linux-kernel - [PATCH 3/4] perf tools: Add 'suppress_aux' attribute bit definition and fallback

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Message-Id: <20171109170548.32133-4-alexander.shishkin@linux.intel.com>
Date:   Thu,  9 Nov 2017 19:05:47 +0200
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Will Deacon <will.deacon@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH 3/4] perf tools: Add 'suppress_aux' attribute bit definition and fallback

This adds support for suppress_aux, the switch that enables suppressing
not-so-useful PERF_RECORD_AUX records. Also handle kernels where it's
not supported.

Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
 tools/perf/util/evsel.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index f894893c203d..794e56b42c20 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -50,6 +50,7 @@ static struct {
 	bool lbr_flags;
 	bool write_backward;
 	bool group_read;
+	bool suppress_aux;
 } perf_missing_features;
 
 static clockid_t clockid;
@@ -1570,6 +1571,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
 	PRINT_ATTRf(use_clockid, p_unsigned);
 	PRINT_ATTRf(context_switch, p_unsigned);
 	PRINT_ATTRf(write_backward, p_unsigned);
+	PRINT_ATTRf(suppress_aux, p_unsigned);
 
 	PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
 	PRINT_ATTRf(bp_type, p_unsigned);
@@ -1686,6 +1688,8 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
 				     PERF_SAMPLE_BRANCH_NO_CYCLES);
 	if (perf_missing_features.group_read && evsel->attr.inherit)
 		evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
+	if (perf_missing_features.suppress_aux && evsel->attr.suppress_aux)
+		evsel->attr.suppress_aux = 0;
 retry_sample_id:
 	if (perf_missing_features.sample_id_all)
 		evsel->attr.sample_id_all = 0;
@@ -1847,6 +1851,11 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
 		perf_missing_features.group_read = true;
 		pr_debug2("switching off group read\n");
 		goto fallback_missing_features;
+	} else if (!perf_missing_features.suppress_aux &&
+		   evsel->attr.suppress_aux) {
+		perf_missing_features.suppress_aux = true;
+		pr_debug2("switching off suppress_aux\n");
+		goto fallback_missing_features;
 	}
 out_close:
 	do {
-- 
2.14.2