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[PATCH kernel-4.19 0/6] Perf: backport JVMTI plugin from mainline 5.7
by Zhichang Yuan 18 May '21

18 May '21

This series is a set of backports to enhance the JVMTI plugin support in Linux perf tool. It allows one to use perf to profile Java applications and attain clearer symbols output. Nick Gasson (6): perf jvmti: Fix jitdump for methods without debug info perf jvmti: Do not report error when missing debug information perf tests: Add test for the java demangler perf jvmti: Fix demangling Java symbols perf jvmti: Remove redundant jitdump line table entries perf jit: Fix inaccurate DWARF line table tools/perf/jvmti/libjvmti.c | 92 ++++++++++++--------------- tools/perf/tests/Build | 1 + tools/perf/tests/builtin-test.c | 4 ++ tools/perf/tests/demangle-java-test.c | 42 ++++++++++++ tools/perf/tests/tests.h | 1 + tools/perf/util/demangle-java.c | 13 ++-- tools/perf/util/genelf_debug.c | 4 +- 7 files changed, 96 insertions(+), 61 deletions(-) create mode 100644 tools/perf/tests/demangle-java-test.c -- 2.23.0

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[PATCH openEuler-1.0-LTS 1/2] bpf: Fix masking negation logic upon negative dst register
by Yang Yingliang 18 May '21

18 May '21

From: Daniel Borkmann <daniel(a)iogearbox.net> stable inclusion from linux-4.19.190 commit 0e2dfdc74a7f4036127356d42ea59388f153f42c -------------------------------- commit b9b34ddbe2076ade359cd5ce7537d5ed019e9807 upstream. The negation logic for the case where the off_reg is sitting in the dst register is not correct given then we cannot just invert the add to a sub or vice versa. As a fix, perform the final bitwise and-op unconditionally into AX from the off_reg, then move the pointer from the src to dst and finally use AX as the source for the original pointer arithmetic operation such that the inversion yields a correct result. The single non-AX mov in between is possible given constant blinding is retaining it as it's not an immediate based operation. Fixes: 979d63d50c0c ("bpf: prevent out of bounds speculation on pointer arithmetic") Signed-off-by: Daniel Borkmann <daniel(a)iogearbox.net> Tested-by: Piotr Krysiuk <piotras(a)gmail.com> Reviewed-by: Piotr Krysiuk <piotras(a)gmail.com> Reviewed-by: John Fastabend <john.fastabend(a)gmail.com> Acked-by: Alexei Starovoitov <ast(a)kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- kernel/bpf/verifier.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index c1df2803033d3..79b50911008a0 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -6373,14 +6373,10 @@ static int fixup_bpf_calls(struct bpf_verifier_env *env) *patch++ = BPF_ALU64_REG(BPF_OR, BPF_REG_AX, off_reg); *patch++ = BPF_ALU64_IMM(BPF_NEG, BPF_REG_AX, 0); *patch++ = BPF_ALU64_IMM(BPF_ARSH, BPF_REG_AX, 63); - if (issrc) { - *patch++ = BPF_ALU64_REG(BPF_AND, BPF_REG_AX, - off_reg); - insn->src_reg = BPF_REG_AX; - } else { - *patch++ = BPF_ALU64_REG(BPF_AND, off_reg, - BPF_REG_AX); - } + *patch++ = BPF_ALU64_REG(BPF_AND, BPF_REG_AX, off_reg); + if (!issrc) + *patch++ = BPF_MOV64_REG(insn->dst_reg, insn->src_reg); + insn->src_reg = BPF_REG_AX; if (isneg) insn->code = insn->code == code_add ? code_sub : code_add; -- 2.25.1

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[PATCH kernel-4.19] bpf: Fix leakage of uninitialized bpf stack under speculation
by Yang Yingliang 18 May '21

18 May '21

From: Daniel Borkmann <daniel(a)iogearbox.net> mainline inclusion from mainline-v5.13-rc1 commit 801c6058d14a82179a7ee17a4b532cac6fad067f category: bugfix bugzilla: NA CVE: CVE-2021-31829 -------------------------------- The current implemented mechanisms to mitigate data disclosure under speculation mainly address stack and map value oob access from the speculative domain. However, Piotr discovered that uninitialized BPF stack is not protected yet, and thus old data from the kernel stack, potentially including addresses of kernel structures, could still be extracted from that 512 bytes large window. The BPF stack is special compared to map values since it's not zero initialized for every program invocation, whereas map values /are/ zero initialized upon their initial allocation and thus cannot leak any prior data in either domain. In the non-speculative domain, the verifier ensures that every stack slot read must have a prior stack slot write by the BPF program to avoid such data leaking issue. However, this is not enough: for example, when the pointer arithmetic operation moves the stack pointer from the last valid stack offset to the first valid offset, the sanitation logic allows for any intermediate offsets during speculative execution, which could then be used to extract any restricted stack content via side-channel. Given for unprivileged stack pointer arithmetic the use of unknown but bounded scalars is generally forbidden, we can simply turn the register-based arithmetic operation into an immediate-based arithmetic operation without the need for masking. This also gives the benefit of reducing the needed instructions for the operation. Given after the work in 7fedb63a8307 ("bpf: Tighten speculative pointer arithmetic mask"), the aux->alu_limit already holds the final immediate value for the offset register with the known scalar. Thus, a simple mov of the immediate to AX register with using AX as the source for the original instruction is sufficient and possible now in this case. Reported-by: Piotr Krysiuk <piotras(a)gmail.com> Signed-off-by: Daniel Borkmann <daniel(a)iogearbox.net> Tested-by: Piotr Krysiuk <piotras(a)gmail.com> Reviewed-by: Piotr Krysiuk <piotras(a)gmail.com> Reviewed-by: John Fastabend <john.fastabend(a)gmail.com> Acked-by: Alexei Starovoitov <ast(a)kernel.org> Conflicts: kernel/bpf/verifier.c Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> Reviewed-by: Xiu Jianfeng <xiujianfeng(a)huawei.com> Reviewed-by: Kuohai Xu <xukuohai(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- include/linux/bpf_verifier.h | 5 +++-- kernel/bpf/verifier.c | 27 +++++++++++++++++---------- 2 files changed, 20 insertions(+), 12 deletions(-) diff --git a/include/linux/bpf_verifier.h b/include/linux/bpf_verifier.h index 42dc8c2146f4d..daab0960c0544 100644 --- a/include/linux/bpf_verifier.h +++ b/include/linux/bpf_verifier.h @@ -142,10 +142,11 @@ struct bpf_verifier_state_list { }; /* Possible states for alu_state member. */ -#define BPF_ALU_SANITIZE_SRC 1U -#define BPF_ALU_SANITIZE_DST 2U +#define BPF_ALU_SANITIZE_SRC (1U << 0) +#define BPF_ALU_SANITIZE_DST (1U << 1) #define BPF_ALU_NEG_VALUE (1U << 2) #define BPF_ALU_NON_POINTER (1U << 3) +#define BPF_ALU_IMMEDIATE (1U << 4) #define BPF_ALU_SANITIZE (BPF_ALU_SANITIZE_SRC | \ BPF_ALU_SANITIZE_DST) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 46e21bdb79c4c..c49aa17839875 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -2745,6 +2745,7 @@ static int sanitize_ptr_alu(struct bpf_verifier_env *env, { struct bpf_insn_aux_data *aux = commit_window ? cur_aux(env) : tmp_aux; struct bpf_verifier_state *vstate = env->cur_state; + bool off_is_imm = tnum_is_const(off_reg->var_off); bool off_is_neg = off_reg->smin_value < 0; bool ptr_is_dst_reg = ptr_reg == dst_reg; u8 opcode = BPF_OP(insn->code); @@ -2775,6 +2776,7 @@ static int sanitize_ptr_alu(struct bpf_verifier_env *env, alu_limit = abs(tmp_aux->alu_limit - alu_limit); } else { alu_state = off_is_neg ? BPF_ALU_NEG_VALUE : 0; + alu_state |= off_is_imm ? BPF_ALU_IMMEDIATE : 0; alu_state |= ptr_is_dst_reg ? BPF_ALU_SANITIZE_SRC : BPF_ALU_SANITIZE_DST; } @@ -6301,7 +6303,7 @@ static int fixup_bpf_calls(struct bpf_verifier_env *env) const u8 code_sub = BPF_ALU64 | BPF_SUB | BPF_X; struct bpf_insn insn_buf[16]; struct bpf_insn *patch = &insn_buf[0]; - bool issrc, isneg; + bool issrc, isneg, isimm; u32 off_reg; aux = &env->insn_aux_data[i + delta]; @@ -6312,16 +6314,21 @@ static int fixup_bpf_calls(struct bpf_verifier_env *env) isneg = aux->alu_state & BPF_ALU_NEG_VALUE; issrc = (aux->alu_state & BPF_ALU_SANITIZE) == BPF_ALU_SANITIZE_SRC; + isimm = aux->alu_state & BPF_ALU_IMMEDIATE; off_reg = issrc ? insn->src_reg : insn->dst_reg; - if (isneg) - *patch++ = BPF_ALU64_IMM(BPF_MUL, off_reg, -1); - *patch++ = BPF_MOV32_IMM(BPF_REG_AX, aux->alu_limit); - *patch++ = BPF_ALU64_REG(BPF_SUB, BPF_REG_AX, off_reg); - *patch++ = BPF_ALU64_REG(BPF_OR, BPF_REG_AX, off_reg); - *patch++ = BPF_ALU64_IMM(BPF_NEG, BPF_REG_AX, 0); - *patch++ = BPF_ALU64_IMM(BPF_ARSH, BPF_REG_AX, 63); - *patch++ = BPF_ALU64_REG(BPF_AND, BPF_REG_AX, off_reg); + if (isimm) { + *patch++ = BPF_MOV32_IMM(BPF_REG_AX, aux->alu_limit); + } else { + if (isneg) + *patch++ = BPF_ALU64_IMM(BPF_MUL, off_reg, -1); + *patch++ = BPF_MOV32_IMM(BPF_REG_AX, aux->alu_limit); + *patch++ = BPF_ALU64_REG(BPF_SUB, BPF_REG_AX, off_reg); + *patch++ = BPF_ALU64_REG(BPF_OR, BPF_REG_AX, off_reg); + *patch++ = BPF_ALU64_IMM(BPF_NEG, BPF_REG_AX, 0); + *patch++ = BPF_ALU64_IMM(BPF_ARSH, BPF_REG_AX, 63); + *patch++ = BPF_ALU64_REG(BPF_AND, BPF_REG_AX, off_reg); + } if (!issrc) *patch++ = BPF_MOV64_REG(insn->dst_reg, insn->src_reg); insn->src_reg = BPF_REG_AX; @@ -6329,7 +6336,7 @@ static int fixup_bpf_calls(struct bpf_verifier_env *env) insn->code = insn->code == code_add ? code_sub : code_add; *patch++ = *insn; - if (issrc && isneg) + if (issrc && isneg && !isimm) *patch++ = BPF_ALU64_IMM(BPF_MUL, off_reg, -1); cnt = patch - insn_buf; -- 2.25.1

1 0

[PATCH openEuler-20.03-LTS-SP1] mm/page_alloc: fix managed_pages of zone is incorrect and out of bounds
by Guo Hui 18 May '21

18 May '21

uniontech inclusion category: bugfix bugzilla: NA CVE: NA Commit eb761d6521c3 ("mm: parallelize deferred struct page initialization within each node") the code "++zone" in follow code: /* Sanity check that the next zone really is unpopulated */ WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone)); VM_BUG_ON(nr_init != nr_free); zone->managed_pages += nr_free; makes the managed_pages statistics of the current zone incorrect and the zone may have out-of-bounds memory when CONFIG_DEFERRED_STRUCT_PAGE_INIT=y, causing the Virtual machine system startup to fail when the Virtual machine system current allocated memory is set to half of the Virtual machine maximum memory using virt-manager tool Fix it by putting the code “zone->managed_pages += nr_free;” before “++zone” code Fixes: eb761d6521c3 ("mm: parallelize deferred struct page initialization within each node") Reported-by: Peng Yuanbo <pengyuanbo(a)uniontech.com> Signed-off-by: Guo Hui <guohui(a)uniontech.com> --- mm/page_alloc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 0888870e3458..6bf3d4461430 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1688,12 +1688,13 @@ static int __init deferred_init_memmap(void *data) nr_free += atomic64_read(&args.nr_pages); } - /* Sanity check that the next zone really is unpopulated */ - WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone)); VM_BUG_ON(nr_init != nr_free); zone->managed_pages += nr_free; + /* Sanity check that the next zone really is unpopulated */ + WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone)); + pr_info("node %d initialised, %lu pages in %ums\n", nid, nr_free, jiffies_to_msecs(jiffies - start)); -- 2.20.1

2 1

[PATCH kernel-4.19 0/6] Perf: backport JVMTI plugin from mainline 5.7
by Zhichang Yuan 18 May '21

18 May '21

This series is a set of backports to enhance the JVMTI plugin support in Linux perf tool. It allows one to use perf to profile Java applications and attain clearer symbols output. Nick Gasson (6): perf jvmti: Fix jitdump for methods without debug info perf jvmti: Do not report error when missing debug information perf tests: Add test for the java demangler perf jvmti: Fix demangling Java symbols perf jvmti: Remove redundant jitdump line table entries perf jit: Fix inaccurate DWARF line table tools/perf/jvmti/libjvmti.c | 92 ++++++++++++--------------- tools/perf/tests/Build | 1 + tools/perf/tests/builtin-test.c | 4 ++ tools/perf/tests/demangle-java-test.c | 42 ++++++++++++ tools/perf/tests/tests.h | 1 + tools/perf/util/demangle-java.c | 13 ++-- tools/perf/util/genelf_debug.c | 4 +- 7 files changed, 96 insertions(+), 61 deletions(-) create mode 100644 tools/perf/tests/demangle-java-test.c -- 2.23.0 IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

1 6

[PATCH kernel-4.19 1/4] itrace: Add interrupts trace support
by Yang Yingliang 18 May '21

18 May '21

From: Bixuan Cui <cuibixuan(a)huawei.com> ascend inclusion category: feature bugzilla: NA CVE: NA --------------------------------------------- Itrace (Interrupt Tracing) is a lightweight interrupt tracing tool. It supports the following functions: * Ihandler(Interrupt Handler) tracer can trace and calculate the time consumed of the hardware irq function and list the name, number and duration of the interrupt. * Ihandler supports dynamic disable and threshold setting. Signed-off-by: Bixuan Cui <cuibixuan(a)huawei.com> Reviewed-by: Ding Tianhong <dingtianhong(a)huawei.com> Reviewed-by: Hanjun Guo <guohanjun(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- include/linux/itrace.h | 47 ++++++++++ kernel/irq/handle.c | 3 + kernel/irq/proc.c | 100 +++++++++++++++++++++ kernel/trace/Kconfig | 22 +++++ kernel/trace/Makefile | 2 + kernel/trace/itrace_ihandler.c | 154 +++++++++++++++++++++++++++++++++ 6 files changed, 328 insertions(+) create mode 100644 include/linux/itrace.h create mode 100644 kernel/trace/itrace_ihandler.c diff --git a/include/linux/itrace.h b/include/linux/itrace.h new file mode 100644 index 0000000000000..d7916581e03f2 --- /dev/null +++ b/include/linux/itrace.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright(c) 2021 Huawei Technologies Co., Ltd + * Author: Bixuan Cui <cuibixuan(a)huawei.com> + */ + +#ifndef __LINUX_ITRACE_H +#define __LINUX_ITRACE_H + +#define IRQ_NAME_LEN 20 +#define IHANDLER_INFO_NUM_MIN 1 +#define IHANDLER_INFO_NUM_MAX 30 +#define IHANDLER_INFO_CT_MAX 99999 +#define IHANDLER_THRESHOLD_MAX 10000000 +#define IHANDLER_OFF 0 +#define IHANDLER_ON 1 + +struct irq_handler_info { + int irq; + char name[IRQ_NAME_LEN]; + u64 t_max; + unsigned int ct; +}; + +struct Ihandler { + int front; + int num; + struct irq_handler_info info[IHANDLER_INFO_NUM_MAX]; +}; + +#ifdef CONFIG_ITRACE_IHANDLER +extern void itrace_ihandler_entry(void); +extern void itrace_ihandler_exit(int irq, const char *name); +extern void itrace_ihandler_set(u64 set); +extern void itrace_ihandler_get(struct Ihandler *ih, int cpu); +extern void itrace_ihandler_num_set(int set); +extern int itrace_ihandler_num_get(void); +#else +static inline void __maybe_unused itrace_ihandler_entry(void) +{ +}; +static inline void __maybe_unused itrace_ihandler_exit(int irq, const char *name) +{ +}; +#endif /* CONFIG_ITRACE_IHANDLER */ + +#endif /* __LINUX_ITRACE_H */ diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index 38554bc353755..95caa394df603 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -13,6 +13,7 @@ #include <linux/sched.h> #include <linux/interrupt.h> #include <linux/kernel_stat.h> +#include <linux/itrace.h> #include <trace/events/irq.h> @@ -146,7 +147,9 @@ irqreturn_t __handle_irq_event_percpu(struct irq_desc *desc, unsigned int *flags irqreturn_t res; trace_irq_handler_entry(irq, action); + itrace_ihandler_entry(); res = action->handler(irq, action->dev_id); + itrace_ihandler_exit(irq, action->name); trace_irq_handler_exit(irq, action, res); if (WARN_ONCE(!irqs_disabled(),"irq %u handler %pF enabled interrupts\n", diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c index e8c655b7a4308..1d5b4b0154720 100644 --- a/kernel/irq/proc.c +++ b/kernel/irq/proc.c @@ -12,6 +12,7 @@ #include <linux/interrupt.h> #include <linux/kernel_stat.h> #include <linux/mutex.h> +#include <linux/itrace.h> #include "internals.h" @@ -299,6 +300,99 @@ static int irq_node_proc_show(struct seq_file *m, void *v) } #endif +#ifdef CONFIG_ITRACE_IHANDLER +static int itrace_ihandler_num_show(struct seq_file *m, void *v) +{ + seq_printf(m, "%d\n", itrace_ihandler_num_get()); + + return 0; +} + +static ssize_t itrace_ihandler_num_write(struct file *file, + const char __user *buffer, size_t count, loff_t *ppos) +{ + int ret; + int num; + + ret = kstrtoint_from_user(buffer, count, 10, &num); + if (ret) + return ret; + + if (num > IHANDLER_INFO_NUM_MAX || num < IHANDLER_INFO_NUM_MIN) + return -EINVAL; + + itrace_ihandler_num_set(num); + + return count; +} + +static int itrace_ihandler_num_open(struct inode *inode, struct file *file) +{ + return single_open(file, itrace_ihandler_num_show, PDE_DATA(inode)); +} + +static const struct file_operations itrace_ihandler_num_proc_fops = { + .open = itrace_ihandler_num_open, + .read = seq_read, + .release = single_release, + .write = itrace_ihandler_num_write, +}; + +static int itrace_ihandler_show(struct seq_file *m, void *v) +{ + unsigned int i, j; + struct Ihandler ihandler; + int online_cpus = num_online_cpus(); + + for (i = 0; i < online_cpus; i++) { + itrace_ihandler_get(&ihandler, i); + + /* print nothing while num is 0 */ + if (ihandler.num == 0) + return 0; + + seq_printf(m, "[irq_handler CPU%d]:\n", i); + for (j = 0; j < ihandler.num; j++) + seq_printf(m, " irq:%d name:%s max_time:%llu(us) count:%u\n", + ihandler.info[j].irq, ihandler.info[j].name, + ihandler.info[j].t_max / NSEC_PER_USEC, + ihandler.info[j].ct); + } + + return 0; +} + +static ssize_t itrace_ihandler_write(struct file *file, + const char __user *buffer, size_t count, loff_t *ppos) +{ + int ret; + u64 val; + + ret = kstrtoull_from_user(buffer, count, 10, &val); + if (ret) + return ret; + + if (val > IHANDLER_THRESHOLD_MAX) + return -EINVAL; + + itrace_ihandler_set(val); + + return count; +} + +static int itrace_ihandler_open(struct inode *inode, struct file *file) +{ + return single_open(file, itrace_ihandler_show, PDE_DATA(inode)); +} + +static const struct file_operations itrace_ihandler_proc_fops = { + .open = itrace_ihandler_open, + .read = seq_read, + .release = single_release, + .write = itrace_ihandler_write, +}; +#endif + static int irq_spurious_proc_show(struct seq_file *m, void *v) { struct irq_desc *desc = irq_to_desc((long) m->private); @@ -458,6 +552,12 @@ void init_irq_proc(void) */ for_each_irq_desc(irq, desc) register_irq_proc(irq, desc); +#ifdef CONFIG_ITRACE_IHANDLER + proc_create("irq/itrace_ihandler", 0644, NULL, + &itrace_ihandler_proc_fops); + proc_create("irq/itrace_ihandler_num", 0644, NULL, + &itrace_ihandler_num_proc_fops); +#endif } #ifdef CONFIG_GENERIC_IRQ_SHOW diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index e656d1e232da4..5dd2e37f1aae0 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -788,5 +788,27 @@ config GCOV_PROFILE_FTRACE endif # FTRACE +menuconfig ITRACE + bool "Itrace Support" + help + Itrace(Interrupt Tracing) is a lightweight interrupt tracing + tool. + It can trace the areas that interrupt handler function and + disable interrupts. + +if ITRACE + +config ITRACE_IHANDLER + bool "Support for tracing the interrupt handler function" + default n + help + Ihandler(Interrupt Handler) tracer can trace and calculate + the time consumed of the hardware irq function and list the + name, number and duration of the interrupt. + + Support dynamic disable and threshold setting. + +endif #ITRACE + endif # TRACING_SUPPORT diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile index f81dadbc7c4ac..231ce3c22ea4e 100644 --- a/kernel/trace/Makefile +++ b/kernel/trace/Makefile @@ -84,3 +84,5 @@ obj-$(CONFIG_UPROBE_EVENTS) += trace_uprobe.o obj-$(CONFIG_TRACEPOINT_BENCHMARK) += trace_benchmark.o libftrace-y := ftrace.o + +obj-$(CONFIG_ITRACE_IHANDLER) += itrace_ihandler.o diff --git a/kernel/trace/itrace_ihandler.c b/kernel/trace/itrace_ihandler.c new file mode 100644 index 0000000000000..906e2e0b1a0f8 --- /dev/null +++ b/kernel/trace/itrace_ihandler.c @@ -0,0 +1,154 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright(c) 2021 Huawei Technologies Co., Ltd + * Author: Bixuan Cui <cuibixuan(a)huawei.com> + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/timer.h> +#include <linux/jiffies.h> +#include <linux/sched/clock.h> +#include <linux/itrace.h> +#include <linux/time64.h> + +static u64 threshold_value; +static int ihandler_info_num = 5; +static int ihandler_enable; + +static DEFINE_PER_CPU(struct Ihandler, ihandler); +static DEFINE_PER_CPU(u64, ihandler_entry); + +/* Per-cpu variable to prevent redundant calls when already entry handler */ +static DEFINE_PER_CPU(int, ihandle_flag); + +void itrace_ihandler_entry(void) +{ + if (ihandler_enable == IHANDLER_OFF) + return; + + if (!this_cpu_read(ihandle_flag)) { + this_cpu_write(ihandle_flag, 1); + + this_cpu_write(ihandler_entry, sched_clock()); + } +} + +static void itrace_insert_diff(int cpu, u64 diff, int irq, const char *name) +{ + int j, index, find = 0; + char *ihandler_name; + unsigned int ct; + u64 t_max; + int front = per_cpu(ihandler, cpu).front; + int num = per_cpu(ihandler, cpu).num; + + for (j = 0; j < num; j++) { + index = (front + j) % num; + if (per_cpu(ihandler, cpu).info[index].irq == irq) { + find = 1; + break; + } + } + + if (find != 0) { + t_max = per_cpu(ihandler, cpu).info[index].t_max; + ct = per_cpu(ihandler, cpu).info[index].ct + 1; + + per_cpu(ihandler, cpu).info[index].t_max = diff > t_max ? + diff : t_max; + per_cpu(ihandler, cpu).info[index].ct = ct > + IHANDLER_INFO_CT_MAX ? IHANDLER_INFO_CT_MAX : ct; + } else { + num = num + 1; + ihandler_name = per_cpu(ihandler, cpu).info[front].name; + + per_cpu(ihandler, cpu).info[front].irq = irq; + strncpy(ihandler_name, name, IRQ_NAME_LEN - 1); + ihandler_name[IRQ_NAME_LEN - 1] = '\0'; + per_cpu(ihandler, cpu).info[front].t_max = diff; + per_cpu(ihandler, cpu).front = (front + 1) % + ihandler_info_num; + per_cpu(ihandler, cpu).num = num > ihandler_info_num ? + ihandler_info_num : num; + per_cpu(ihandler, cpu).info[front].ct += 1; + + } +} + +void itrace_ihandler_exit(int irq, const char *name) +{ + u64 diff; + int cpu; + + if (ihandler_enable == IHANDLER_OFF) + return; + + if (this_cpu_read(ihandle_flag)) { + cpu = smp_processor_id(); + diff = sched_clock() - per_cpu(ihandler_entry, cpu); + + if (diff > threshold_value) + itrace_insert_diff(cpu, diff, irq, name); + + this_cpu_write(ihandle_flag, 0); + } +} + +void itrace_ihandler_set(u64 set) +{ + unsigned int i, j; + int online_cpus = num_online_cpus(); + + /* disable tracer and update threshold_value first */ + ihandler_enable = IHANDLER_OFF; + threshold_value = set * NSEC_PER_USEC; + + for (i = 0; i < online_cpus; i++) { + + per_cpu(ihandler, i).front = 0; + per_cpu(ihandler, i).num = 0; + for (j = 0; j < IHANDLER_INFO_NUM_MAX; j++) { + per_cpu(ihandler, i).info[j].irq = 0; + per_cpu(ihandler, i).info[j].name[0] = '\0'; + per_cpu(ihandler, i).info[j].t_max = 0; + per_cpu(ihandler, i).info[j].ct = 0; + } + + /* enable tracer */ + if (set != 0) { + per_cpu(ihandle_flag, i) = 0; + ihandler_enable = IHANDLER_ON; + } + } +} + +void itrace_ihandler_get(struct Ihandler *ih, int cpu) +{ + unsigned int j; + char *ihandler_name; + + for (j = 0; j < ihandler_info_num; j++) { + ihandler_name = per_cpu(ihandler, cpu).info[j].name; + + ih->num = per_cpu(ihandler, cpu).num; + ih->info[j].irq = per_cpu(ihandler, cpu).info[j].irq; + strncpy(ih->info[j].name, ihandler_name, IRQ_NAME_LEN); + ih->info[j].t_max = per_cpu(ihandler, cpu).info[j].t_max; + ih->info[j].ct = per_cpu(ihandler, cpu).info[j].ct; + } +} + +void itrace_ihandler_num_set(int set) +{ + ihandler_info_num = set; + + /* clear ihandler of per cpu while reset info_num */ + itrace_ihandler_set(threshold_value / NSEC_PER_USEC); +} + +int itrace_ihandler_num_get(void) +{ + return ihandler_info_num; +} -- 2.25.1

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[PATCH kernel-4.19 1/3] itrace: Add irqsoff trace support
by Yang Yingliang 18 May '21

18 May '21

From: Bixuan Cui <cuibixuan(a)huawei.com> ascend inclusion category: feature bugzilla: NA CVE: NA --------------------------------------------- Add Irqsoff tracer into itrace to trace the areas that disable interrupts Irqsoff supports dynamic disable and threshold setting. Signed-off-by: Bixuan Cui <cuibixuan(a)huawei.com> Reviewed-by: Ding Tianhong <dingtianhong(a)huawei.com> Reviewed-by: Hanjun Guo <guohanjun(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- include/linux/irqflags.h | 46 +++++++++++- include/linux/itrace.h | 31 ++++++++ kernel/irq/proc.c | 98 +++++++++++++++++++++++++ kernel/trace/Kconfig | 11 +++ kernel/trace/Makefile | 1 + kernel/trace/itrace_irqsoff.c | 132 ++++++++++++++++++++++++++++++++++ 6 files changed, 317 insertions(+), 2 deletions(-) create mode 100644 kernel/trace/itrace_irqsoff.c diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h index 21619c92c3770..18f674deeb726 100644 --- a/include/linux/irqflags.h +++ b/include/linux/irqflags.h @@ -14,6 +14,7 @@ #include <linux/typecheck.h> #include <asm/irqflags.h> +#include <linux/itrace.h> /* Currently trace_softirqs_on/off is used only by lockdep */ #ifdef CONFIG_PROVE_LOCKING @@ -69,7 +70,11 @@ do { \ extern void stop_critical_timings(void); extern void start_critical_timings(void); #else +#ifdef CONFIG_ITRACE_IRQSOFF +# define stop_critical_timings() itrace_hardirqs_ignore() +#else # define stop_critical_timings() do { } while (0) +#endif # define start_critical_timings() do { } while (0) #endif @@ -135,7 +140,44 @@ do { \ } while (0) -#else /* !CONFIG_TRACE_IRQFLAGS */ +#elif defined(CONFIG_ITRACE_IRQSOFF) /* CONFIG_ITRACE_IRQSOFF */ + +#define local_irq_enable() \ + do { \ + itrace_hardirqs_on(); \ + raw_local_irq_enable(); \ + } while (0) + +#define local_irq_disable() \ + do { \ + raw_local_irq_disable(); \ + itrace_hardirqs_off(); \ + } while (0) + +#define local_irq_save(flags) \ + do { \ + raw_local_irq_save(flags); \ + itrace_hardirqs_off(); \ + } while (0) + +#define local_irq_restore(flags) \ + do { \ + if (raw_irqs_disabled_flags(flags)) { \ + raw_local_irq_restore(flags); \ + itrace_hardirqs_off(); \ + } else { \ + itrace_hardirqs_on(); \ + raw_local_irq_restore(flags); \ + } \ + } while (0) + +#define safe_halt() \ + do { \ + itrace_hardirqs_on(); \ + raw_safe_halt(); \ + } while (0) + +#else #define local_irq_enable() do { raw_local_irq_enable(); } while (0) #define local_irq_disable() do { raw_local_irq_disable(); } while (0) @@ -146,7 +188,7 @@ do { \ #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) #define safe_halt() do { raw_safe_halt(); } while (0) -#endif /* CONFIG_TRACE_IRQFLAGS */ +#endif /* CONFIG_TRACE_IRQFLAGS && CONFIG_ITRACE_IRQFLAGS */ #define local_save_flags(flags) raw_local_save_flags(flags) diff --git a/include/linux/itrace.h b/include/linux/itrace.h index d7916581e03f2..aba6396857b38 100644 --- a/include/linux/itrace.h +++ b/include/linux/itrace.h @@ -15,6 +15,13 @@ #define IHANDLER_OFF 0 #define IHANDLER_ON 1 +#define CALLER_FUNC_LEN 50 +#define IRQSOFF_INFO_NUM_MIN 1 +#define IRQSOFF_INFO_NUM_MAX 30 +#define IRQSOFF_THRESHOLD_MAX 10000000 +#define IRQSOFF_OFF 0 +#define IRQSOFF_ON 1 + struct irq_handler_info { int irq; char name[IRQ_NAME_LEN]; @@ -28,6 +35,17 @@ struct Ihandler { struct irq_handler_info info[IHANDLER_INFO_NUM_MAX]; }; +struct irqsoff_info { + u64 t_max; + char caller[CALLER_FUNC_LEN]; +}; + +struct Irqsoff { + int front; + int num; + struct irqsoff_info info[IRQSOFF_INFO_NUM_MAX]; +}; + #ifdef CONFIG_ITRACE_IHANDLER extern void itrace_ihandler_entry(void); extern void itrace_ihandler_exit(int irq, const char *name); @@ -44,4 +62,17 @@ static inline void __maybe_unused itrace_ihandler_exit(int irq, const char *name }; #endif /* CONFIG_ITRACE_IHANDLER */ +#ifdef CONFIG_ITRACE_IRQSOFF +extern void itrace_hardirqs_on(void); +extern void itrace_hardirqs_off(void); +extern void itrace_hardirqs_ignore(void); +extern void itrace_irqsoff_set(u64 set); +extern void itrace_irqsoff_get(struct Irqsoff *is, int cpu); +extern void itrace_irqsoff_num_set(int set); +extern int itrace_irqsoff_num_get(void); +#else +# define itrace_hardirqs_on() do { } while (0) +# define itrace_hardirqs_on() do { } while (0) +#endif /* CONFIG_ITRACE_IRQSOFF */ + #endif /* __LINUX_ITRACE_H */ diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c index 1d5b4b0154720..1d50b5b855d21 100644 --- a/kernel/irq/proc.c +++ b/kernel/irq/proc.c @@ -393,6 +393,98 @@ static const struct file_operations itrace_ihandler_proc_fops = { }; #endif +#ifdef CONFIG_ITRACE_IRQSOFF +static int itrace_irqsoff_num_show(struct seq_file *m, void *v) +{ + seq_printf(m, "%d\n", itrace_irqsoff_num_get()); + + return 0; +} + +static ssize_t itrace_irqsoff_num_write(struct file *file, + const char __user *buffer, size_t count, loff_t *ppos) +{ + int ret; + int num; + + ret = kstrtoint_from_user(buffer, count, 10, &num); + if (ret) + return ret; + + if (num > IRQSOFF_INFO_NUM_MAX || num < IRQSOFF_INFO_NUM_MIN) + return -EINVAL; + + itrace_irqsoff_num_set(num); + + return count; +} + +static int itrace_irqsoff_num_open(struct inode *inode, struct file *file) +{ + return single_open(file, itrace_irqsoff_num_show, PDE_DATA(inode)); +} + +static const struct file_operations itrace_irqsoff_num_proc_fops = { + .open = itrace_irqsoff_num_open, + .read = seq_read, + .release = single_release, + .write = itrace_irqsoff_num_write, +}; + +static int itrace_irqsoff_show(struct seq_file *m, void *v) +{ + unsigned int i, j; + int online_cpus = num_online_cpus(); + struct Irqsoff irqsoff; + + for (i = 0; i < online_cpus; i++) { + itrace_irqsoff_get(&irqsoff, i); + + /* print nothing while num is 0 */ + if (irqsoff.num == 0) + continue; + + seq_printf(m, "[irqsoff CPU%d]:\n", i); + for (j = 0; j < irqsoff.num; j++) + seq_printf(m, " max_time:%llu(us) caller:%s\n", + irqsoff.info[j].t_max / NSEC_PER_USEC, + irqsoff.info[j].caller); + } + + return 0; +} + +static ssize_t itrace_irqsoff_write(struct file *file, + const char __user *buffer, size_t count, loff_t *ppos) +{ + int ret; + u64 val; + + ret = kstrtoull_from_user(buffer, count, 10, &val); + if (ret) + return ret; + + if (val > IRQSOFF_THRESHOLD_MAX) + return -EINVAL; + + itrace_irqsoff_set(val); + + return count; +} + +static int itrace_irqsoff_open(struct inode *inode, struct file *file) +{ + return single_open(file, itrace_irqsoff_show, PDE_DATA(inode)); +} + +static const struct file_operations itrace_irqsoff_proc_fops = { + .open = itrace_irqsoff_open, + .read = seq_read, + .release = single_release, + .write = itrace_irqsoff_write, +}; +#endif + static int irq_spurious_proc_show(struct seq_file *m, void *v) { struct irq_desc *desc = irq_to_desc((long) m->private); @@ -558,6 +650,12 @@ void init_irq_proc(void) proc_create("irq/itrace_ihandler_num", 0644, NULL, &itrace_ihandler_num_proc_fops); #endif +#ifdef CONFIG_ITRACE_IRQSOFF + proc_create("irq/itrace_irqsoff", 0644, NULL, + &itrace_irqsoff_proc_fops); + proc_create("irq/itrace_irqsoff_num", 0644, NULL, + &itrace_irqsoff_num_proc_fops); +#endif } #ifdef CONFIG_GENERIC_IRQ_SHOW diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index 5dd2e37f1aae0..36d4ded6ae74b 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -808,6 +808,17 @@ config ITRACE_IHANDLER Support dynamic disable and threshold setting. +config ITRACE_IRQSOFF + bool "Support for tracing the irqsoff" + depends on !TRACE_IRQFLAGS && !IRQSOFF_TRACER && !PREEMPT_TRACER + default n + help + Irqsoff tracer is a lightweight tracing tool. It can trace + the areas that disable interrupts and saves the trace with + the latency. + + Support dynamic disable and threshold setting. + endif #ITRACE endif # TRACING_SUPPORT diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile index 231ce3c22ea4e..c0e8ed93adf28 100644 --- a/kernel/trace/Makefile +++ b/kernel/trace/Makefile @@ -86,3 +86,4 @@ obj-$(CONFIG_TRACEPOINT_BENCHMARK) += trace_benchmark.o libftrace-y := ftrace.o obj-$(CONFIG_ITRACE_IHANDLER) += itrace_ihandler.o +obj-$(CONFIG_ITRACE_IRQSOFF) += itrace_irqsoff.o diff --git a/kernel/trace/itrace_irqsoff.c b/kernel/trace/itrace_irqsoff.c new file mode 100644 index 0000000000000..15444755de712 --- /dev/null +++ b/kernel/trace/itrace_irqsoff.c @@ -0,0 +1,132 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright(c) 2021 Huawei Technologies Co., Ltd + * Author: Bixuan Cui <cuibixuan(a)huawei.com> + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/timer.h> +#include <linux/jiffies.h> +#include <linux/sched/clock.h> +#include <linux/itrace.h> + +static u64 threshold_value; +static int irqsoff_info_num = 3; +static int irqsoff_enable; + +static DEFINE_PER_CPU(struct Irqsoff, irqsoff); +static DEFINE_PER_CPU(u64, irqsoff_off); + +/* Per-cpu variable to prevent redundant calls when IRQs already off */ +static DEFINE_PER_CPU(u64, irqsoff_flag); + +void itrace_hardirqs_on(void) +{ + u64 diff; + int front, cpu, num; + char *caller; + + if (irqsoff_enable == IRQSOFF_OFF) + return; + + if (this_cpu_read(irqsoff_flag)) { + cpu = smp_processor_id(); + diff = sched_clock() - per_cpu(irqsoff_off, cpu); + + if (diff > threshold_value) { + front = per_cpu(irqsoff, cpu).front; + num = per_cpu(irqsoff, cpu).num + 1; + caller = per_cpu(irqsoff, cpu).info[front].caller; + + per_cpu(irqsoff, cpu).info[front].t_max = diff; + snprintf(caller, CALLER_FUNC_LEN, "%pS", + __builtin_return_address(0)); + + per_cpu(irqsoff, cpu).front = (front + 1) % + irqsoff_info_num; + per_cpu(irqsoff, cpu).num = num > irqsoff_info_num ? + irqsoff_info_num : num; + } + + this_cpu_write(irqsoff_flag, 0); + } +} +EXPORT_SYMBOL(itrace_hardirqs_on); + +void itrace_hardirqs_off(void) +{ + if (irqsoff_enable == IRQSOFF_OFF) + return; + + if (!this_cpu_read(irqsoff_flag)) { + this_cpu_write(irqsoff_flag, 1); + + this_cpu_write(irqsoff_off, sched_clock()); + } +} +EXPORT_SYMBOL(itrace_hardirqs_off); + +void itrace_hardirqs_ignore(void) +{ + if (irqsoff_enable == IRQSOFF_OFF) + return; + + if (this_cpu_read(irqsoff_flag)) + this_cpu_write(irqsoff_flag, 0); +} +EXPORT_SYMBOL(itrace_hardirqs_ignore); + +void itrace_irqsoff_set(u64 set) +{ + unsigned int i, j; + int online_cpus = num_online_cpus(); + + /* disable tracer and update threshold_value first */ + irqsoff_enable = IRQSOFF_OFF; + threshold_value = set * NSEC_PER_USEC; + + for (i = 0; i < online_cpus; i++) { + + per_cpu(irqsoff, i).front = 0; + per_cpu(irqsoff, i).num = 0; + for (j = 0; j < IRQSOFF_INFO_NUM_MAX; j++) { + per_cpu(irqsoff, i).info[j].t_max = 0; + per_cpu(irqsoff, i).info[j].caller[0] = '\0'; + } + + /* enable tracer */ + if (set != 0) { + per_cpu(irqsoff_flag, i) = 0; + irqsoff_enable = IRQSOFF_ON; + } + } +} + +void itrace_irqsoff_get(struct Irqsoff *is, int cpu) +{ + unsigned int j; + char *caller; + + for (j = 0; j < irqsoff_info_num; j++) { + caller = per_cpu(irqsoff, cpu).info[j].caller; + + is->num = per_cpu(irqsoff, cpu).num; + is->info[j].t_max = per_cpu(irqsoff, cpu).info[j].t_max; + strncpy(is->info[j].caller, caller, CALLER_FUNC_LEN); + } +} + +void itrace_irqsoff_num_set(int set) +{ + irqsoff_info_num = set; + + /* clear irqsoff.num while reset info_num */ + itrace_irqsoff_set(threshold_value / NSEC_PER_USEC); +} + +int itrace_irqsoff_num_get(void) +{ + return irqsoff_info_num; +} -- 2.25.1

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Fwd: openEuler Developer Day 启动大会招募环节，报名通道同步开启！
by Marketing openEuler 17 May '21

17 May '21

openEuler 社区的开发者：您好！ openEuler Developer Day 2021 将于*6**月10日*在北京举行。本次大会是由 openEuler 社区发起，主要面向签署了 CLA的核心开发者、南北向生态厂商以及核心用户的一场技术盛会，旨在推动 openEuler 社区在多样性计算、云原生全栈、全场景协同等技术方向的持续探索和创新。 *开放招募* openEuler Developer Day 正式开放招募环节：*Call for Speaker* <https://shimo.im/forms/KgXxt8JCYKYtVXHx/fill>、*Call for Sponsor* <https://shimo.im/forms/vwCC68q3pQvvR3Yc/fill>、*Call for SIG* <https://shimo.im/forms/x6vXyW8QHCGK9QJD/fill>、*Call for Demo* <https://shimo.im/forms/PQTvWKjHgg96DjD8/fill> 欢迎 openEuler 社区的开发者提交以上四个方面的材料。 [image: 截屏2021-05-13 下午8.12.43.png] *大会亮点* 这是一场大型的面向 openEuler 社区开发者的技术交流会议。在现场共同探讨*热点技术方向*和*如何参与社区贡献*，通过大会*公开接收用户需求*，*完成版本规划*。 *技术委员会*、*品牌委员会*、*用户委员会*、*20个 SIG 组*会同期举办*开放工作会议**（仅限签署社区 CLA 的开发者参加）*。技术委员会主席给大家解读 *openEuler 21.03*，发布下个社区版的*技术定位*，分享社区创新思路。来自互联网、金融、运营商的客户分享成功的应用实践经验。开源圆桌中，客户、伙伴、厂商、研究机构一同探究开源软件供应链的意义和风险，开源模式如何推动独立演进操作系统技术的发展。更有开发者心心念念的 *Party* 心动不如行动，赶紧来报名参会 <https://e-campaign.huawei.com/m/mIzQFr>吧！！！

1 0

[PATCH openEuler-1.0-LTS] bcache: add readahead cache policy options via sysfs interface
by Cheng Jian 17 May '21

17 May '21

From: Coly Li <colyli(a)suse.de> mainline inclusion from mainline-v5.6-rc1 commit 038ba8cc1bffc51250add4a9b9249d4331576d8f category: bugfix bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=26 CVE: NA ----------------------------------------------- In year 2007 high performance SSD was still expensive, in order to save more space for real workload or meta data, the readahead I/Os for non-meta data was bypassed and not cached on SSD. In now days, SSD price drops a lot and people can find larger size SSD with more comfortable price. It is unncessary to alway bypass normal readahead I/Os to save SSD space for now. This patch adds options for readahead data cache policies via sysfs file /sys/block/bcache<N>/readahead_cache_policy, the options are, - "all": cache all readahead data I/Os. - "meta-only": only cache meta data, and bypass other regular I/Os. If users want to make bcache continue to only cache readahead request for metadata and bypass regular data readahead, please set "meta-only" to this sysfs file. By default, bcache will back to cache all read- ahead requests now. Cc: stable(a)vger.kernel.org Signed-off-by: Coly Li <colyli(a)suse.de> Acked-by: Eric Wheeler <bcache(a)linux.ewheeler.net> Cc: Michael Lyle <mlyle(a)lyle.org> Signed-off-by: Jens Axboe <axboe(a)kernel.dk> Signed-off-by: Li Ruilin <liruilin4(a)huawei.com> Reviewed-by: Peng Junyi <pengjunyi1(a)huawei.com> Signed-off-by: Cheng Jian <cj.chengjian(a)huawei.com> --- drivers/md/bcache/bcache.h | 3 +++ drivers/md/bcache/request.c | 17 ++++++++++++----- drivers/md/bcache/sysfs.c | 22 ++++++++++++++++++++++ 3 files changed, 37 insertions(+), 5 deletions(-) diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h index a70600a38a70..99d12fce876b 100644 --- a/drivers/md/bcache/bcache.h +++ b/drivers/md/bcache/bcache.h @@ -332,6 +332,9 @@ struct cached_dev { */ atomic_t has_dirty; +#define BCH_CACHE_READA_ALL 0 +#define BCH_CACHE_READA_META_ONLY 1 + unsigned int cache_readahead_policy; struct bch_ratelimit writeback_rate; struct delayed_work writeback_rate_update; diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c index 2beab94504bb..6d89e56a4a41 100644 --- a/drivers/md/bcache/request.c +++ b/drivers/md/bcache/request.c @@ -401,13 +401,20 @@ static bool check_should_bypass(struct cached_dev *dc, struct bio *bio) goto skip; /* - * Flag for bypass if the IO is for read-ahead or background, - * unless the read-ahead request is for metadata + * If the bio is for read-ahead or background IO, bypass it or + * not depends on the following situations, + * - If the IO is for meta data, always cache it and no bypass + * - If the IO is not meta data, check dc->cache_reada_policy, + * BCH_CACHE_READA_ALL: cache it and not bypass + * BCH_CACHE_READA_META_ONLY: not cache it and bypass + * That is, read-ahead request for metadata always get cached * (eg, for gfs2 or xfs). */ - if (bio->bi_opf & (REQ_RAHEAD|REQ_BACKGROUND) && - !(bio->bi_opf & (REQ_META|REQ_PRIO))) - goto skip; + if ((bio->bi_opf & (REQ_RAHEAD|REQ_BACKGROUND))) { + if (!(bio->bi_opf & (REQ_META|REQ_PRIO)) && + (dc->cache_readahead_policy != BCH_CACHE_READA_ALL)) + goto skip; + } if (bio->bi_iter.bi_sector & (c->sb.block_size - 1) || bio_sectors(bio) & (c->sb.block_size - 1)) { diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c index e61924fdeaed..706d3a245dba 100644 --- a/drivers/md/bcache/sysfs.c +++ b/drivers/md/bcache/sysfs.c @@ -26,6 +26,12 @@ static const char * const bch_cache_modes[] = { }; /* Default is -1; we skip past it for stop_when_cache_set_failed */ +static const char * const bch_reada_cache_policies[] = { + "all", + "meta-only", + NULL +}; + static const char * const bch_stop_on_failure_modes[] = { "auto", "always", @@ -96,6 +102,7 @@ rw_attribute(read_bypass); rw_attribute(inflight_block_enable); rw_attribute(data_csum); rw_attribute(cache_mode); +rw_attribute(readahead_cache_policy); rw_attribute(stop_when_cache_set_failed); rw_attribute(writeback_metadata); rw_attribute(writeback_running); @@ -162,6 +169,11 @@ SHOW(__bch_cached_dev) bch_cache_modes, BDEV_CACHE_MODE(&dc->sb)); + if (attr == &sysfs_readahead_cache_policy) + return bch_snprint_string_list(buf, PAGE_SIZE, + bch_reada_cache_policies, + dc->cache_readahead_policy); + if (attr == &sysfs_stop_when_cache_set_failed) return bch_snprint_string_list(buf, PAGE_SIZE, bch_stop_on_failure_modes, @@ -334,6 +346,15 @@ STORE(__cached_dev) } } + if (attr == &sysfs_readahead_cache_policy) { + v = __sysfs_match_string(bch_reada_cache_policies, -1, buf); + if (v < 0) + return v; + + if ((unsigned int) v != dc->cache_readahead_policy) + dc->cache_readahead_policy = v; + } + if (attr == &sysfs_stop_when_cache_set_failed) { v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf); if (v < 0) @@ -427,6 +448,7 @@ static struct attribute *bch_cached_dev_files[] = { &sysfs_data_csum, #endif &sysfs_cache_mode, + &sysfs_readahead_cache_policy, &sysfs_stop_when_cache_set_failed, &sysfs_writeback_metadata, &sysfs_writeback_running, -- 2.25.1

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[PATCH kernel-4.19] mm/page_alloc: fix managed_pages of zone is incorrect and out of bounds
by Yang Yingliang 17 May '21

17 May '21

From: Guo Hui <guohui(a)uniontech.com> uniontech inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I3RFV8 CVE: NA ---------------------------------------------------------------- Commit eb761d6521c3 ("mm: parallelize deferred struct page initialization within each node") the code "++zone" in follow code: /* Sanity check that the next zone really is unpopulated */ WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone)); VM_BUG_ON(nr_init != nr_free); zone->managed_pages += nr_free; makes the managed_pages statistics of the current zone incorrect and the zone may have out-of-bounds memory when CONFIG_DEFERRED_STRUCT_PAGE_INIT=y, causing the Virtual machine system startup to fail when the Virtual machine system current allocated memory is set to half of the Virtual machine maximum memory using virt-manager tool Fix it by putting the code “zone->managed_pages += nr_free;” before “++zone” code Fixes: eb761d6521c3 ("mm: parallelize deferred struct page initialization within each node") Reported-by: Peng Yuanbo <pengyuanbo(a)uniontech.com> Signed-off-by: Guo Hui <guohui(a)uniontech.com> Reviewed-by: Kefeng Wang <wangkefeng.wang(a)huawei.com> Signed-off-by: Cheng Jian <cj.chengjian(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> --- mm/page_alloc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index cdd8ff4350ba7..d2012e07e5295 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1688,12 +1688,13 @@ static int __init deferred_init_memmap(void *data) nr_free += atomic64_read(&args.nr_pages); } - /* Sanity check that the next zone really is unpopulated */ - WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone)); VM_BUG_ON(nr_init != nr_free); zone->managed_pages += nr_free; + /* Sanity check that the next zone really is unpopulated */ + WARN_ON(++zid < MAX_NR_ZONES && populated_zone(++zone)); + pr_info("node %d initialised, %lu pages in %ums\n", nid, nr_free, jiffies_to_msecs(jiffies - start)); -- 2.25.1

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