diff options
| author | Ian Rogers <irogers@google.com> | 2020-04-22 20:36:15 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-05-28 16:03:25 +0300 |
| commit | 0a892c1c947230f9373c9a3c94df1babe989861f (patch) | |
| tree | e93279e7281a54884441e9873edded76a01f05e9 /tools/perf/builtin-record.c | |
| parent | 5885a202d04482427bc4079981680b30e3e5bbab (diff) | |
| download | linux-0a892c1c947230f9373c9a3c94df1babe989861f.tar.xz | |
perf record: Add dummy event during system wide synthesis
During the processing of /proc during event synthesis new processes may
start. Add a dummy event if /proc is to be processed, to capture mmaps
for starting processes. This reuses the existing logic for
initial-delay.
v3 fixes the attr test of test-record-C0
v2 fixes the dummy event configuration and a branch stack issue.
Suggested-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20200422173615.59436-1-irogers@google.com
[ split from a larger patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-record.c')
| -rw-r--r-- | tools/perf/builtin-record.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index e4efdbf1a81e..4d4502b7fea0 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -825,19 +825,28 @@ static int record__open(struct record *rec) int rc = 0; /* - * For initial_delay we need to add a dummy event so that we can track - * PERF_RECORD_MMAP while we wait for the initial delay to enable the - * real events, the ones asked by the user. + * For initial_delay or system wide, we need to add a dummy event so + * that we can track PERF_RECORD_MMAP to cover the delay of waiting or + * event synthesis. */ - if (opts->initial_delay) { + if (opts->initial_delay || target__has_cpu(&opts->target)) { if (perf_evlist__add_dummy(evlist)) return -ENOMEM; + /* Disable tracking of mmaps on lead event. */ pos = evlist__first(evlist); pos->tracking = 0; + /* Set up dummy event. */ pos = evlist__last(evlist); pos->tracking = 1; - pos->core.attr.enable_on_exec = 1; + /* + * Enable the dummy event when the process is forked for + * initial_delay, immediately for system wide. + */ + if (opts->initial_delay) + pos->core.attr.enable_on_exec = 1; + else + pos->immediate = 1; } perf_evlist__config(evlist, opts, &callchain_param); |