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perf intel-pt: Use itrace debug log flags to suppress some messages 

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

Suppressing perf events is useful for decreasing the size of the log.

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/20200710151104.15137-9-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2020-07-10 18:11:00 +03:00 committed by Arnaldo Carvalho de Melo
parent 935aac2d2d
commit 8b83fccdd2
2 changed files with 14 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
tools/perf/Documentation/perf-intel-pt.txt
View File

@ -882,7 +882,10 @@ For example, for errors but not overflow or data lost errors:
The "d" option will cause the creation of a file "intel_pt.log" containing all
decoded packets and instructions. Note that this option slows down the decoder
and that the resulting file may be very large.
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
In addition, the period of the "instructions" event can be specified. e.g.

11
tools/perf/util/intel-pt.c
View File

@ -249,6 +249,11 @@ 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)
{
return !(pt->synth_opts.log_minus_flags & AUXTRACE_LOG_FLG_ALL_PERF_EVTS);
}
static int intel_pt_do_fix_overlap(struct intel_pt *pt, struct auxtrace_buffer *a,
struct auxtrace_buffer *b)
{
@ -2586,10 +2591,6 @@ static int intel_pt_context_switch(struct intel_pt *pt, union perf_event *event,
return -EINVAL;
}
intel_pt_log("context_switch: cpu %d pid %d tid %d time %"PRIu64" tsc %#"PRIx64"\n",
cpu, pid, tid, sample->time, perf_time_to_tsc(sample->time,
&pt->tc));
ret = intel_pt_sync_switch(pt, cpu, tid, sample->time);
if (ret <= 0)
return ret;
@ -2746,9 +2747,11 @@ 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)) {
intel_pt_log("event %u: cpu %d time %"PRIu64" tsc %#"PRIx64" ",
event->header.type, sample->cpu, sample->time, timestamp);
intel_pt_log_event(event);
}
return err;
}