[PATCH v3 3/3] perf tools: Add 'cgroup-switches' software event

[Namhyung Kim]

It counts how often cgroups are changed actually during the context
switches.

  # perf stat -a -e context-switches,cgroup-switches -a sleep 1

   Performance counter stats for 'system wide':

              11,267      context-switches
              10,950      cgroup-switches

         1.015634369 seconds time elapsed

Signed-off-by: Namhyung Kim <namhy...@kernel.org>
---
 tools/include/uapi/linux/perf_event.h | 1 +
 tools/perf/util/parse-events.c        | 4 ++++
 tools/perf/util/parse-events.l        | 1 +
 3 files changed, 6 insertions(+)

diff --git a/tools/include/uapi/linux/perf_event.h 
b/tools/include/uapi/linux/perf_event.h
index b15e3447cd9f..16b9538ad89b 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -112,6 +112,7 @@ enum perf_sw_ids {
        PERF_COUNT_SW_EMULATION_FAULTS          = 8,
        PERF_COUNT_SW_DUMMY                     = 9,
        PERF_COUNT_SW_BPF_OUTPUT                = 10,
+       PERF_COUNT_SW_CGROUP_SWITCHES           = 11,
 
        PERF_COUNT_SW_MAX,                      /* non-ABI */
 };
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 42c84adeb2fb..09ff678519f3 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -145,6 +145,10 @@ struct event_symbol event_symbols_sw[PERF_COUNT_SW_MAX] = {
                .symbol = "bpf-output",
                .alias  = "",
        },
+       [PERF_COUNT_SW_CGROUP_SWITCHES] = {
+               .symbol = "cgroup-switches",
+               .alias  = "",
+       },
 };
 
 #define __PERF_EVENT_FIELD(config, name) \
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 9db5097317f4..88f203bb6fab 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -347,6 +347,7 @@ emulation-faults                            { return 
sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_EM
 dummy                                          { return sym(yyscanner, 
PERF_TYPE_SOFTWARE, PERF_COUNT_SW_DUMMY); }
 duration_time                                  { return tool(yyscanner, 
PERF_TOOL_DURATION_TIME); }
 bpf-output                                     { return sym(yyscanner, 
PERF_TYPE_SOFTWARE, PERF_COUNT_SW_BPF_OUTPUT); }
+cgroup-switches                                        { return sym(yyscanner, 
PERF_TYPE_SOFTWARE, PERF_COUNT_SW_CGROUP_SWITCHES); }
 
        /*
         * We have to handle the kernel PMU event 
cycles-ct/cycles-t/mem-loads/mem-stores separately.
-- 
2.30.0.478.g8a0d178c01-goog