perf evsel: Mark a evsel as disabled when asking the kernel do disable it

Because there may be more such events in the ring buffer that should be
discarded when an app decides to stop considering them.

At some point we'll do this with eBPF, this way we stop them at origin,
before they are placed in the ring buffer.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-uzufuxws4hufigx07ue1dpv6@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index be440df..e88e6f9 100644 (file)
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -358,7 +358,7 @@ void perf_evlist__disable(struct perf_evlist *evlist)
        struct perf_evsel *pos;
 
        evlist__for_each_entry(evlist, pos) {
-               if (!perf_evsel__is_group_leader(pos) || !pos->fd)
+               if (pos->disabled || !perf_evsel__is_group_leader(pos) || !pos->fd)
                        continue;
                perf_evsel__disable(pos);
        }

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 7e95ec1..6d18705 100644 (file)
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1207,16 +1207,27 @@ int perf_evsel__append_addr_filter(struct perf_evsel *evsel, const char *filter)
 
 int perf_evsel__enable(struct perf_evsel *evsel)
 {
-       return perf_evsel__run_ioctl(evsel,
-                                    PERF_EVENT_IOC_ENABLE,
-                                    0);
+       int err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, 0);
+
+       if (!err)
+               evsel->disabled = false;
+
+       return err;
 }
 
 int perf_evsel__disable(struct perf_evsel *evsel)
 {
-       return perf_evsel__run_ioctl(evsel,
-                                    PERF_EVENT_IOC_DISABLE,
-                                    0);
+       int err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, 0);
+       /*
+        * We mark it disabled here so that tools that disable a event can
+        * ignore events after they disable it. I.e. the ring buffer may have
+        * already a few more events queued up before the kernel got the stop
+        * request.
+        */
+       if (!err)
+               evsel->disabled = true;
+
+       return err;
 }
 
 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)

diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index ad5d615..4ef50f1 100644 (file)
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -122,6 +122,7 @@ struct perf_evsel {
        bool                    snapshot;
        bool                    supported;
        bool                    needs_swap;
+       bool                    disabled;
        bool                    no_aux_samples;
        bool                    immediate;
        bool                    system_wide;