linux-kernel - [PATCH V2 1/2] perf tools: set no_aux_samples for the tracking event in PT

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Date:   Fri, 30 Jun 2017 10:16:55 -0400
From:   kan.liang@...el.com
To:     acme@...nel.org, jolsa@...hat.com, linux-kernel@...r.kernel.org
Cc:     mingo@...hat.com, peterz@...radead.org, adrian.hunter@...el.com,
        alexander.shishkin@...ux.intel.com, ak@...ux.intel.com,
        Kan Liang <kan.liang@...el.com>
Subject: [PATCH V2 1/2] perf tools: set no_aux_samples for the tracking event in PT

From: Kan Liang <kan.liang@...el.com>

The reason of introducing the tracking event (a dummy software event) is
to collect side-band information. Additional sampling is wasteful.
no_aux_samples should be set for tracking event.

Signed-off-by: Kan Liang <kan.liang@...el.com>
---

Changes since V1
- new patch to set no_aux_samples for the tracking event (jirka)

 tools/perf/arch/x86/util/intel-pt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/arch/x86/util/intel-pt.c b/tools/perf/arch/x86/util/intel-pt.c
index f630de0..4fe1aed 100644
--- a/tools/perf/arch/x86/util/intel-pt.c
+++ b/tools/perf/arch/x86/util/intel-pt.c
@@ -751,6 +751,7 @@ static int intel_pt_recording_options(struct auxtrace_record *itr,
 		tracking_evsel->attr.freq = 0;
 		tracking_evsel->attr.sample_period = 1;
 
+		tracking_evsel->no_aux_samples = true;
 		if (need_immediate)
 			tracking_evsel->immediate = true;
 
-- 
2.9.4