linux-kernel - [PATCH 07/11] perf intel-pt: Use itrace debug log flags to suppress some messages

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Message-Id: <20200709173628.5613-8-adrian.hunter@intel.com>
Date:   Thu,  9 Jul 2020 20:36:24 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 07/11] perf intel-pt: Use itrace debug log flags to suppress some messages

The "d" option may be followed by a number which has the following effect:
	1	Suppress logging of perf events

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

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/Documentation/perf-intel-pt.txt |  4 +++-
 tools/perf/util/intel-pt.c                 | 19 ++++++++++++-------
 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/tools/perf/Documentation/perf-intel-pt.txt b/tools/perf/Documentation/perf-intel-pt.txt
index 0fcd8ad897b0..85a2ff804900 100644
--- a/tools/perf/Documentation/perf-intel-pt.txt
+++ b/tools/perf/Documentation/perf-intel-pt.txt
@@ -879,7 +879,9 @@ The values may be combined by bitwise OR'ing them.
 
 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 a number which has the following effect:
+	1	Suppress logging of perf events
 
 In addition, the period of the "instructions" event can be specified. e.g.
 
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index a8e8e8acbcc8..d90375659244 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -49,6 +49,8 @@
 #define INTEL_PT_ERR_SUPPRESS_OVF	1
 #define INTEL_PT_ERR_SUPPRESS_LOST	2
 
+#define INTEL_PT_LOG_SUPPRESS_EV	1
+
 struct range {
 	u64 start;
 	u64 end;
@@ -252,6 +254,11 @@ 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_flags & INTEL_PT_LOG_SUPPRESS_EV);
+}
+
 static int intel_pt_do_fix_overlap(struct intel_pt *pt, struct auxtrace_buffer *a,
 				   struct auxtrace_buffer *b)
 {
@@ -2589,10 +2596,6 @@ 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;
@@ -2749,9 +2752,11 @@ 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);
 
-	intel_pt_log("event %u: cpu %d time %"PRIu64" tsc %#"PRIx64" ",
-		     event->header.type, sample->cpu, sample->time, timestamp);
-	intel_pt_log_event(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;
 }
-- 
2.25.1