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Subject[tip: perf/urgent] perf top: Add --all-cgroups option
The following commit has been merged into the perf/urgent branch of tip:

Commit-ID: f382842fa0244ae1e2c28c8377732c85ec1fe7a9
Gitweb: https://git.kernel.org/tip/f382842fa0244ae1e2c28c8377732c85ec1fe7a9
Author: Namhyung Kim <namhyung@kernel.org>
AuthorDate: Wed, 25 Mar 2020 21:45:35 +09:00
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitterDate: Fri, 03 Apr 2020 09:37:55 -03:00

perf top: Add --all-cgroups option

The --all-cgroups option is to enable cgroup profiling support. It
tells kernel to record CGROUP events in the ring buffer so that 'perf
top' can identify task/cgroup association later.

Committer testing:

Use:

# perf top --all-cgroups -s cgroup_id,cgroup,pid

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20200325124536.2800725-9-namhyung@kernel.org
Link: http://lore.kernel.org/lkml/20200402015249.3800462-1-namhyung@kernel.org
[ Extracted the HAVE_FILE_HANDLE from the followup patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/Documentation/perf-top.txt | 4 ++++
tools/perf/builtin-top.c | 15 +++++++++++++++
2 files changed, 19 insertions(+)

diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
index 324b6b5..ddab103 100644
--- a/tools/perf/Documentation/perf-top.txt
+++ b/tools/perf/Documentation/perf-top.txt
@@ -272,6 +272,10 @@ Default is to monitor all CPUS.
Record events of type PERF_RECORD_NAMESPACES and display it with the
'cgroup_id' sort key.

+--all-cgroups::
+ Record events of type PERF_RECORD_CGROUP and display it with the
+ 'cgroup' sort key.
+
--switch-on EVENT_NAME::
Only consider events after this event is found.

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index d2539b7..02ea2cf 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1246,6 +1246,14 @@ static int __cmd_top(struct perf_top *top)

if (opts->record_namespaces)
top->tool.namespace_events = true;
+ if (opts->record_cgroup) {
+#ifdef HAVE_FILE_HANDLE
+ top->tool.cgroup_events = true;
+#else
+ pr_err("cgroup tracking is not supported.\n");
+ return -1;
+#endif
+ }

ret = perf_event__synthesize_bpf_events(top->session, perf_event__process,
&top->session->machines.host,
@@ -1253,6 +1261,11 @@ static int __cmd_top(struct perf_top *top)
if (ret < 0)
pr_debug("Couldn't synthesize BPF events: Pre-existing BPF programs won't have symbols resolved.\n");

+ ret = perf_event__synthesize_cgroups(&top->tool, perf_event__process,
+ &top->session->machines.host);
+ if (ret < 0)
+ pr_debug("Couldn't synthesize cgroup events.\n");
+
machine__synthesize_threads(&top->session->machines.host, &opts->target,
top->evlist->core.threads, false,
top->nr_threads_synthesize);
@@ -1545,6 +1558,8 @@ int cmd_top(int argc, const char **argv)
"number of thread to run event synthesize"),
OPT_BOOLEAN(0, "namespaces", &opts->record_namespaces,
"Record namespaces events"),
+ OPT_BOOLEAN(0, "all-cgroups", &opts->record_cgroup,
+ "Record cgroup events"),
OPTS_EVSWITCH(&top.evswitch),
OPT_END()
};
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