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perf intel-pt: Time filter logged perf events 

Change the debug logging (when used with the --time option) to time
filter logged perf events, but allow that to be overridden by using
"d+a" instead of plain "d".

That can reduce the size of the log file.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20200710151104.15137-10-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2020-07-10 18:11:01 +03:00 committed by Arnaldo Carvalho de Melo
parent 8b83fccdd2
commit d4575f5fce
2 changed files with 19 additions and 3 deletions
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3
tools/perf/Documentation/perf-intel-pt.txt
View File

@ -886,6 +886,9 @@ and that the resulting file may be very large. The "d" option may be followed
by flags which affect what debug messages will or will not be logged. Each flag
must be preceded by either '+' or '-'. The flags support by Intel PT are:
-a Suppress logging of perf events
+a Log all perf events
By default, logged perf events are filtered by any specified time ranges, but
flag +a overrides that.
In addition, the period of the "instructions" event can be specified. e.g.

19
tools/perf/util/intel-pt.c
View File

@ -249,9 +249,22 @@ static void intel_pt_dump_sample(struct perf_session *session,
intel_pt_dump(pt, sample->aux_sample.data, sample->aux_sample.size);
}
static bool intel_pt_log_events(struct intel_pt *pt)
static bool intel_pt_log_events(struct intel_pt *pt, u64 tm)
{
return !(pt->synth_opts.log_minus_flags & AUXTRACE_LOG_FLG_ALL_PERF_EVTS);
struct perf_time_interval *range = pt->synth_opts.ptime_range;
int n = pt->synth_opts.range_num;
if (pt->synth_opts.log_plus_flags & AUXTRACE_LOG_FLG_ALL_PERF_EVTS)
return true;
if (pt->synth_opts.log_minus_flags & AUXTRACE_LOG_FLG_ALL_PERF_EVTS)
return false;
/* perf_time__ranges_skip_sample does not work if time is zero */
if (!tm)
tm = 1;
return !n || !perf_time__ranges_skip_sample(range, n, tm);
}
static int intel_pt_do_fix_overlap(struct intel_pt *pt, struct auxtrace_buffer *a,
@ -2747,7 +2760,7 @@ static int intel_pt_process_event(struct perf_session *session,
if (!err && event->header.type == PERF_RECORD_TEXT_POKE)
err = intel_pt_text_poke(pt, event);
if (intel_pt_enable_logging && intel_pt_log_events(pt)) {
if (intel_pt_enable_logging && intel_pt_log_events(pt, sample->time)) {
intel_pt_log("event %u: cpu %d time %"PRIu64" tsc %#"PRIx64" ",
event->header.type, sample->cpu, sample->time, timestamp);
intel_pt_log_event(event);