linux-kernel - [PATCH 10/26] perf tools: Enable mmap3 map event when supported

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Date:   Sun, 13 Sep 2020 23:02:57 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Song Liu <songliubraving@...com>,
        "Frank Ch. Eigler" <fche@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH 10/26] perf tools: Enable mmap3 map event when supported

Enabling mmap3 map event when supported and adding
its disable fallback when it fails.

Also adding mmap3 bit to verbose open output:

  $ perf record -vv kill
  perf_event_attr:
    size                             120
    { sample_period, sample_freq }   4000
    ...
    bpf_event                        1
    mmap3                            1

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/evsel.c                   | 9 ++++++++-
 tools/perf/util/evsel.h                   | 1 +
 tools/perf/util/perf_event_attr_fprintf.c | 1 +
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 14baf8542b40..c2cc9b4b30bf 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1065,6 +1065,7 @@ void evsel__config(struct evsel *evsel, struct record_opts *opts,
 	attr->task  = track;
 	attr->mmap  = track;
 	attr->mmap2 = track && !perf_missing_features.mmap2;
+	attr->mmap3 = track && !perf_missing_features.mmap3;
 	attr->comm  = track;
 	/*
 	 * ksymbol is tracked separately with text poke because it needs to be
@@ -1657,6 +1658,8 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
 		evsel->core.attr.bpf_event = 0;
 	if (perf_missing_features.branch_hw_idx)
 		evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX;
+	if (perf_missing_features.mmap3)
+		evsel->core.attr.mmap3 = 0;
 retry_sample_id:
 	if (perf_missing_features.sample_id_all)
 		evsel->core.attr.sample_id_all = 0;
@@ -1770,7 +1773,11 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
 	 * Must probe features in the order they were added to the
 	 * perf_event_attr interface.
 	 */
-        if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) {
+	if (!perf_missing_features.mmap3 && evsel->core.attr.mmap3) {
+		perf_missing_features.mmap3 = true;
+		pr_debug2("switching off mmap3\n");
+		goto fallback_missing_features;
+	} else if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) {
 		perf_missing_features.cgroup = true;
 		pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n");
 		goto out_close;
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 35e3f6d66085..d49922b22eca 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -119,6 +119,7 @@ struct perf_missing_features {
 	bool sample_id_all;
 	bool exclude_guest;
 	bool mmap2;
+	bool mmap3;
 	bool cloexec;
 	bool clockid;
 	bool clockid_wrong;
diff --git a/tools/perf/util/perf_event_attr_fprintf.c b/tools/perf/util/perf_event_attr_fprintf.c
index e67a227c0ce7..3c52c081693d 100644
--- a/tools/perf/util/perf_event_attr_fprintf.c
+++ b/tools/perf/util/perf_event_attr_fprintf.c
@@ -134,6 +134,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
 	PRINT_ATTRf(bpf_event, p_unsigned);
 	PRINT_ATTRf(aux_output, p_unsigned);
 	PRINT_ATTRf(cgroup, p_unsigned);
+	PRINT_ATTRf(mmap3, p_unsigned);
 
 	PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
 	PRINT_ATTRf(bp_type, p_unsigned);
-- 
2.26.2