linux-kernel - [PATCH 4/4] perf evlist: No need to setup affinities when disabling events for pid targets

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Date:   Mon, 17 Jan 2022 13:09:31 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH 4/4] perf evlist: No need to setup affinities when disabling events for pid targets

From: Arnaldo Carvalho de Melo <acme@...hat.com>

When the target is a pid, not started by 'perf stat' we need to disable
the events, and in that case there is no need to setup affinities as we
use a dummy CPU map, with just one entry set to -1.

So stop doing it to avoid this needless call to sched_getaffinity():

  # strace -ke sched_getaffinity perf stat -e cycles -p 241957 sleep 1
  <SNIP>
  sched_getaffinity(0, 512, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31]) = 8
   > /usr/lib64/libc-2.33.so(sched_getaffinity@@GLIBC_2.3.4+0x1a) [0xe6eea]
   > /var/home/acme/bin/perf(affinity__setup+0x6a) [0x532a2a]
   > /var/home/acme/bin/perf(__evlist__disable.constprop.0+0x27) [0x4b9827]
   > /var/home/acme/bin/perf(cmd_stat+0x29b5) [0x431725]
   > /var/home/acme/bin/perf(run_builtin+0x6a) [0x4a2cfa]
   > /var/home/acme/bin/perf(main+0x612) [0x40f8c2]
   > /usr/lib64/libc-2.33.so(__libc_start_main+0xd4) [0x27b74]
   > /var/home/acme/bin/perf(_start+0x2d) [0x40fadd]
  <SNIP>

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: Ian Rogers <irogers@...gle.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evlist.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index ae6d4363da76ec56..eaad04e1672a4752 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -430,15 +430,19 @@ static void __evlist__disable(struct evlist *evlist, char *evsel_name)
 {
 	struct evsel *pos;
 	struct evlist_cpu_iterator evlist_cpu_itr;
-	struct affinity affinity;
+	struct affinity saved_affinity, *affinity = NULL;
 	bool has_imm = false;
 
-	if (affinity__setup(&affinity) < 0)
-		return;
+	// See explanation in evlist__close()
+	if (!cpu_map__is_dummy(evlist->core.cpus)) {
+		if (affinity__setup(&saved_affinity) < 0)
+			return;
+		affinity = &saved_affinity;
+	}
 
 	/* Disable 'immediate' events last */
 	for (int imm = 0; imm <= 1; imm++) {
-		evlist__for_each_cpu(evlist_cpu_itr, evlist, &affinity) {
+		evlist__for_each_cpu(evlist_cpu_itr, evlist, affinity) {
 			pos = evlist_cpu_itr.evsel;
 			if (evsel__strcmp(pos, evsel_name))
 				continue;
@@ -454,7 +458,7 @@ static void __evlist__disable(struct evlist *evlist, char *evsel_name)
 			break;
 	}
 
-	affinity__cleanup(&affinity);
+	affinity__cleanup(affinity);
 	evlist__for_each_entry(evlist, pos) {
 		if (evsel__strcmp(pos, evsel_name))
 			continue;
-- 
2.34.1