diff options
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); |