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Subject[PATCH 7/9] perf record: Add --all-cgroups option
Date
The --all-cgroups option is to enable cgroup profiling support.  It
tells kernel to record CGROUP events in the ring buffer so that perf
report can identify task/cgroup association later.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/Documentation/perf-record.txt | 5 ++++-
tools/perf/builtin-record.c | 5 +++++
tools/perf/util/evsel.c | 13 ++++++++++++-
tools/perf/util/evsel.h | 1 +
tools/perf/util/record.h | 1 +
5 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index b23a4012a606..6dd9d69d7dee 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -385,7 +385,10 @@ displayed with the weight and local_weight sort keys. This currently works for
abort events and some memory events in precise mode on modern Intel CPUs.

--namespaces::
-Record events of type PERF_RECORD_NAMESPACES.
+Record events of type PERF_RECORD_NAMESPACES. This enables 'cgroup_id' sort key.
+
+--all-cgroups::
+Record events of type PERF_RECORD_CGROUP. This enables 'cgroup' sort key.

--transaction::
Record transaction flags for transaction related events.
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 2802de9538ff..7d7912e121d6 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1433,6 +1433,9 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
if (rec->opts.record_namespaces)
tool->namespace_events = true;

+ if (rec->opts.record_cgroup)
+ tool->cgroup_events = true;
+
if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) {
signal(SIGUSR2, snapshot_sig_handler);
if (rec->opts.auxtrace_snapshot_mode)
@@ -2363,6 +2366,8 @@ static struct option __record_options[] = {
"per thread proc mmap processing timeout in ms"),
OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
"Record namespaces events"),
+ OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup,
+ "Record cgroup events"),
OPT_BOOLEAN(0, "switch-events", &record.opts.record_switch_events,
"Record context switch events"),
OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 0f5a67603139..d649b5606178 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1102,6 +1102,11 @@ void perf_evsel__config(struct evsel *evsel, struct record_opts *opts,
if (opts->record_namespaces)
attr->namespaces = track;

+ if (opts->record_cgroup) {
+ attr->cgroup = track && !perf_missing_features.cgroup;
+ perf_evsel__set_sample_bit(evsel, CGROUP);
+ }
+
if (opts->record_switch_events)
attr->context_switch = track;

@@ -1671,6 +1676,8 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
evsel->core.attr.ksymbol = 0;
if (perf_missing_features.bpf)
evsel->core.attr.bpf_event = 0;
+ if (perf_missing_features.cgroup)
+ evsel->core.attr.cgroup = 0;
retry_sample_id:
if (perf_missing_features.sample_id_all)
evsel->core.attr.sample_id_all = 0;
@@ -1782,7 +1789,11 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
* Must probe features in the order they were added to the
* perf_event_attr interface.
*/
- if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
+ if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) {
+ perf_missing_features.cgroup = true;
+ pr_debug2_peo("switching off cgroup\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
perf_missing_features.aux_output = true;
pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n");
goto out_close;
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index dc14f4a823cd..df71b530740b 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -119,6 +119,7 @@ struct perf_missing_features {
bool ksymbol;
bool bpf;
bool aux_output;
+ bool cgroup;
};

extern struct perf_missing_features perf_missing_features;
diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h
index 5421fd2ad383..24316458be20 100644
--- a/tools/perf/util/record.h
+++ b/tools/perf/util/record.h
@@ -34,6 +34,7 @@ struct record_opts {
bool auxtrace_snapshot_on_exit;
bool auxtrace_sample_mode;
bool record_namespaces;
+ bool record_cgroup;
bool record_switch_events;
bool all_kernel;
bool all_user;
--
2.24.1.735.g03f4e72817-goog
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