* [PATCH 1/2] perf tools: Add read_cgroup_id() function
@ 2021-06-13 20:19 Namhyung Kim
2021-06-13 20:20 ` [PATCH 2/2] perf stat: Enable BPF counter with --for-each-cgroup Namhyung Kim
0 siblings, 1 reply; 2+ messages in thread
From: Namhyung Kim @ 2021-06-13 20:19 UTC (permalink / raw
To: Arnaldo Carvalho de Melo, Jiri Olsa
Cc: Ingo Molnar, Peter Zijlstra, Mark Rutland, Alexander Shishkin,
LKML, Andi Kleen, Ian Rogers
The read_cgroup_id() is to read a cgroup id from a file handle using
name_to_handle_at(2) for the given cgroup. It'll be used by bperf
cgroup stat later.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/util/cgroup.c | 25 +++++++++++++++++++++++++
tools/perf/util/cgroup.h | 9 +++++++++
2 files changed, 34 insertions(+)
diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
index f24ab4585553..ef18c988c681 100644
--- a/tools/perf/util/cgroup.c
+++ b/tools/perf/util/cgroup.c
@@ -45,6 +45,31 @@ static int open_cgroup(const char *name)
return fd;
}
+#ifdef HAVE_FILE_HANDLE
+int read_cgroup_id(struct cgroup *cgrp)
+{
+ char path[PATH_MAX + 1];
+ char mnt[PATH_MAX + 1];
+ struct {
+ struct file_handle fh;
+ uint64_t cgroup_id;
+ } handle;
+ int mount_id;
+
+ if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1, "perf_event"))
+ return -1;
+
+ scnprintf(path, PATH_MAX, "%s/%s", mnt, cgrp->name);
+
+ handle.fh.handle_bytes = sizeof(handle.cgroup_id);
+ if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0)
+ return -1;
+
+ cgrp->id = handle.cgroup_id;
+ return 0;
+}
+#endif /* HAVE_FILE_HANDLE */
+
static struct cgroup *evlist__find_cgroup(struct evlist *evlist, const char *str)
{
struct evsel *counter;
diff --git a/tools/perf/util/cgroup.h b/tools/perf/util/cgroup.h
index 162906f3412a..707adbe25123 100644
--- a/tools/perf/util/cgroup.h
+++ b/tools/perf/util/cgroup.h
@@ -38,4 +38,13 @@ struct cgroup *cgroup__find(struct perf_env *env, uint64_t id);
void perf_env__purge_cgroups(struct perf_env *env);
+#ifdef HAVE_FILE_HANDLE
+int read_cgroup_id(struct cgroup *cgrp);
+#else
+int read_cgroup_id(struct cgroup *cgrp)
+{
+ return -1;
+}
+#endif /* HAVE_FILE_HANDLE */
+
#endif /* __CGROUP_H__ */
--
2.32.0.272.g935e593368-goog
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH 2/2] perf stat: Enable BPF counter with --for-each-cgroup
2021-06-13 20:19 [PATCH 1/2] perf tools: Add read_cgroup_id() function Namhyung Kim
@ 2021-06-13 20:20 ` Namhyung Kim
0 siblings, 0 replies; 2+ messages in thread
From: Namhyung Kim @ 2021-06-13 20:20 UTC (permalink / raw
To: Arnaldo Carvalho de Melo, Jiri Olsa
Cc: Ingo Molnar, Peter Zijlstra, Mark Rutland, Alexander Shishkin,
LKML, Andi Kleen, Ian Rogers, Song Liu
Recently bperf was added to use BPF to count perf events for various
purposes. This is an extension for the approach and targetting to
cgroup usages.
When --for-each-cgroup is used with --bpf-counters, it will open
cgroup-switches event per cpu internally and attach the new BPF
program to read given perf_events for cgroups.
Unlike the other bperf, it doesn't share the events with other
processes but it'd reduce unnecessary events (and the overhead of
multiplexing) for each monitored cgroup within the perf session.
Current limitations are:
* bpf_get_cgroup_current_id() works for cgroup v2 only
* it doesn't support cgroup hierarchy
Cc: Song Liu <songliubraving@fb.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/Makefile.perf | 1 +
tools/perf/util/Build | 1 +
tools/perf/util/bpf_counter.c | 5 +
tools/perf/util/bpf_counter_cgroup.c | 316 ++++++++++++++++++++
tools/perf/util/bpf_skel/bperf_cgroup.bpf.c | 118 ++++++++
tools/perf/util/cgroup.c | 2 +
tools/perf/util/cgroup.h | 1 +
7 files changed, 444 insertions(+)
create mode 100644 tools/perf/util/bpf_counter_cgroup.c
create mode 100644 tools/perf/util/bpf_skel/bperf_cgroup.bpf.c
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index e47f04e5b51e..b67099dd2456 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -1015,6 +1015,7 @@ SKEL_OUT := $(abspath $(OUTPUT)util/bpf_skel)
SKEL_TMP_OUT := $(abspath $(SKEL_OUT)/.tmp)
SKELETONS := $(SKEL_OUT)/bpf_prog_profiler.skel.h
SKELETONS += $(SKEL_OUT)/bperf_leader.skel.h $(SKEL_OUT)/bperf_follower.skel.h
+SKELETONS += $(SKEL_OUT)/bperf_cgroup.skel.h
ifdef BUILD_BPF_SKEL
BPFTOOL := $(SKEL_TMP_OUT)/bootstrap/bpftool
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 95e15d1035ab..700d635448ff 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -140,6 +140,7 @@ perf-y += clockid.o
perf-$(CONFIG_LIBBPF) += bpf-loader.o
perf-$(CONFIG_LIBBPF) += bpf_map.o
perf-$(CONFIG_PERF_BPF_SKEL) += bpf_counter.o
+perf-$(CONFIG_PERF_BPF_SKEL) += bpf_counter_cgroup.o
perf-$(CONFIG_BPF_PROLOGUE) += bpf-prologue.o
perf-$(CONFIG_LIBELF) += symbol-elf.o
perf-$(CONFIG_LIBELF) += probe-file.o
diff --git a/tools/perf/util/bpf_counter.c b/tools/perf/util/bpf_counter.c
index 974f10e356f0..7812c5d9b826 100644
--- a/tools/perf/util/bpf_counter.c
+++ b/tools/perf/util/bpf_counter.c
@@ -22,6 +22,7 @@
#include "evsel.h"
#include "evlist.h"
#include "target.h"
+#include "cgroup.h"
#include "cpumap.h"
#include "thread_map.h"
@@ -792,6 +793,8 @@ struct bpf_counter_ops bperf_ops = {
.destroy = bperf__destroy,
};
+extern struct bpf_counter_ops bperf_cgrp_ops;
+
static inline bool bpf_counter_skip(struct evsel *evsel)
{
return list_empty(&evsel->bpf_counter_list) &&
@@ -809,6 +812,8 @@ int bpf_counter__load(struct evsel *evsel, struct target *target)
{
if (target->bpf_str)
evsel->bpf_counter_ops = &bpf_program_profiler_ops;
+ else if (cgrp_event_expanded && target->use_bpf)
+ evsel->bpf_counter_ops = &bperf_cgrp_ops;
else if (target->use_bpf || evsel->bpf_counter ||
evsel__match_bpf_counter_events(evsel->name))
evsel->bpf_counter_ops = &bperf_ops;
diff --git a/tools/perf/util/bpf_counter_cgroup.c b/tools/perf/util/bpf_counter_cgroup.c
new file mode 100644
index 000000000000..707f65893704
--- /dev/null
+++ b/tools/perf/util/bpf_counter_cgroup.c
@@ -0,0 +1,316 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/* Copyright (c) 2019 Facebook */
+/* Copyright (c) 2021 Google */
+
+#include <assert.h>
+#include <limits.h>
+#include <unistd.h>
+#include <sys/file.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <linux/err.h>
+#include <linux/zalloc.h>
+#include <linux/perf_event.h>
+#include <bpf/bpf.h>
+#include <bpf/btf.h>
+#include <bpf/libbpf.h>
+#include <api/fs/fs.h>
+#include <perf/bpf_perf.h>
+
+#include "affinity.h"
+#include "bpf_counter.h"
+#include "cgroup.h"
+#include "counts.h"
+#include "debug.h"
+#include "evsel.h"
+#include "evlist.h"
+#include "target.h"
+#include "cpumap.h"
+#include "thread_map.h"
+
+#include "bpf_skel/bperf_cgroup.skel.h"
+
+static struct perf_event_attr cgrp_switch_attr = {
+ .type = PERF_TYPE_SOFTWARE,
+ .config = PERF_COUNT_SW_CGROUP_SWITCHES,
+ .size = sizeof(cgrp_switch_attr),
+ .sample_period = 1,
+ .disabled = 1,
+};
+
+static struct evsel *cgrp_switch;
+static struct xyarray *cgrp_prog_fds;
+static struct bperf_cgroup_bpf *skel;
+
+#define FD(evt, cpu) (*(int *)xyarray__entry(evt->core.fd, cpu, 0))
+#define PROG(cpu) (*(int *)xyarray__entry(cgrp_prog_fds, cpu, 0))
+
+static void set_max_rlimit(void)
+{
+ struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
+
+ setrlimit(RLIMIT_MEMLOCK, &rinf);
+}
+
+static __u32 bpf_link_get_prog_id(int fd)
+{
+ struct bpf_link_info link_info = {0};
+ __u32 link_info_len = sizeof(link_info);
+
+ bpf_obj_get_info_by_fd(fd, &link_info, &link_info_len);
+ return link_info.prog_id;
+}
+
+static int bperf_load_program(struct evlist *evlist)
+{
+ struct bpf_link *link;
+ struct evsel *evsel;
+ struct cgroup *cgrp, *leader_cgrp;
+ __u32 i, cpu, prog_id;
+ int nr_cpus = evlist->core.all_cpus->nr;
+ int map_size, map_fd, err;
+
+ skel = bperf_cgroup_bpf__open();
+ if (!skel) {
+ pr_err("Failed to open cgroup skeleton\n");
+ return -1;
+ }
+
+ skel->rodata->num_cpus = nr_cpus;
+ skel->rodata->num_events = evlist->core.nr_entries / nr_cgroups;
+
+ BUG_ON(evlist->core.nr_entries % nr_cgroups != 0);
+
+ /* we need one copy of events per cpu for reading */
+ map_size = nr_cpus * evlist->core.nr_entries / nr_cgroups;
+ bpf_map__resize(skel->maps.events, map_size);
+ bpf_map__resize(skel->maps.cpu_idx, nr_cpus);
+ bpf_map__resize(skel->maps.cgrp_idx, nr_cgroups);
+ /* previous result is saved in a per-cpu array */
+ map_size = evlist->core.nr_entries / nr_cgroups;
+ bpf_map__resize(skel->maps.prev_readings, map_size);
+ /* cgroup result needs all events */
+ map_size = nr_cpus * evlist->core.nr_entries;
+ bpf_map__resize(skel->maps.cgrp_readings, map_size);
+
+ set_max_rlimit();
+
+ err = bperf_cgroup_bpf__load(skel);
+ if (err) {
+ pr_err("Failed to load cgroup skeleton\n");
+ goto out;
+ }
+
+ err = -1;
+
+ cgrp_switch = evsel__new(&cgrp_switch_attr);
+ if (evsel__open_per_cpu(cgrp_switch, evlist->core.all_cpus, -1) < 0) {
+ pr_err("Failed to open cgroup switches event\n");
+ goto out;
+ }
+
+ map_fd = bpf_map__fd(skel->maps.cpu_idx);
+ if (map_fd < 0) {
+ pr_err("cannot get cpu idx map\n");
+ goto out;
+ }
+
+ cgrp_prog_fds = xyarray__new(nr_cpus, 1, sizeof(int));
+ if (!cgrp_prog_fds) {
+ pr_err("Failed to allocate cgroup switch prog fd\n");
+ goto out;
+ }
+
+ for (i = 0; i < nr_cpus; i++) {
+ link = bpf_program__attach_perf_event(skel->progs.on_switch,
+ FD(cgrp_switch, i));
+ if (IS_ERR(link)) {
+ pr_err("Failed to attach cgroup program\n");
+ err = PTR_ERR(link);
+ goto out;
+ }
+
+ /* update cpu index in case there are missing cpus */
+ cpu = evlist->core.all_cpus->map[i];
+ bpf_map_update_elem(map_fd, &cpu, &i, BPF_ANY);
+
+ prog_id = bpf_link_get_prog_id(bpf_link__fd(link));
+ PROG(i) = bpf_prog_get_fd_by_id(prog_id);
+ }
+
+ /*
+ * Update cgrp_idx map from cgroup-id to event index.
+ */
+ cgrp = NULL;
+ i = 0;
+
+ evlist__for_each_entry(evlist, evsel) {
+ if (cgrp == NULL || evsel->cgrp == leader_cgrp) {
+ leader_cgrp = evsel->cgrp;
+ evsel->cgrp = NULL;
+
+ /* open single copy of the events w/o cgroup */
+ err = evsel__open_per_cpu(evsel, evlist->core.all_cpus, -1);
+ if (err) {
+ pr_err("Failed to open first cgroup events\n");
+ goto out;
+ }
+
+ map_fd = bpf_map__fd(skel->maps.events);
+ for (cpu = 0; cpu < nr_cpus; cpu++) {
+ __u32 idx = evsel->idx * nr_cpus + cpu;
+ int fd = FD(evsel, cpu);
+
+ bpf_map_update_elem(map_fd, &idx, &fd, BPF_ANY);
+ }
+
+ evsel->cgrp = leader_cgrp;
+ }
+ evsel->supported = true;
+
+ if (evsel->cgrp == cgrp)
+ continue;
+
+ cgrp = evsel->cgrp;
+
+ if (read_cgroup_id(cgrp) < 0) {
+ pr_debug("Failed to get cgroup id\n");
+ err = -1;
+ goto out;
+ }
+
+ map_fd = bpf_map__fd(skel->maps.cgrp_idx);
+ bpf_map_update_elem(map_fd, &cgrp->id, &i, BPF_ANY);
+
+ i++;
+ }
+
+ pr_debug("The kernel does not support test_run for perf_event BPF programs.\n"
+ "Therefore, --for-each-cgroup might show inaccurate readings\n");
+ err = 0;
+
+out:
+ return err;
+}
+
+static int bperf_cgrp__load(struct evsel *evsel, struct target *target)
+{
+ static bool bperf_loaded = false;
+
+ evsel->bperf_leader_prog_fd = -1;
+ evsel->bperf_leader_link_fd = -1;
+
+ if (!bperf_loaded && bperf_load_program(evsel->evlist))
+ return -1;
+
+ bperf_loaded = true;
+ /* just to bypass bpf_counter_skip() */
+ evsel->follower_skel = (struct bperf_follower_bpf *)skel;
+
+ return 0;
+}
+
+static int bperf_cgrp__install_pe(struct evsel *evsel, int cpu, int fd)
+{
+ /* nothing to do */
+ return 0;
+}
+
+/*
+ * trigger the leader prog on each cpu, so the cgrp_reading map could get
+ * the latest results.
+ */
+static int bperf_sync_counters(struct evlist *evlist)
+{
+ struct affinity affinity;
+ int i, cpu;
+
+ /* change affinity to rotate all cpus to trigger cgroup-switches (hopefully) */
+ if (affinity__setup(&affinity) < 0)
+ return -1;
+
+ evlist__for_each_cpu(evlist, i, cpu)
+ affinity__set(&affinity, cpu);
+
+ affinity__cleanup(&affinity);
+
+ return 0;
+}
+
+static int bperf_cgrp__enable(struct evsel *evsel)
+{
+ skel->bss->enabled = 1;
+ return 0;
+}
+
+static int bperf_cgrp__disable(struct evsel *evsel)
+{
+ if (evsel->idx)
+ return 0;
+
+ bperf_sync_counters(evsel->evlist);
+
+ skel->bss->enabled = 0;
+ return 0;
+}
+
+static int bperf_cgrp__read(struct evsel *evsel)
+{
+ struct evlist *evlist = evsel->evlist;
+ int i, nr_cpus = evlist->core.all_cpus->nr;
+ struct perf_counts_values *counts;
+ struct bpf_perf_event_value values;
+ struct cgroup *cgrp = NULL;
+ int cgrp_idx = -1;
+ int reading_map_fd, err = 0;
+ __u32 idx;
+
+ if (evsel->idx)
+ return 0;
+
+ reading_map_fd = bpf_map__fd(skel->maps.cgrp_readings);
+
+ evlist__for_each_entry(evlist, evsel) {
+ if (cgrp != evsel->cgrp) {
+ cgrp = evsel->cgrp;
+ cgrp_idx++;
+ }
+
+ for (i = 0; i < nr_cpus; i++) {
+ idx = evsel->idx * nr_cpus + i;
+ err = bpf_map_lookup_elem(reading_map_fd, &idx, &values);
+ if (err)
+ goto out;
+
+ counts = perf_counts(evsel->counts, i, 0);
+ counts->val = values.counter;
+ counts->ena = values.enabled;
+ counts->run = values.running;
+ }
+ }
+
+out:
+ return err;
+}
+
+static int bperf_cgrp__destroy(struct evsel *evsel)
+{
+ if (evsel->idx)
+ return 0;
+
+ bperf_cgroup_bpf__destroy(skel);
+ evsel__delete(cgrp_switch); // it'll destroy on_switch progs too
+ free(cgrp_prog_fds);
+
+ return 0;
+}
+
+struct bpf_counter_ops bperf_cgrp_ops = {
+ .load = bperf_cgrp__load,
+ .enable = bperf_cgrp__enable,
+ .disable = bperf_cgrp__disable,
+ .read = bperf_cgrp__read,
+ .install_pe = bperf_cgrp__install_pe,
+ .destroy = bperf_cgrp__destroy,
+};
diff --git a/tools/perf/util/bpf_skel/bperf_cgroup.bpf.c b/tools/perf/util/bpf_skel/bperf_cgroup.bpf.c
new file mode 100644
index 000000000000..8d07f83cdde4
--- /dev/null
+++ b/tools/perf/util/bpf_skel/bperf_cgroup.bpf.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+// Copyright (c) 2021 Facebook
+// Copyright (c) 2021 Google
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+#define MAX_EVENTS 32 // max events per cgroup: arbitrary
+
+// NOTE: many of map and global data will be modified before loading
+// from the userspace (perf tool) using the skeleton helpers.
+
+// single set of global perf events to measure
+struct {
+ __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
+ __uint(key_size, sizeof(__u32));
+ __uint(value_size, sizeof(int));
+ __uint(max_entries, 1);
+} events SEC(".maps");
+
+// from logical cpu number to event index
+// useful when user wants to count subset of cpus
+struct {
+ __uint(type, BPF_MAP_TYPE_HASH);
+ __uint(key_size, sizeof(__u32));
+ __uint(value_size, sizeof(__u32));
+ __uint(max_entries, 1);
+} cpu_idx SEC(".maps");
+
+// from cgroup id to event index
+struct {
+ __uint(type, BPF_MAP_TYPE_HASH);
+ __uint(key_size, sizeof(__u64));
+ __uint(value_size, sizeof(__u32));
+ __uint(max_entries, 1);
+} cgrp_idx SEC(".maps");
+
+// per-cpu event snapshots to calculate delta
+struct {
+ __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
+ __uint(key_size, sizeof(__u32));
+ __uint(value_size, sizeof(struct bpf_perf_event_value));
+ __uint(map_flags, BPF_F_PRESERVE_ELEMS);
+} prev_readings SEC(".maps");
+
+// aggregated event values for each cgroup
+// will be read from the user-space
+struct {
+ __uint(type, BPF_MAP_TYPE_ARRAY);
+ __uint(key_size, sizeof(__u32));
+ __uint(value_size, sizeof(struct bpf_perf_event_value));
+ __uint(map_flags, BPF_F_PRESERVE_ELEMS);
+} cgrp_readings SEC(".maps");
+
+const volatile __u32 num_events = 1;
+const volatile __u32 num_cpus = 1;
+
+int enabled = 0;
+
+// This will be attached to cgroup-switches event for each cpu
+SEC("perf_events")
+int BPF_PROG(on_switch)
+{
+ register __u32 idx = 0; // to have it in a register to pass BPF verifier
+ struct bpf_perf_event_value val, *prev_val, *cgrp_val;
+ __u32 cpu = bpf_get_smp_processor_id();
+ __u64 cgrp = bpf_get_current_cgroup_id();
+ __u32 evt_idx, key;
+ __u32 *elem;
+ long err;
+
+ // map the current CPU to a CPU index, particularly necessary if there
+ // are fewer CPUs profiled on than all CPUs.
+ elem = bpf_map_lookup_elem(&cpu_idx, &cpu);
+ if (!elem)
+ return 0;
+ cpu = *elem;
+
+ elem = bpf_map_lookup_elem(&cgrp_idx, &cgrp);
+ if (elem)
+ cgrp = *elem;
+ else
+ cgrp = ~0ULL;
+
+ for ( ; idx < MAX_EVENTS; idx++) {
+ if (idx == num_events)
+ break;
+
+ // XXX: do not pass idx directly (for verifier)
+ key = idx;
+ // this is per-cpu array for diff
+ prev_val = bpf_map_lookup_elem(&prev_readings, &key);
+ if (!prev_val)
+ continue;
+
+ // read from global event array
+ evt_idx = idx * num_cpus + cpu;
+ err = bpf_perf_event_read_value(&events, evt_idx, &val, sizeof(val));
+ if (err)
+ continue;
+
+ if (enabled && cgrp != ~0ULL) {
+ // aggregate the result by cgroup
+ evt_idx += cgrp * num_cpus * num_events;
+ cgrp_val = bpf_map_lookup_elem(&cgrp_readings, &evt_idx);
+ if (cgrp_val) {
+ cgrp_val->counter += val.counter - prev_val->counter;
+ cgrp_val->enabled += val.enabled - prev_val->enabled;
+ cgrp_val->running += val.running - prev_val->running;
+ }
+ }
+
+ *prev_val = val;
+ }
+ return 0;
+}
+
+char LICENSE[] SEC("license") = "Dual BSD/GPL";
diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
index ef18c988c681..c825127edc04 100644
--- a/tools/perf/util/cgroup.c
+++ b/tools/perf/util/cgroup.c
@@ -17,6 +17,7 @@
#include <regex.h>
int nr_cgroups;
+bool cgrp_event_expanded;
/* used to match cgroup name with patterns */
struct cgroup_name {
@@ -465,6 +466,7 @@ int evlist__expand_cgroup(struct evlist *evlist, const char *str,
}
ret = 0;
+ cgrp_event_expanded = true;
out_err:
evlist__delete(orig_list);
diff --git a/tools/perf/util/cgroup.h b/tools/perf/util/cgroup.h
index 707adbe25123..f8916a8c754a 100644
--- a/tools/perf/util/cgroup.h
+++ b/tools/perf/util/cgroup.h
@@ -17,6 +17,7 @@ struct cgroup {
};
extern int nr_cgroups; /* number of explicit cgroups defined */
+extern bool cgrp_event_expanded;
struct cgroup *cgroup__get(struct cgroup *cgroup);
void cgroup__put(struct cgroup *cgroup);
--
2.32.0.272.g935e593368-goog
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2021-06-13 20:19 [PATCH 1/2] perf tools: Add read_cgroup_id() function Namhyung Kim
2021-06-13 20:20 ` [PATCH 2/2] perf stat: Enable BPF counter with --for-each-cgroup Namhyung Kim
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