From: Song Liu <song@kernel.org> Introduce bpf_counter_ops->disable(), which is used stop counting the event. Committer notes: Added a dummy bpf_counter__disable() to the python binding to avoid having 'perf test python' failing. bpf_counter isn't supported in the python binding. Signed-off-by: Song Liu <song@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Song Liu <songliubraving@fb.com> Cc: kernel-team@fb.com Link: https://lore.kernel.org/r/20210425214333.1090950-6-song@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/util/bpf_counter.c | 26 ++++++++++++++++++++++++++ tools/perf/util/bpf_counter.h | 7 +++++++ tools/perf/util/evlist.c | 4 ++++ tools/perf/util/python.c | 6 ++++++ 4 files changed, 43 insertions(+) diff --git a/tools/perf/util/bpf_counter.c b/tools/perf/util/bpf_counter.c index f179f5743025..ddb52f748c8e 100644 --- a/tools/perf/util/bpf_counter.c +++ b/tools/perf/util/bpf_counter.c @@ -215,6 +215,17 @@ static int bpf_program_profiler__enable(struct evsel *evsel) return 0; } +static int bpf_program_profiler__disable(struct evsel *evsel) +{ + struct bpf_counter *counter; + + list_for_each_entry(counter, &evsel->bpf_counter_list, list) { + assert(counter->skel != NULL); + bpf_prog_profiler_bpf__detach(counter->skel); + } + return 0; +} + static int bpf_program_profiler__read(struct evsel *evsel) { // perf_cpu_map uses /sys/devices/system/cpu/online @@ -280,6 +291,7 @@ static int bpf_program_profiler__install_pe(struct evsel *evsel, int cpu, struct bpf_counter_ops bpf_program_profiler_ops = { .load = bpf_program_profiler__load, .enable = bpf_program_profiler__enable, + .disable = bpf_program_profiler__disable, .read = bpf_program_profiler__read, .destroy = bpf_program_profiler__destroy, .install_pe = bpf_program_profiler__install_pe, @@ -627,6 +639,12 @@ static int bperf__enable(struct evsel *evsel) return 0; } +static int bperf__disable(struct evsel *evsel) +{ + evsel->follower_skel->bss->enabled = 0; + return 0; +} + static int bperf__read(struct evsel *evsel) { struct bperf_follower_bpf *skel = evsel->follower_skel; @@ -768,6 +786,7 @@ static int bperf__destroy(struct evsel *evsel) struct bpf_counter_ops bperf_ops = { .load = bperf__load, .enable = bperf__enable, + .disable = bperf__disable, .read = bperf__read, .install_pe = bperf__install_pe, .destroy = bperf__destroy, @@ -806,6 +825,13 @@ int bpf_counter__enable(struct evsel *evsel) return evsel->bpf_counter_ops->enable(evsel); } +int bpf_counter__disable(struct evsel *evsel) +{ + if (bpf_counter_skip(evsel)) + return 0; + return evsel->bpf_counter_ops->disable(evsel); +} + int bpf_counter__read(struct evsel *evsel) { if (bpf_counter_skip(evsel)) diff --git a/tools/perf/util/bpf_counter.h b/tools/perf/util/bpf_counter.h index 2eca210e5dc1..dac052b16ecf 100644 --- a/tools/perf/util/bpf_counter.h +++ b/tools/perf/util/bpf_counter.h @@ -18,6 +18,7 @@ typedef int (*bpf_counter_evsel_install_pe_op)(struct evsel *evsel, struct bpf_counter_ops { bpf_counter_evsel_target_op load; bpf_counter_evsel_op enable; + bpf_counter_evsel_op disable; bpf_counter_evsel_op read; bpf_counter_evsel_op destroy; bpf_counter_evsel_install_pe_op install_pe; @@ -32,6 +33,7 @@ struct bpf_counter { int bpf_counter__load(struct evsel *evsel, struct target *target); int bpf_counter__enable(struct evsel *evsel); +int bpf_counter__disable(struct evsel *evsel); int bpf_counter__read(struct evsel *evsel); void bpf_counter__destroy(struct evsel *evsel); int bpf_counter__install_pe(struct evsel *evsel, int cpu, int fd); @@ -51,6 +53,11 @@ static inline int bpf_counter__enable(struct evsel *evsel __maybe_unused) return 0; } +static inline int bpf_counter__disable(struct evsel *evsel __maybe_unused) +{ + return 0; +} + static inline int bpf_counter__read(struct evsel *evsel __maybe_unused) { return -EAGAIN; diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 13dca5cfd63a..7240469ee1d6 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -17,6 +17,7 @@ #include "evsel.h" #include "debug.h" #include "units.h" +#include "bpf_counter.h" #include <internal/lib.h> // page_size #include "affinity.h" #include "../perf.h" @@ -397,6 +398,9 @@ void evlist__disable(struct evlist *evlist) if (affinity__setup(&affinity) < 0) return; + evlist__for_each_entry(evlist, pos) + bpf_counter__disable(pos); + /* Disable 'immediate' events last */ for (imm = 0; imm <= 1; imm++) { evlist__for_each_cpu(evlist, i, cpu) { diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c index c3979b15863a..371fa74718b2 100644 --- a/tools/perf/util/python.c +++ b/tools/perf/util/python.c @@ -90,6 +90,7 @@ int metricgroup__copy_metric_events(struct evlist *evlist, struct cgroup *cgrp, */ void bpf_counter__destroy(struct evsel *evsel); int bpf_counter__install_pe(struct evsel *evsel, int cpu, int fd); +int bpf_counter__disable(struct evsel *evsel); void bpf_counter__destroy(struct evsel *evsel __maybe_unused) { @@ -100,6 +101,11 @@ int bpf_counter__install_pe(struct evsel *evsel __maybe_unused, int cpu __maybe_ return 0; } +int bpf_counter__disable(struct evsel *evsel __maybe_unused) +{ + return 0; +} + /* * Support debug printing even though util/debug.c is not linked. That means * implementing 'verbose' and 'eprintf'. -- 2.34.1