perf script: Add --show-cgroup-events option

The --show-cgroup-events option is to print CGROUP events in the
output like others.

Committer testing:

  [root@seventh ~]# perf record --all-cgroups --namespaces /wb/cgtest
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.039 MB perf.data (487 samples) ]
  [root@seventh ~]# perf script --show-cgroup-events | grep PERF_RECORD_CGROUP -B2 -A2
           swapper     0     0.000000: PERF_RECORD_CGROUP cgroup: 1 /
              perf 12145 11200.440730:          1 cycles:  ffffffffb900d58b __intel_pmu_enable_all.constprop.0+0x3b (/lib/modules/5.6.0-rc6-00008-gfe2413eefd7f/build/vmlinux)
              perf 12145 11200.440733:          1 cycles:  ffffffffb900d58b __intel_pmu_enable_all.constprop.0+0x3b (/lib/modules/5.6.0-rc6-00008-gfe2413eefd7f/build/vmlinux)
  --
            cgtest 12145 11200.440739:     193472 cycles:  ffffffffb90f6fbc commit_creds+0x1fc (/lib/modules/5.6.0-rc6-00008-gfe2413eefd7f/build/vmlinux)
            cgtest 12145 11200.440790:    2691608 cycles:      7fa2cb43019b _dl_sysdep_start+0x7cb (/usr/lib64/ld-2.29.so)
            cgtest 12145 11200.440962: PERF_RECORD_CGROUP cgroup: 83 /sub
            cgtest 12147 11200.441054:          1 cycles:  ffffffffb900d58b __intel_pmu_enable_all.constprop.0+0x3b (/lib/modules/5.6.0-rc6-00008-gfe2413eefd7f/build/vmlinux)
            cgtest 12147 11200.441057:          1 cycles:  ffffffffb900d58b __intel_pmu_enable_all.constprop.0+0x3b (/lib/modules/5.6.0-rc6-00008-gfe2413eefd7f/build/vmlinux)
  --
            cgtest 12148 11200.441103:      10227 cycles:  ffffffffb9a0153d end_repeat_nmi+0x48 (/lib/modules/5.6.0-rc6-00008-gfe2413eefd7f/build/vmlinux)
            cgtest 12148 11200.441106:     273295 cycles:  ffffffffb99ecbc7 copy_page+0x7 (/lib/modules/5.6.0-rc6-00008-gfe2413eefd7f/build/vmlinux)
            cgtest 12147 11200.441133: PERF_RECORD_CGROUP cgroup: 88 /sub/cgrp1
            cgtest 12147 11200.441143:    2788845 cycles:  ffffffffb94676c2 security_genfs_sid+0x102 (/lib/modules/5.6.0-rc6-00008-gfe2413eefd7f/build/vmlinux)
            cgtest 12148 11200.441162: PERF_RECORD_CGROUP cgroup: 93 /sub/cgrp2
            cgtest 12148 11200.441182:    2669546 cycles:            401020 _init+0x20 (/wb/cgtest)
            cgtest 12149 11200.441247:          1 cycles:  ffffffffb900d58b __intel_pmu_enable_all.constprop.0+0x3b (/lib/modules/5.6.0-rc6-00008-gfe2413eefd7f/build/vmlinux)
  [root@seventh ~]#

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/20200325124536.2800725-10-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index 4af255b..99a9853 100644 (file)
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -319,6 +319,9 @@ OPTIONS
 --show-bpf-events
        Display bpf events i.e. events of type PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT.
 
+--show-cgroup-events
+       Display cgroup events i.e. events of type PERF_RECORD_CGROUP.
+
 --demangle::
        Demangle symbol names to human readable form. It's enabled by default,
        disable with --no-demangle.

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index f63869a..186ebf8 100644 (file)
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1694,6 +1694,7 @@ struct perf_script {
        bool                    show_lost_events;
        bool                    show_round_events;
        bool                    show_bpf_events;
+       bool                    show_cgroup_events;
        bool                    allocated;
        bool                    per_event_dump;
        struct evswitch         evswitch;
@@ -2212,6 +2213,41 @@ out:
        return ret;
 }
 
+static int process_cgroup_event(struct perf_tool *tool,
+                               union perf_event *event,
+                               struct perf_sample *sample,
+                               struct machine *machine)
+{
+       struct thread *thread;
+       struct perf_script *script = container_of(tool, struct perf_script, tool);
+       struct perf_session *session = script->session;
+       struct evsel *evsel = perf_evlist__id2evsel(session->evlist, sample->id);
+       int ret = -1;
+
+       thread = machine__findnew_thread(machine, sample->pid, sample->tid);
+       if (thread == NULL) {
+               pr_debug("problem processing CGROUP event, skipping it.\n");
+               return -1;
+       }
+
+       if (perf_event__process_cgroup(tool, event, sample, machine) < 0)
+               goto out;
+
+       if (!evsel->core.attr.sample_id_all) {
+               sample->cpu = 0;
+               sample->time = 0;
+       }
+       if (!filter_cpu(sample)) {
+               perf_sample__fprintf_start(sample, thread, evsel,
+                                          PERF_RECORD_CGROUP, stdout);
+               perf_event__fprintf(event, stdout);
+       }
+       ret = 0;
+out:
+       thread__put(thread);
+       return ret;
+}
+
 static int process_fork_event(struct perf_tool *tool,
                              union perf_event *event,
                              struct perf_sample *sample,
@@ -2551,6 +2587,8 @@ static int __cmd_script(struct perf_script *script)
                script->tool.context_switch = process_switch_event;
        if (script->show_namespace_events)
                script->tool.namespaces = process_namespaces_event;
+       if (script->show_cgroup_events)
+               script->tool.cgroup = process_cgroup_event;
        if (script->show_lost_events)
                script->tool.lost = process_lost_event;
        if (script->show_round_events) {
@@ -3476,6 +3514,7 @@ int cmd_script(int argc, const char **argv)
                        .mmap2           = perf_event__process_mmap2,
                        .comm            = perf_event__process_comm,
                        .namespaces      = perf_event__process_namespaces,
+                       .cgroup          = perf_event__process_cgroup,
                        .exit            = perf_event__process_exit,
                        .fork            = perf_event__process_fork,
                        .attr            = process_attr,
@@ -3577,6 +3616,8 @@ int cmd_script(int argc, const char **argv)
                    "Show context switch events (if recorded)"),
        OPT_BOOLEAN('\0', "show-namespace-events", &script.show_namespace_events,
                    "Show namespace events (if recorded)"),
+       OPT_BOOLEAN('\0', "show-cgroup-events", &script.show_cgroup_events,
+                   "Show cgroup events (if recorded)"),
        OPT_BOOLEAN('\0', "show-lost-events", &script.show_lost_events,
                    "Show lost events (if recorded)"),
        OPT_BOOLEAN('\0', "show-round-events", &script.show_round_events,