRUCT_OPS_SLEEPABLE(cnt_init_task, struct task_struct *p, + struct scx_init_task_args *args) +{ + __sync_fetch_and_add(&init_task_cnt, 1); + + if (args->fork) + __sync_fetch_and_add(&init_fork_cnt, 1); + else + __sync_fetch_and_add(&init_transition_cnt, 1); + + return 0; +} + +void BPF_STRUCT_OPS(cnt_exit_task, struct task_struct *p) +{ + __sync_fetch_and_add(&exit_task_cnt, 1); +} + +void BPF_STRUCT_OPS(cnt_enable, struct task_struct *p) +{ + __sync_fetch_and_add(&enable_cnt, 1); +} + +void BPF_STRUCT_OPS(cnt_disable, struct task_struct *p) +{ + __sync_fetch_and_add(&disable_cnt, 1); +} + +SEC(".struct_ops.link") +struct sched_ext_ops init_enable_count_ops = { + .init_task = cnt_init_task, + .exit_task = cnt_exit_task, + .enable = cnt_enable, + .disable = cnt_disable, + .name = "init_enable_count", +}; diff --git a/tools/testing/selftests/sched_ext/init_enable_count.c b/tools/testing/selftests/sched_ext/init_enable_count.c new file mode 100644 index 000000000000..97d45f1e5597 --- /dev/null +++ b/tools/testing/selftests/sched_ext/init_enable_count.c @@ -0,0 +1,166 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ +#include <stdio.h> +#include <unistd.h> +#include <sched.h> +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include "scx_test.h" +#include "init_enable_count.bpf.skel.h" + +#define SCHED_EXT 7 + +static struct init_enable_count * +open_load_prog(bool global) +{ + struct init_enable_count *skel; + + skel = init_enable_count__open(); + SCX_BUG_ON(!skel, "Failed to open skel"); + + if (!global) + skel->struct_ops.init_enable_count_ops->flags |= SCX_OPS_SWITCH_PARTIAL; + + SCX_BUG_ON(init_enable_count__load(skel), "Failed to load skel"); + + return skel; +} + +static enum scx_test_status run_test(bool global) +{ + struct init_enable_count *skel; + struct bpf_link *link; + const u32 num_children = 5, num_pre_forks = 1024; + int ret, i, status; + struct sched_param param = {}; + pid_t pids[num_pre_forks]; + + skel = open_load_prog(global); + + /* + * Fork a bunch of children before we attach the scheduler so that we + * ensure (at least in practical terms) that there are more tasks that + * transition from SCHED_OTHER -> SCHED_EXT than there are tasks that + * take the fork() path either below or in other processes. + */ + for (i = 0; i < num_pre_forks; i++) { + pids[i] = fork(); + SCX_FAIL_IF(pids[i] < 0, "Failed to fork child"); + if (pids[i] == 0) { + sleep(1); + exit(0); + } + } + + link = bpf_map__attach_struct_ops(skel->maps.init_enable_count_ops); + SCX_FAIL_IF(!link, "Failed to attach struct_ops"); + + for (i = 0; i < num_pre_forks; i++) { + SCX_FAIL_IF(waitpid(pids[i], &status, 0) != pids[i], + "Failed to wait for pre-forked child\n"); + + SCX_FAIL_IF(status != 0, "Pre-forked child %d exited with status %d\n", i, + status); + } + + bpf_link__destroy(link); + SCX_GE(skel->bss->init_task_cnt, num_pre_forks); + SCX_GE(skel->bss->exit_task_cnt, num_pre_forks); + + link = bpf_map__attach_struct_ops(skel->maps.init_enable_count_ops); + SCX_FAIL_IF(!link, "Failed to attach struct_ops"); + + /* SCHED_EXT children */ + for (i = 0; i < num_children; i++) { + pids[i] = fork(); + SCX_FAIL_IF(pids[i] < 0, "Failed to fork child"); + + if (pids[i] == 0) { + ret = sched_setscheduler(0, SCHED_EXT, ¶m); + SCX_BUG_ON(ret, "Failed to set sched to sched_ext"); + + /* + * Reset to SCHED_OTHER for half of them. Counts for + * everything should still be the same regardless, as + * ops.disable() is invoked even if a task is still on + * SCHED_EXT before it exits. + */ + if (i % 2 == 0) { + ret = sched_setscheduler(0, SCHED_OTHER, ¶m); + SCX_BUG_ON(ret, "Failed to reset sched to normal"); + } + exit(0); + } + } + for (i = 0; i < num_children; i++) { + SCX_FAIL_IF(waitpid(pids[i], &status, 0) != pids[i], + "Failed to wait for SCX child\n"); + + SCX_FAIL_IF(status != 0, "SCX child %d exited with status %d\n", i, + status); + } + + /* SCHED_OTHER children */ + for (i = 0; i < num_children; i++) { + pids[i] = fork(); + if (pids[i] == 0) + exit(0); + } + + for (i = 0; i < num_children; i++) { + SCX_FAIL_IF(waitpid(pids[i], &status, 0) != pids[i], + "Failed to wait for normal child\n"); + + SCX_FAIL_IF(status != 0, "Normal child %d exited with status %d\n", i, + status); + } + + bpf_link__destroy(link); + + SCX_GE(skel->bss->init_task_cnt, 2 * num_children); + SCX_GE(skel->bss->exit_task_cnt, 2 * num_children); + + if (global) { + SCX_GE(skel->bss->enable_cnt, 2 * num_children); + SCX_GE(skel->bss->disable_cnt, 2 * num_children); + } else { + SCX_EQ(skel->bss->enable_cnt, num_children); + SCX_EQ(skel->bss->disable_cnt, num_children); + } + /* + * We forked a ton of tasks before we attached the scheduler above, so + * this should be fine. Technically it could be flaky if a ton of forks + * are happening at the same time in other processes, but that should + * be exceedingly unlikely. + */ + SCX_GT(skel->bss->init_transition_cnt, skel->bss->init_fork_cnt); + SCX_GE(skel->bss->init_fork_cnt, 2 * num_children); + + init_enable_count__destroy(skel); + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + enum scx_test_status status; + + status = run_test(true); + if (status != SCX_TEST_PASS) + return status; + + return run_test(false); +} + +struct scx_test init_enable_count = { + .name = "init_enable_count", + .description = "Verify we do the correct amount of counting of init, " + "enable, etc callbacks.", + .run = run, +}; +REGISTER_SCX_TEST(&init_enable_count) diff --git a/tools/testing/selftests/sched_ext/maximal.bpf.c b/tools/testing/selftests/sched_ext/maximal.bpf.c new file mode 100644 index 000000000000..44612fdaf399 --- /dev/null +++ b/tools/testing/selftests/sched_ext/maximal.bpf.c @@ -0,0 +1,132 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * A scheduler with every callback defined. + * + * This scheduler defines every callback. + * + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +s32 BPF_STRUCT_OPS(maximal_select_cpu, struct task_struct *p, s32 prev_cpu, + u64 wake_flags) +{ + return prev_cpu; +} + +void BPF_STRUCT_OPS(maximal_enqueue, struct task_struct *p, u64 enq_flags) +{ + scx_bpf_dispatch(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, enq_flags); +} + +void BPF_STRUCT_OPS(maximal_dequeue, struct task_struct *p, u64 deq_flags) +{} + +void BPF_STRUCT_OPS(maximal_dispatch, s32 cpu, struct task_struct *prev) +{ + scx_bpf_consume(SCX_DSQ_GLOBAL); +} + +void BPF_STRUCT_OPS(maximal_runnable, struct task_struct *p, u64 enq_flags) +{} + +void BPF_STRUCT_OPS(maximal_running, struct task_struct *p) +{} + +void BPF_STRUCT_OPS(maximal_stopping, struct task_struct *p, bool runnable) +{} + +void BPF_STRUCT_OPS(maximal_quiescent, struct task_struct *p, u64 deq_flags) +{} + +bool BPF_STRUCT_OPS(maximal_yield, struct task_struct *from, + struct task_struct *to) +{ + return false; +} + +bool BPF_STRUCT_OPS(maximal_core_sched_before, struct task_struct *a, + struct task_struct *b) +{ + return false; +} + +void BPF_STRUCT_OPS(maximal_set_weight, struct task_struct *p, u32 weight) +{} + +void BPF_STRUCT_OPS(maximal_set_cpumask, struct task_struct *p, + const struct cpumask *cpumask) +{} + +void BPF_STRUCT_OPS(maximal_update_idle, s32 cpu, bool idle) +{} + +void BPF_STRUCT_OPS(maximal_cpu_acquire, s32 cpu, + struct scx_cpu_acquire_args *args) +{} + +void BPF_STRUCT_OPS(maximal_cpu_release, s32 cpu, + struct scx_cpu_release_args *args) +{} + +void BPF_STRUCT_OPS(maximal_cpu_online, s32 cpu) +{} + +void BPF_STRUCT_OPS(maximal_cpu_offline, s32 cpu) +{} + +s32 BPF_STRUCT_OPS(maximal_init_task, struct task_struct *p, + struct scx_init_task_args *args) +{ + return 0; +} + +void BPF_STRUCT_OPS(maximal_enable, struct task_struct *p) +{} + +void BPF_STRUCT_OPS(maximal_exit_task, struct task_struct *p, + struct scx_exit_task_args *args) +{} + +void BPF_STRUCT_OPS(maximal_disable, struct task_struct *p) +{} + +s32 BPF_STRUCT_OPS_SLEEPABLE(maximal_init) +{ + return 0; +} + +void BPF_STRUCT_OPS(maximal_exit, struct scx_exit_info *info) +{} + +SEC(".struct_ops.link") +struct sched_ext_ops maximal_ops = { + .select_cpu = maximal_select_cpu, + .enqueue = maximal_enqueue, + .dequeue = maximal_dequeue, + .dispatch = maximal_dispatch, + .runnable = maximal_runnable, + .running = maximal_running, + .stopping = maximal_stopping, + .quiescent = maximal_quiescent, + .yield = maximal_yield, + .core_sched_before = maximal_core_sched_before, + .set_weight = maximal_set_weight, + .set_cpumask = maximal_set_cpumask, + .update_idle = maximal_update_idle, + .cpu_acquire = maximal_cpu_acquire, + .cpu_release = maximal_cpu_release, + .cpu_online = maximal_cpu_online, + .cpu_offline = maximal_cpu_offline, + .init_task = maximal_init_task, + .enable = maximal_enable, + .exit_task = maximal_exit_task, + .disable = maximal_disable, + .init = maximal_init, + .exit = maximal_exit, + .name = "maximal", +}; diff --git a/tools/testing/selftests/sched_ext/maximal.c b/tools/testing/selftests/sched_ext/maximal.c new file mode 100644 index 000000000000..f38fc973c380 --- /dev/null +++ b/tools/testing/selftests/sched_ext/maximal.c @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "maximal.bpf.skel.h" +#include "scx_test.h" + +static enum scx_test_status setup(void **ctx) +{ + struct maximal *skel; + + skel = maximal__open_and_load(); + SCX_FAIL_IF(!skel, "Failed to open and load skel"); + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct maximal *skel = ctx; + struct bpf_link *link; + + link = bpf_map__attach_struct_ops(skel->maps.maximal_ops); + SCX_FAIL_IF(!link, "Failed to attach scheduler"); + + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct maximal *skel = ctx; + + maximal__destroy(skel); +} + +struct scx_test maximal = { + .name = "maximal", + .description = "Verify we can load a scheduler with every callback defined", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&maximal) diff --git a/tools/testing/selftests/sched_ext/maybe_null.bpf.c b/tools/testing/selftests/sched_ext/maybe_null.bpf.c new file mode 100644 index 000000000000..27d0f386acfb --- /dev/null +++ b/tools/testing/selftests/sched_ext/maybe_null.bpf.c @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +u64 vtime_test; + +void BPF_STRUCT_OPS(maybe_null_running, struct task_struct *p) +{} + +void BPF_STRUCT_OPS(maybe_null_success_dispatch, s32 cpu, struct task_struct *p) +{ + if (p != NULL) + vtime_test = p->scx.dsq_vtime; +} + +bool BPF_STRUCT_OPS(maybe_null_success_yield, struct task_struct *from, + struct task_struct *to) +{ + if (to) + bpf_printk("Yielding to %s[%d]", to->comm, to->pid); + + return false; +} + +SEC(".struct_ops.link") +struct sched_ext_ops maybe_null_success = { + .dispatch = maybe_null_success_dispatch, + .yield = maybe_null_success_yield, + .enable = maybe_null_running, + .name = "minimal", +}; diff --git a/tools/testing/selftests/sched_ext/maybe_null.c b/tools/testing/selftests/sched_ext/maybe_null.c new file mode 100644 index 000000000000..31cfafb0cf65 --- /dev/null +++ b/tools/testing/selftests/sched_ext/maybe_null.c @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "maybe_null.bpf.skel.h" +#include "maybe_null_fail_dsp.bpf.skel.h" +#include "maybe_null_fail_yld.bpf.skel.h" +#include "scx_test.h" + +static enum scx_test_status run(void *ctx) +{ + struct maybe_null *skel; + struct maybe_null_fail_dsp *fail_dsp; + struct maybe_null_fail_yld *fail_yld; + + skel = maybe_null__open_and_load(); + if (!skel) { + SCX_ERR("Failed to open and load maybe_null skel"); + return SCX_TEST_FAIL; + } + maybe_null__destroy(skel); + + fail_dsp = maybe_null_fail_dsp__open_and_load(); + if (fail_dsp) { + maybe_null_fail_dsp__destroy(fail_dsp); + SCX_ERR("Should failed to open and load maybe_null_fail_dsp skel"); + return SCX_TEST_FAIL; + } + + fail_yld = maybe_null_fail_yld__open_and_load(); + if (fail_yld) { + maybe_null_fail_yld__destroy(fail_yld); + SCX_ERR("Should failed to open and load maybe_null_fail_yld skel"); + return SCX_TEST_FAIL; + } + + return SCX_TEST_PASS; +} + +struct scx_test maybe_null = { + .name = "maybe_null", + .description = "Verify if PTR_MAYBE_NULL work for .dispatch", + .run = run, +}; +REGISTER_SCX_TEST(&maybe_null) diff --git a/tools/testing/selftests/sched_ext/maybe_null_fail_dsp.bpf.c b/tools/testing/selftests/sched_ext/maybe_null_fail_dsp.bpf.c new file mode 100644 index 000000000000..c0641050271d --- /dev/null +++ b/tools/testing/selftests/sched_ext/maybe_null_fail_dsp.bpf.c @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +u64 vtime_test; + +void BPF_STRUCT_OPS(maybe_null_running, struct task_struct *p) +{} + +void BPF_STRUCT_OPS(maybe_null_fail_dispatch, s32 cpu, struct task_struct *p) +{ + vtime_test = p->scx.dsq_vtime; +} + +SEC(".struct_ops.link") +struct sched_ext_ops maybe_null_fail = { + .dispatch = maybe_null_fail_dispatch, + .enable = maybe_null_running, + .name = "maybe_null_fail_dispatch", +}; diff --git a/tools/testing/selftests/sched_ext/maybe_null_fail_yld.bpf.c b/tools/testing/selftests/sched_ext/maybe_null_fail_yld.bpf.c new file mode 100644 index 000000000000..3c1740028e3b --- /dev/null +++ b/tools/testing/selftests/sched_ext/maybe_null_fail_yld.bpf.c @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +u64 vtime_test; + +void BPF_STRUCT_OPS(maybe_null_running, struct task_struct *p) +{} + +bool BPF_STRUCT_OPS(maybe_null_fail_yield, struct task_struct *from, + struct task_struct *to) +{ + bpf_printk("Yielding to %s[%d]", to->comm, to->pid); + + return false; +} + +SEC(".struct_ops.link") +struct sched_ext_ops maybe_null_fail = { + .yield = maybe_null_fail_yield, + .enable = maybe_null_running, + .name = "maybe_null_fail_yield", +}; diff --git a/tools/testing/selftests/sched_ext/minimal.bpf.c b/tools/testing/selftests/sched_ext/minimal.bpf.c new file mode 100644 index 000000000000..6a7eccef0104 --- /dev/null +++ b/tools/testing/selftests/sched_ext/minimal.bpf.c @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * A completely minimal scheduler. + * + * This scheduler defines the absolute minimal set of struct sched_ext_ops + * fields: its name. It should _not_ fail to be loaded, and can be used to + * exercise the default scheduling paths in ext.c. + * + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +SEC(".struct_ops.link") +struct sched_ext_ops minimal_ops = { + .name = "minimal", +}; diff --git a/tools/testing/selftests/sched_ext/minimal.c b/tools/testing/selftests/sched_ext/minimal.c new file mode 100644 index 000000000000..6c5db8ebbf8a --- /dev/null +++ b/tools/testing/selftests/sched_ext/minimal.c @@ -0,0 +1,58 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "minimal.bpf.skel.h" +#include "scx_test.h" + +static enum scx_test_status setup(void **ctx) +{ + struct minimal *skel; + + skel = minimal__open_and_load(); + if (!skel) { + SCX_ERR("Failed to open and load skel"); + return SCX_TEST_FAIL; + } + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct minimal *skel = ctx; + struct bpf_link *link; + + link = bpf_map__attach_struct_ops(skel->maps.minimal_ops); + if (!link) { + SCX_ERR("Failed to attach scheduler"); + return SCX_TEST_FAIL; + } + + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct minimal *skel = ctx; + + minimal__destroy(skel); +} + +struct scx_test minimal = { + .name = "minimal", + .description = "Verify we can load a fully minimal scheduler", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&minimal) diff --git a/tools/testing/selftests/sched_ext/prog_run.bpf.c b/tools/testing/selftests/sched_ext/prog_run.bpf.c new file mode 100644 index 000000000000..fd2c8f12af16 --- /dev/null +++ b/tools/testing/selftests/sched_ext/prog_run.bpf.c @@ -0,0 +1,32 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * A scheduler that validates that we can invoke sched_ext kfuncs in + * BPF_PROG_TYPE_SYSCALL programs. + * + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ + +#include <scx/common.bpf.h> + +UEI_DEFINE(uei); + +char _license[] SEC("license") = "GPL"; + +SEC("syscall") +int BPF_PROG(prog_run_syscall) +{ + scx_bpf_exit(0xdeadbeef, "Exited from PROG_RUN"); + return 0; +} + +void BPF_STRUCT_OPS(prog_run_exit, struct scx_exit_info *ei) +{ + UEI_RECORD(uei, ei); +} + +SEC(".struct_ops.link") +struct sched_ext_ops prog_run_ops = { + .exit = prog_run_exit, + .name = "prog_run", +}; diff --git a/tools/testing/selftests/sched_ext/prog_run.c b/tools/testing/selftests/sched_ext/prog_run.c new file mode 100644 index 000000000000..3cd57ef8daaa --- /dev/null +++ b/tools/testing/selftests/sched_ext/prog_run.c @@ -0,0 +1,78 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ +#include <bpf/bpf.h> +#include <sched.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "prog_run.bpf.skel.h" +#include "scx_test.h" + +static enum scx_test_status setup(void **ctx) +{ + struct prog_run *skel; + + skel = prog_run__open_and_load(); + if (!skel) { + SCX_ERR("Failed to open and load skel"); + return SCX_TEST_FAIL; + } + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct prog_run *skel = ctx; + struct bpf_link *link; + int prog_fd, err = 0; + + prog_fd = bpf_program__fd(skel->progs.prog_run_syscall); + if (prog_fd < 0) { + SCX_ERR("Failed to get BPF_PROG_RUN prog"); + return SCX_TEST_FAIL; + } + + LIBBPF_OPTS(bpf_test_run_opts, topts); + + link = bpf_map__attach_struct_ops(skel->maps.prog_run_ops); + if (!link) { + SCX_ERR("Failed to attach scheduler"); + close(prog_fd); + return SCX_TEST_FAIL; + } + + err = bpf_prog_test_run_opts(prog_fd, &topts); + SCX_EQ(err, 0); + + /* Assumes uei.kind is written last */ + while (skel->data->uei.kind == EXIT_KIND(SCX_EXIT_NONE)) + sched_yield(); + + SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_UNREG_BPF)); + SCX_EQ(skel->data->uei.exit_code, 0xdeadbeef); + close(prog_fd); + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct prog_run *skel = ctx; + + prog_run__destroy(skel); +} + +struct scx_test prog_run = { + .name = "prog_run", + .description = "Verify we can call into a scheduler with BPF_PROG_RUN, and invoke kfuncs", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&prog_run) diff --git a/tools/testing/selftests/sched_ext/reload_loop.c b/tools/testing/selftests/sched_ext/reload_loop.c new file mode 100644 index 000000000000..5cfba2d6e056 --- /dev/null +++ b/tools/testing/selftests/sched_ext/reload_loop.c @@ -0,0 +1,75 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ +#include <bpf/bpf.h> +#include <pthread.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "maximal.bpf.skel.h" +#include "scx_test.h" + +static struct maximal *skel; +static pthread_t threads[2]; + +bool force_exit = false; + +static enum scx_test_status setup(void **ctx) +{ + skel = maximal__open_and_load(); + if (!skel) { + SCX_ERR("Failed to open and load skel"); + return SCX_TEST_FAIL; + } + + return SCX_TEST_PASS; +} + +static void *do_reload_loop(void *arg) +{ + u32 i; + + for (i = 0; i < 1024 && !force_exit; i++) { + struct bpf_link *link; + + link = bpf_map__attach_struct_ops(skel->maps.maximal_ops); + if (link) + bpf_link__destroy(link); + } + + return NULL; +} + +static enum scx_test_status run(void *ctx) +{ + int err; + void *ret; + + err = pthread_create(&threads[0], NULL, do_reload_loop, NULL); + SCX_FAIL_IF(err, "Failed to create thread 0"); + + err = pthread_create(&threads[1], NULL, do_reload_loop, NULL); + SCX_FAIL_IF(err, "Failed to create thread 1"); + + SCX_FAIL_IF(pthread_join(threads[0], &ret), "thread 0 failed"); + SCX_FAIL_IF(pthread_join(threads[1], &ret), "thread 1 failed"); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + force_exit = true; + maximal__destroy(skel); +} + +struct scx_test reload_loop = { + .name = "reload_loop", + .description = "Stress test loading and unloading schedulers repeatedly in a tight loop", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&reload_loop) diff --git a/tools/testing/selftests/sched_ext/runner.c b/tools/testing/selftests/sched_ext/runner.c new file mode 100644 index 000000000000..eab48c7ff309 --- /dev/null +++ b/tools/testing/selftests/sched_ext/runner.c @@ -0,0 +1,201 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + * Copyright (c) 2024 Tejun Heo <tj@kernel.org> + */ +#include <stdio.h> +#include <unistd.h> +#include <signal.h> +#include <libgen.h> +#include <bpf/bpf.h> +#include "scx_test.h" + +const char help_fmt[] = +"The runner for sched_ext tests.\n" +"\n" +"The runner is statically linked against all testcases, and runs them all serially.\n" +"It's required for the testcases to be serial, as only a single host-wide sched_ext\n" +"scheduler may be loaded at any given time." +"\n" +"Usage: %s [-t TEST] [-h]\n" +"\n" +" -t TEST Only run tests whose name includes this string\n" +" -s Include print output for skipped tests\n" +" -q Don't print the test descriptions during run\n" +" -h Display this help and exit\n"; + +static volatile int exit_req; +static bool quiet, print_skipped; + +#define MAX_SCX_TESTS 2048 + +static struct scx_test __scx_tests[MAX_SCX_TESTS]; +static unsigned __scx_num_tests = 0; + +static void sigint_handler(int simple) +{ + exit_req = 1; +} + +static void print_test_preamble(const struct scx_test *test, bool quiet) +{ + printf("===== START =====\n"); + printf("TEST: %s\n", test->name); + if (!quiet) + printf("DESCRIPTION: %s\n", test->description); + printf("OUTPUT:\n"); +} + +static const char *status_to_result(enum scx_test_status status) +{ + switch (status) { + case SCX_TEST_PASS: + case SCX_TEST_SKIP: + return "ok"; + case SCX_TEST_FAIL: + return "not ok"; + default: + return "<UNKNOWN>"; + } +} + +static void print_test_result(const struct scx_test *test, + enum scx_test_status status, + unsigned int testnum) +{ + const char *result = status_to_result(status); + const char *directive = status == SCX_TEST_SKIP ? "SKIP " : ""; + + printf("%s %u %s # %s\n", result, testnum, test->name, directive); + printf("===== END =====\n"); +} + +static bool should_skip_test(const struct scx_test *test, const char * filter) +{ + return !strstr(test->name, filter); +} + +static enum scx_test_status run_test(const struct scx_test *test) +{ + enum scx_test_status status; + void *context = NULL; + + if (test->setup) { + status = test->setup(&context); + if (status != SCX_TEST_PASS) + return status; + } + + status = test->run(context); + + if (test->cleanup) + test->cleanup(context); + + return status; +} + +static bool test_valid(const struct scx_test *test) +{ + if (!test) { + fprintf(stderr, "NULL test detected\n"); + return false; + } + + if (!test->name) { + fprintf(stderr, + "Test with no name found. Must specify test name.\n"); + return false; + } + + if (!test->description) { + fprintf(stderr, "Test %s requires description.\n", test->name); + return false; + } + + if (!test->run) { + fprintf(stderr, "Test %s has no run() callback\n", test->name); + return false; + } + + return true; +} + +int main(int argc, char **argv) +{ + const char *filter = NULL; + unsigned testnum = 0, i; + unsigned passed = 0, skipped = 0, failed = 0; + int opt; + + signal(SIGINT, sigint_handler); + signal(SIGTERM, sigint_handler); + + libbpf_set_strict_mode(LIBBPF_STRICT_ALL); + + while ((opt = getopt(argc, argv, "qst:h")) != -1) { + switch (opt) { + case 'q': + quiet = true; + break; + case 's': + print_skipped = true; + break; + case 't': + filter = optarg; + break; + default: + fprintf(stderr, help_fmt, basename(argv[0])); + return opt != 'h'; + } + } + + for (i = 0; i < __scx_num_tests; i++) { + enum scx_test_status status; + struct scx_test *test = &__scx_tests[i]; + + if (filter && should_skip_test(test, filter)) { + /* + * Printing the skipped tests and their preambles can + * add a lot of noise to the runner output. Printing + * this is only really useful for CI, so let's skip it + * by default. + */ + if (print_skipped) { + print_test_preamble(test, quiet); + print_test_result(test, SCX_TEST_SKIP, ++testnum); + } + continue; + } + + print_test_preamble(test, quiet); + status = run_test(test); + print_test_result(test, status, ++testnum); + switch (status) { + case SCX_TEST_PASS: + passed++; + break; + case SCX_TEST_SKIP: + skipped++; + break; + case SCX_TEST_FAIL: + failed++; + break; + } + } + printf("\n\n=============================\n\n"); + printf("RESULTS:\n\n"); + printf("PASSED: %u\n", passed); + printf("SKIPPED: %u\n", skipped); + printf("FAILED: %u\n", failed); + + return 0; +} + +void scx_test_register(struct scx_test *test) +{ + SCX_BUG_ON(!test_valid(test), "Invalid test found"); + SCX_BUG_ON(__scx_num_tests >= MAX_SCX_TESTS, "Maximum tests exceeded"); + + __scx_tests[__scx_num_tests++] = *test; +} diff --git a/tools/testing/selftests/sched_ext/scx_test.h b/tools/testing/selftests/sched_ext/scx_test.h new file mode 100644 index 000000000000..90b8d6915bb7 --- /dev/null +++ b/tools/testing/selftests/sched_ext/scx_test.h @@ -0,0 +1,131 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + */ + +#ifndef __SCX_TEST_H__ +#define __SCX_TEST_H__ + +#include <errno.h> +#include <scx/common.h> +#include <scx/compat.h> + +enum scx_test_status { + SCX_TEST_PASS = 0, + SCX_TEST_SKIP, + SCX_TEST_FAIL, +}; + +#define EXIT_KIND(__ent) __COMPAT_ENUM_OR_ZERO("scx_exit_kind", #__ent) + +struct scx_test { + /** + * name - The name of the testcase. + */ + const char *name; + + /** + * description - A description of your testcase: what it tests and is + * meant to validate. + */ + const char *description; + + /* + * setup - Setup the test. + * @ctx: A pointer to a context object that will be passed to run and + * cleanup. + * + * An optional callback that allows a testcase to perform setup for its + * run. A test may return SCX_TEST_SKIP to skip the run. + */ + enum scx_test_status (*setup)(void **ctx); + + /* + * run - Run the test. + * @ctx: Context set in the setup() callback. If @ctx was not set in + * setup(), it is NULL. + * + * The main test. Callers should return one of: + * + * - SCX_TEST_PASS: Test passed + * - SCX_TEST_SKIP: Test should be skipped + * - SCX_TEST_FAIL: Test failed + * + * This callback must be defined. + */ + enum scx_test_status (*run)(void *ctx); + + /* + * cleanup - Perform cleanup following the test + * @ctx: Context set in the setup() callback. If @ctx was not set in + * setup(), it is NULL. + * + * An optional callback that allows a test to perform cleanup after + * being run. This callback is run even if the run() callback returns + * SCX_TEST_SKIP or SCX_TEST_FAIL. It is not run if setup() returns + * SCX_TEST_SKIP or SCX_TEST_FAIL. + */ + void (*cleanup)(void *ctx); +}; + +void scx_test_register(struct scx_test *test); + +#define REGISTER_SCX_TEST(__test) \ + __attribute__((constructor)) \ + static void ___scxregister##__LINE__(void) \ + { \ + scx_test_register(__test); \ + } + +#define SCX_ERR(__fmt, ...) \ + do { \ + fprintf(stderr, "ERR: %s:%d\n", __FILE__, __LINE__); \ + fprintf(stderr, __fmt"\n", ##__VA_ARGS__); \ + } while (0) + +#define SCX_FAIL(__fmt, ...) \ + do { \ + SCX_ERR(__fmt, ##__VA_ARGS__); \ + return SCX_TEST_FAIL; \ + } while (0) + +#define SCX_FAIL_IF(__cond, __fmt, ...) \ + do { \ + if (__cond) \ + SCX_FAIL(__fmt, ##__VA_ARGS__); \ + } while (0) + +#define SCX_GT(_x, _y) SCX_FAIL_IF((_x) <= (_y), "Expected %s > %s (%lu > %lu)", \ + #_x, #_y, (u64)(_x), (u64)(_y)) +#define SCX_GE(_x, _y) SCX_FAIL_IF((_x) < (_y), "Expected %s >= %s (%lu >= %lu)", \ + #_x, #_y, (u64)(_x), (u64)(_y)) +#define SCX_LT(_x, _y) SCX_FAIL_IF((_x) >= (_y), "Expected %s < %s (%lu < %lu)", \ + #_x, #_y, (u64)(_x), (u64)(_y)) +#define SCX_LE(_x, _y) SCX_FAIL_IF((_x) > (_y), "Expected %s <= %s (%lu <= %lu)", \ + #_x, #_y, (u64)(_x), (u64)(_y)) +#define SCX_EQ(_x, _y) SCX_FAIL_IF((_x) != (_y), "Expected %s == %s (%lu == %lu)", \ + #_x, #_y, (u64)(_x), (u64)(_y)) +#define SCX_ASSERT(_x) SCX_FAIL_IF(!(_x), "Expected %s to be true (%lu)", \ + #_x, (u64)(_x)) + +#define SCX_ECODE_VAL(__ecode) ({ \ + u64 __val = 0; \ + bool __found = false; \ + \ + __found = __COMPAT_read_enum("scx_exit_code", #__ecode, &__val); \ + SCX_ASSERT(__found); \ + (s64)__val; \ +}) + +#define SCX_KIND_VAL(__kind) ({ \ + u64 __val = 0; \ + bool __found = false; \ + \ + __found = __COMPAT_read_enum("scx_exit_kind", #__kind, &__val); \ + SCX_ASSERT(__found); \ + __val; \ +}) + +#endif // # __SCX_TEST_H__ diff --git a/tools/testing/selftests/sched_ext/select_cpu_dfl.bpf.c b/tools/testing/selftests/sched_ext/select_cpu_dfl.bpf.c new file mode 100644 index 000000000000..2ed2991afafe --- /dev/null +++ b/tools/testing/selftests/sched_ext/select_cpu_dfl.bpf.c @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * A scheduler that validates the behavior of direct dispatching with a default + * select_cpu implementation. + * + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +bool saw_local = false; + +static bool task_is_test(const struct task_struct *p) +{ + return !bpf_strncmp(p->comm, 9, "select_cpu"); +} + +void BPF_STRUCT_OPS(select_cpu_dfl_enqueue, struct task_struct *p, + u64 enq_flags) +{ + const struct cpumask *idle_mask = scx_bpf_get_idle_cpumask(); + + if (task_is_test(p) && + bpf_cpumask_test_cpu(scx_bpf_task_cpu(p), idle_mask)) { + saw_local = true; + } + scx_bpf_put_idle_cpumask(idle_mask); + + scx_bpf_dispatch(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, enq_flags); +} + +SEC(".struct_ops.link") +struct sched_ext_ops select_cpu_dfl_ops = { + .enqueue = select_cpu_dfl_enqueue, + .name = "select_cpu_dfl", +}; diff --git a/tools/testing/selftests/sched_ext/select_cpu_dfl.c b/tools/testing/selftests/sched_ext/select_cpu_dfl.c new file mode 100644 index 000000000000..a53a40c2d2f0 --- /dev/null +++ b/tools/testing/selftests/sched_ext/select_cpu_dfl.c @@ -0,0 +1,72 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "select_cpu_dfl.bpf.skel.h" +#include "scx_test.h" + +#define NUM_CHILDREN 1028 + +static enum scx_test_status setup(void **ctx) +{ + struct select_cpu_dfl *skel; + + skel = select_cpu_dfl__open_and_load(); + SCX_FAIL_IF(!skel, "Failed to open and load skel"); + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct select_cpu_dfl *skel = ctx; + struct bpf_link *link; + pid_t pids[NUM_CHILDREN]; + int i, status; + + link = bpf_map__attach_struct_ops(skel->maps.select_cpu_dfl_ops); + SCX_FAIL_IF(!link, "Failed to attach scheduler"); + + for (i = 0; i < NUM_CHILDREN; i++) { + pids[i] = fork(); + if (pids[i] == 0) { + sleep(1); + exit(0); + } + } + + for (i = 0; i < NUM_CHILDREN; i++) { + SCX_EQ(waitpid(pids[i], &status, 0), pids[i]); + SCX_EQ(status, 0); + } + + SCX_ASSERT(!skel->bss->saw_local); + + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct select_cpu_dfl *skel = ctx; + + select_cpu_dfl__destroy(skel); +} + +struct scx_test select_cpu_dfl = { + .name = "select_cpu_dfl", + .description = "Verify the default ops.select_cpu() dispatches tasks " + "when idles cores are found, and skips ops.enqueue()", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&select_cpu_dfl) diff --git a/tools/testing/selftests/sched_ext/select_cpu_dfl_nodispatch.bpf.c b/tools/testing/selftests/sched_ext/select_cpu_dfl_nodispatch.bpf.c new file mode 100644 index 000000000000..4bb5abb2d369 --- /dev/null +++ b/tools/testing/selftests/sched_ext/select_cpu_dfl_nodispatch.bpf.c @@ -0,0 +1,89 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * A scheduler that validates the behavior of direct dispatching with a default + * select_cpu implementation, and with the SCX_OPS_ENQ_DFL_NO_DISPATCH ops flag + * specified. + * + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +bool saw_local = false; + +/* Per-task scheduling context */ +struct task_ctx { + bool force_local; /* CPU changed by ops.select_cpu() */ +}; + +struct { + __uint(type, BPF_MAP_TYPE_TASK_STORAGE); + __uint(map_flags, BPF_F_NO_PREALLOC); + __type(key, int); + __type(value, struct task_ctx); +} task_ctx_stor SEC(".maps"); + +/* Manually specify the signature until the kfunc is added to the scx repo. */ +s32 scx_bpf_select_cpu_dfl(struct task_struct *p, s32 prev_cpu, u64 wake_flags, + bool *found) __ksym; + +s32 BPF_STRUCT_OPS(select_cpu_dfl_nodispatch_select_cpu, struct task_struct *p, + s32 prev_cpu, u64 wake_flags) +{ + struct task_ctx *tctx; + s32 cpu; + + tctx = bpf_task_storage_get(&task_ctx_stor, p, 0, 0); + if (!tctx) { + scx_bpf_error("task_ctx lookup failed"); + return -ESRCH; + } + + cpu = scx_bpf_select_cpu_dfl(p, prev_cpu, wake_flags, + &tctx->force_local); + + return cpu; +} + +void BPF_STRUCT_OPS(select_cpu_dfl_nodispatch_enqueue, struct task_struct *p, + u64 enq_flags) +{ + u64 dsq_id = SCX_DSQ_GLOBAL; + struct task_ctx *tctx; + + tctx = bpf_task_storage_get(&task_ctx_stor, p, 0, 0); + if (!tctx) { + scx_bpf_error("task_ctx lookup failed"); + return; + } + + if (tctx->force_local) { + dsq_id = SCX_DSQ_LOCAL; + tctx->force_local = false; + saw_local = true; + } + + scx_bpf_dispatch(p, dsq_id, SCX_SLICE_DFL, enq_flags); +} + +s32 BPF_STRUCT_OPS(select_cpu_dfl_nodispatch_init_task, + struct task_struct *p, struct scx_init_task_args *args) +{ + if (bpf_task_storage_get(&task_ctx_stor, p, 0, + BPF_LOCAL_STORAGE_GET_F_CREATE)) + return 0; + else + return -ENOMEM; +} + +SEC(".struct_ops.link") +struct sched_ext_ops select_cpu_dfl_nodispatch_ops = { + .select_cpu = select_cpu_dfl_nodispatch_select_cpu, + .enqueue = select_cpu_dfl_nodispatch_enqueue, + .init_task = select_cpu_dfl_nodispatch_init_task, + .name = "select_cpu_dfl_nodispatch", +}; diff --git a/tools/testing/selftests/sched_ext/select_cpu_dfl_nodispatch.c b/tools/testing/selftests/sched_ext/select_cpu_dfl_nodispatch.c new file mode 100644 index 000000000000..1d85bf4bf3a3 --- /dev/null +++ b/tools/testing/selftests/sched_ext/select_cpu_dfl_nodispatch.c @@ -0,0 +1,72 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "select_cpu_dfl_nodispatch.bpf.skel.h" +#include "scx_test.h" + +#define NUM_CHILDREN 1028 + +static enum scx_test_status setup(void **ctx) +{ + struct select_cpu_dfl_nodispatch *skel; + + skel = select_cpu_dfl_nodispatch__open_and_load(); + SCX_FAIL_IF(!skel, "Failed to open and load skel"); + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct select_cpu_dfl_nodispatch *skel = ctx; + struct bpf_link *link; + pid_t pids[NUM_CHILDREN]; + int i, status; + + link = bpf_map__attach_struct_ops(skel->maps.select_cpu_dfl_nodispatch_ops); + SCX_FAIL_IF(!link, "Failed to attach scheduler"); + + for (i = 0; i < NUM_CHILDREN; i++) { + pids[i] = fork(); + if (pids[i] == 0) { + sleep(1); + exit(0); + } + } + + for (i = 0; i < NUM_CHILDREN; i++) { + SCX_EQ(waitpid(pids[i], &status, 0), pids[i]); + SCX_EQ(status, 0); + } + + SCX_ASSERT(skel->bss->saw_local); + + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct select_cpu_dfl_nodispatch *skel = ctx; + + select_cpu_dfl_nodispatch__destroy(skel); +} + +struct scx_test select_cpu_dfl_nodispatch = { + .name = "select_cpu_dfl_nodispatch", + .description = "Verify behavior of scx_bpf_select_cpu_dfl() in " + "ops.select_cpu()", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&select_cpu_dfl_nodispatch) diff --git a/tools/testing/selftests/sched_ext/select_cpu_dispatch.bpf.c b/tools/testing/selftests/sched_ext/select_cpu_dispatch.bpf.c new file mode 100644 index 000000000000..f0b96a4a04b2 --- /dev/null +++ b/tools/testing/selftests/sched_ext/select_cpu_dispatch.bpf.c @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * A scheduler that validates the behavior of direct dispatching with a default + * select_cpu implementation. + * + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +s32 BPF_STRUCT_OPS(select_cpu_dispatch_select_cpu, struct task_struct *p, + s32 prev_cpu, u64 wake_flags) +{ + u64 dsq_id = SCX_DSQ_LOCAL; + s32 cpu = prev_cpu; + + if (scx_bpf_test_and_clear_cpu_idle(cpu)) + goto dispatch; + + cpu = scx_bpf_pick_idle_cpu(p->cpus_ptr, 0); + if (cpu >= 0) + goto dispatch; + + dsq_id = SCX_DSQ_GLOBAL; + cpu = prev_cpu; + +dispatch: + scx_bpf_dispatch(p, dsq_id, SCX_SLICE_DFL, 0); + return cpu; +} + +SEC(".struct_ops.link") +struct sched_ext_ops select_cpu_dispatch_ops = { + .select_cpu = select_cpu_dispatch_select_cpu, + .name = "select_cpu_dispatch", + .timeout_ms = 1000U, +}; diff --git a/tools/testing/selftests/sched_ext/select_cpu_dispatch.c b/tools/testing/selftests/sched_ext/select_cpu_dispatch.c new file mode 100644 index 000000000000..0309ca8785b3 --- /dev/null +++ b/tools/testing/selftests/sched_ext/select_cpu_dispatch.c @@ -0,0 +1,70 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "select_cpu_dispatch.bpf.skel.h" +#include "scx_test.h" + +#define NUM_CHILDREN 1028 + +static enum scx_test_status setup(void **ctx) +{ + struct select_cpu_dispatch *skel; + + skel = select_cpu_dispatch__open_and_load(); + SCX_FAIL_IF(!skel, "Failed to open and load skel"); + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct select_cpu_dispatch *skel = ctx; + struct bpf_link *link; + pid_t pids[NUM_CHILDREN]; + int i, status; + + link = bpf_map__attach_struct_ops(skel->maps.select_cpu_dispatch_ops); + SCX_FAIL_IF(!link, "Failed to attach scheduler"); + + for (i = 0; i < NUM_CHILDREN; i++) { + pids[i] = fork(); + if (pids[i] == 0) { + sleep(1); + exit(0); + } + } + + for (i = 0; i < NUM_CHILDREN; i++) { + SCX_EQ(waitpid(pids[i], &status, 0), pids[i]); + SCX_EQ(status, 0); + } + + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct select_cpu_dispatch *skel = ctx; + + select_cpu_dispatch__destroy(skel); +} + +struct scx_test select_cpu_dispatch = { + .name = "select_cpu_dispatch", + .description = "Test direct dispatching to built-in DSQs from " + "ops.select_cpu()", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&select_cpu_dispatch) diff --git a/tools/testing/selftests/sched_ext/select_cpu_dispatch_bad_dsq.bpf.c b/tools/testing/selftests/sched_ext/select_cpu_dispatch_bad_dsq.bpf.c new file mode 100644 index 000000000000..7b42ddce0f56 --- /dev/null +++ b/tools/testing/selftests/sched_ext/select_cpu_dispatch_bad_dsq.bpf.c @@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * A scheduler that validates the behavior of direct dispatching with a default + * select_cpu implementation. + * + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +UEI_DEFINE(uei); + +s32 BPF_STRUCT_OPS(select_cpu_dispatch_bad_dsq_select_cpu, struct task_struct *p, + s32 prev_cpu, u64 wake_flags) +{ + /* Dispatching to a random DSQ should fail. */ + scx_bpf_dispatch(p, 0xcafef00d, SCX_SLICE_DFL, 0); + + return prev_cpu; +} + +void BPF_STRUCT_OPS(select_cpu_dispatch_bad_dsq_exit, struct scx_exit_info *ei) +{ + UEI_RECORD(uei, ei); +} + +SEC(".struct_ops.link") +struct sched_ext_ops select_cpu_dispatch_bad_dsq_ops = { + .select_cpu = select_cpu_dispatch_bad_dsq_select_cpu, + .exit = select_cpu_dispatch_bad_dsq_exit, + .name = "select_cpu_dispatch_bad_dsq", + .timeout_ms = 1000U, +}; diff --git a/tools/testing/selftests/sched_ext/select_cpu_dispatch_bad_dsq.c b/tools/testing/selftests/sched_ext/select_cpu_dispatch_bad_dsq.c new file mode 100644 index 000000000000..47eb6ed7627d --- /dev/null +++ b/tools/testing/selftests/sched_ext/select_cpu_dispatch_bad_dsq.c @@ -0,0 +1,56 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "select_cpu_dispatch_bad_dsq.bpf.skel.h" +#include "scx_test.h" + +static enum scx_test_status setup(void **ctx) +{ + struct select_cpu_dispatch_bad_dsq *skel; + + skel = select_cpu_dispatch_bad_dsq__open_and_load(); + SCX_FAIL_IF(!skel, "Failed to open and load skel"); + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct select_cpu_dispatch_bad_dsq *skel = ctx; + struct bpf_link *link; + + link = bpf_map__attach_struct_ops(skel->maps.select_cpu_dispatch_bad_dsq_ops); + SCX_FAIL_IF(!link, "Failed to attach scheduler"); + + sleep(1); + + SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_ERROR)); + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct select_cpu_dispatch_bad_dsq *skel = ctx; + + select_cpu_dispatch_bad_dsq__destroy(skel); +} + +struct scx_test select_cpu_dispatch_bad_dsq = { + .name = "select_cpu_dispatch_bad_dsq", + .description = "Verify graceful failure if we direct-dispatch to a " + "bogus DSQ in ops.select_cpu()", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&select_cpu_dispatch_bad_dsq) diff --git a/tools/testing/selftests/sched_ext/select_cpu_dispatch_dbl_dsp.bpf.c b/tools/testing/selftests/sched_ext/select_cpu_dispatch_dbl_dsp.bpf.c new file mode 100644 index 000000000000..653e3dc0b4dc --- /dev/null +++ b/tools/testing/selftests/sched_ext/select_cpu_dispatch_dbl_dsp.bpf.c @@ -0,0 +1,38 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * A scheduler that validates the behavior of direct dispatching with a default + * select_cpu implementation. + * + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +UEI_DEFINE(uei); + +s32 BPF_STRUCT_OPS(select_cpu_dispatch_dbl_dsp_select_cpu, struct task_struct *p, + s32 prev_cpu, u64 wake_flags) +{ + /* Dispatching twice in a row is disallowed. */ + scx_bpf_dispatch(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, 0); + scx_bpf_dispatch(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, 0); + + return prev_cpu; +} + +void BPF_STRUCT_OPS(select_cpu_dispatch_dbl_dsp_exit, struct scx_exit_info *ei) +{ + UEI_RECORD(uei, ei); +} + +SEC(".struct_ops.link") +struct sched_ext_ops select_cpu_dispatch_dbl_dsp_ops = { + .select_cpu = select_cpu_dispatch_dbl_dsp_select_cpu, + .exit = select_cpu_dispatch_dbl_dsp_exit, + .name = "select_cpu_dispatch_dbl_dsp", + .timeout_ms = 1000U, +}; diff --git a/tools/testing/selftests/sched_ext/select_cpu_dispatch_dbl_dsp.c b/tools/testing/selftests/sched_ext/select_cpu_dispatch_dbl_dsp.c new file mode 100644 index 000000000000..48ff028a3c46 --- /dev/null +++ b/tools/testing/selftests/sched_ext/select_cpu_dispatch_dbl_dsp.c @@ -0,0 +1,56 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2023 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2023 David Vernet <dvernet@meta.com> + * Copyright (c) 2023 Tejun Heo <tj@kernel.org> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "select_cpu_dispatch_dbl_dsp.bpf.skel.h" +#include "scx_test.h" + +static enum scx_test_status setup(void **ctx) +{ + struct select_cpu_dispatch_dbl_dsp *skel; + + skel = select_cpu_dispatch_dbl_dsp__open_and_load(); + SCX_FAIL_IF(!skel, "Failed to open and load skel"); + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct select_cpu_dispatch_dbl_dsp *skel = ctx; + struct bpf_link *link; + + link = bpf_map__attach_struct_ops(skel->maps.select_cpu_dispatch_dbl_dsp_ops); + SCX_FAIL_IF(!link, "Failed to attach scheduler"); + + sleep(1); + + SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_ERROR)); + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct select_cpu_dispatch_dbl_dsp *skel = ctx; + + select_cpu_dispatch_dbl_dsp__destroy(skel); +} + +struct scx_test select_cpu_dispatch_dbl_dsp = { + .name = "select_cpu_dispatch_dbl_dsp", + .description = "Verify graceful failure if we dispatch twice to a " + "DSQ in ops.select_cpu()", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&select_cpu_dispatch_dbl_dsp) diff --git a/tools/testing/selftests/sched_ext/select_cpu_vtime.bpf.c b/tools/testing/selftests/sched_ext/select_cpu_vtime.bpf.c new file mode 100644 index 000000000000..7f3ebf4fc2ea --- /dev/null +++ b/tools/testing/selftests/sched_ext/select_cpu_vtime.bpf.c @@ -0,0 +1,92 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * A scheduler that validates that enqueue flags are properly stored and + * applied at dispatch time when a task is directly dispatched from + * ops.select_cpu(). We validate this by using scx_bpf_dispatch_vtime(), and + * making the test a very basic vtime scheduler. + * + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + * Copyright (c) 2024 Tejun Heo <tj@kernel.org> + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +volatile bool consumed; + +static u64 vtime_now; + +#define VTIME_DSQ 0 + +static inline bool vtime_before(u64 a, u64 b) +{ + return (s64)(a - b) < 0; +} + +static inline u64 task_vtime(const struct task_struct *p) +{ + u64 vtime = p->scx.dsq_vtime; + + if (vtime_before(vtime, vtime_now - SCX_SLICE_DFL)) + return vtime_now - SCX_SLICE_DFL; + else + return vtime; +} + +s32 BPF_STRUCT_OPS(select_cpu_vtime_select_cpu, struct task_struct *p, + s32 prev_cpu, u64 wake_flags) +{ + s32 cpu; + + cpu = scx_bpf_pick_idle_cpu(p->cpus_ptr, 0); + if (cpu >= 0) + goto ddsp; + + cpu = prev_cpu; + scx_bpf_test_and_clear_cpu_idle(cpu); +ddsp: + scx_bpf_dispatch_vtime(p, VTIME_DSQ, SCX_SLICE_DFL, task_vtime(p), 0); + return cpu; +} + +void BPF_STRUCT_OPS(select_cpu_vtime_dispatch, s32 cpu, struct task_struct *p) +{ + if (scx_bpf_consume(VTIME_DSQ)) + consumed = true; +} + +void BPF_STRUCT_OPS(select_cpu_vtime_running, struct task_struct *p) +{ + if (vtime_before(vtime_now, p->scx.dsq_vtime)) + vtime_now = p->scx.dsq_vtime; +} + +void BPF_STRUCT_OPS(select_cpu_vtime_stopping, struct task_struct *p, + bool runnable) +{ + p->scx.dsq_vtime += (SCX_SLICE_DFL - p->scx.slice) * 100 / p->scx.weight; +} + +void BPF_STRUCT_OPS(select_cpu_vtime_enable, struct task_struct *p) +{ + p->scx.dsq_vtime = vtime_now; +} + +s32 BPF_STRUCT_OPS_SLEEPABLE(select_cpu_vtime_init) +{ + return scx_bpf_create_dsq(VTIME_DSQ, -1); +} + +SEC(".struct_ops.link") +struct sched_ext_ops select_cpu_vtime_ops = { + .select_cpu = select_cpu_vtime_select_cpu, + .dispatch = select_cpu_vtime_dispatch, + .running = select_cpu_vtime_running, + .stopping = select_cpu_vtime_stopping, + .enable = select_cpu_vtime_enable, + .init = select_cpu_vtime_init, + .name = "select_cpu_vtime", + .timeout_ms = 1000U, +}; diff --git a/tools/testing/selftests/sched_ext/select_cpu_vtime.c b/tools/testing/selftests/sched_ext/select_cpu_vtime.c new file mode 100644 index 000000000000..b4629c2364f5 --- /dev/null +++ b/tools/testing/selftests/sched_ext/select_cpu_vtime.c @@ -0,0 +1,59 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + * Copyright (c) 2024 Tejun Heo <tj@kernel.org> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "select_cpu_vtime.bpf.skel.h" +#include "scx_test.h" + +static enum scx_test_status setup(void **ctx) +{ + struct select_cpu_vtime *skel; + + skel = select_cpu_vtime__open_and_load(); + SCX_FAIL_IF(!skel, "Failed to open and load skel"); + *ctx = skel; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct select_cpu_vtime *skel = ctx; + struct bpf_link *link; + + SCX_ASSERT(!skel->bss->consumed); + + link = bpf_map__attach_struct_ops(skel->maps.select_cpu_vtime_ops); + SCX_FAIL_IF(!link, "Failed to attach scheduler"); + + sleep(1); + + SCX_ASSERT(skel->bss->consumed); + + bpf_link__destroy(link); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct select_cpu_vtime *skel = ctx; + + select_cpu_vtime__destroy(skel); +} + +struct scx_test select_cpu_vtime = { + .name = "select_cpu_vtime", + .description = "Test doing direct vtime-dispatching from " + "ops.select_cpu(), to a non-built-in DSQ", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&select_cpu_vtime) diff --git a/tools/testing/selftests/sched_ext/test_example.c b/tools/testing/selftests/sched_ext/test_example.c new file mode 100644 index 000000000000..ce36cdf03cdc --- /dev/null +++ b/tools/testing/selftests/sched_ext/test_example.c @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 Tejun Heo <tj@kernel.org> + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ +#include <bpf/bpf.h> +#include <scx/common.h> +#include "scx_test.h" + +static bool setup_called = false; +static bool run_called = false; +static bool cleanup_called = false; + +static int context = 10; + +static enum scx_test_status setup(void **ctx) +{ + setup_called = true; + *ctx = &context; + + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + int *arg = ctx; + + SCX_ASSERT(setup_called); + SCX_ASSERT(!run_called && !cleanup_called); + SCX_EQ(*arg, context); + + run_called = true; + return SCX_TEST_PASS; +} + +static void cleanup (void *ctx) +{ + SCX_BUG_ON(!run_called || cleanup_called, "Wrong callbacks invoked"); +} + +struct scx_test example = { + .name = "example", + .description = "Validate the basic function of the test suite itself", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&example) diff --git a/tools/testing/selftests/sched_ext/util.c b/tools/testing/selftests/sched_ext/util.c new file mode 100644 index 000000000000..e47769c91918 --- /dev/null +++ b/tools/testing/selftests/sched_ext/util.c @@ -0,0 +1,71 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <dvernet@meta.com> + */ +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +/* Returns read len on success, or -errno on failure. */ +static ssize_t read_text(const char *path, char *buf, size_t max_len) +{ + ssize_t len; + int fd; + + fd = open(path, O_RDONLY); + if (fd < 0) + return -errno; + + len = read(fd, buf, max_len - 1); + + if (len >= 0) + buf[len] = 0; + + close(fd); + return len < 0 ? -errno : len; +} + +/* Returns written len on success, or -errno on failure. */ +static ssize_t write_text(const char *path, char *buf, ssize_t len) +{ + int fd; + ssize_t written; + + fd = open(path, O_WRONLY | O_APPEND); + if (fd < 0) + return -errno; + + written = write(fd, buf, len); + close(fd); + return written < 0 ? -errno : written; +} + +long file_read_long(const char *path) +{ + char buf[128]; + + + if (read_text(path, buf, sizeof(buf)) <= 0) + return -1; + + return atol(buf); +} + +int file_write_long(const char *path, long val) +{ + char buf[64]; + int ret; + + ret = sprintf(buf, "%lu", val); + if (ret < 0) + return ret; + + if (write_text(path, buf, sizeof(buf)) <= 0) + return -1; + + return 0; +} diff --git a/tools/testing/selftests/sched_ext/util.h b/tools/testing/selftests/sched_ext/util.h new file mode 100644 index 000000000000..bc13dfec1267 --- /dev/null +++ b/tools/testing/selftests/sched_ext/util.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. + * Copyright (c) 2024 David Vernet <void@manifault.com> + */ + +#ifndef __SCX_TEST_UTIL_H__ +#define __SCX_TEST_UTIL_H__ + +long file_read_long(const char *path); +int file_write_long(const char *path, long val); + +#endif // __SCX_TEST_H__ -- 2.34.1