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authorNamhyung Kim <namhyung@kernel.org>2022-09-16 11:41:30 -0700
committerArnaldo Carvalho de Melo <acme@redhat.com>2022-09-21 10:30:55 -0300
commit3da35231d9e4949c4ae40e3ce653e7c468455d55 (patch)
tree285b1d6a0e0bd881018d62729498bd728d336fed /tools/perf
parent0d77326c3369e255715ed2440a78894ccc98dd69 (diff)
perf stat: Fix cpu map index in bperf cgroup code
The previous cpu map introduced a bug in the bperf cgroup counter. This results in a failure when user gives a partial cpu map starting from non-zero. $ sudo ./perf stat -C 1-2 --bpf-counters --for-each-cgroup ^. sleep 1 libbpf: prog 'on_cgrp_switch': failed to create BPF link for perf_event FD 0: -9 (Bad file descriptor) Failed to attach cgroup program To get the FD of an evsel, it should use a map index not the CPU number. Fixes: 0255571a16059c8e ("perf cpumap: Switch to using perf_cpu_map API") Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: bpf@vger.kernel.org Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/r/20220916184132.1161506-3-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/util/bpf_counter_cgroup.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/perf/util/bpf_counter_cgroup.c b/tools/perf/util/bpf_counter_cgroup.c
index 63b9db657442..97c69a249c6e 100644
--- a/tools/perf/util/bpf_counter_cgroup.c
+++ b/tools/perf/util/bpf_counter_cgroup.c
@@ -95,7 +95,7 @@ static int bperf_load_program(struct evlist *evlist)
perf_cpu_map__for_each_cpu(cpu, i, evlist->core.all_cpus) {
link = bpf_program__attach_perf_event(skel->progs.on_cgrp_switch,
- FD(cgrp_switch, cpu.cpu));
+ FD(cgrp_switch, i));
if (IS_ERR(link)) {
pr_err("Failed to attach cgroup program\n");
err = PTR_ERR(link);
@@ -123,7 +123,7 @@ static int bperf_load_program(struct evlist *evlist)
map_fd = bpf_map__fd(skel->maps.events);
perf_cpu_map__for_each_cpu(cpu, j, evlist->core.all_cpus) {
- int fd = FD(evsel, cpu.cpu);
+ int fd = FD(evsel, j);
__u32 idx = evsel->core.idx * total_cpus + cpu.cpu;
err = bpf_map_update_elem(map_fd, &idx, &fd,