linux-kernel - [PATCH V7 10/15] perf evlist: Disable 'immediate' events last

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Date:   Tue, 12 May 2020 15:19:17 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>, Jiri Olsa <jolsa@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH V7 10/15] perf evlist: Disable 'immediate' events last

Events marked as 'immediate' are started before other events to ensure
that there is context at the start of the main tracing events. The same
is true at the end of tracing, so disable 'immediate' events after other
events.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/evlist.c | 31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 2a9de6491700..173b4f0e0e6e 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -380,22 +380,33 @@ void evlist__disable(struct evlist *evlist)
 {
 	struct evsel *pos;
 	struct affinity affinity;
-	int cpu, i;
+	int cpu, i, imm = 0;
+	bool has_imm = false;
 
 	if (affinity__setup(&affinity) < 0)
 		return;
 
-	evlist__for_each_cpu(evlist, i, cpu) {
-		affinity__set(&affinity, cpu);
-
-		evlist__for_each_entry(evlist, pos) {
-			if (evsel__cpu_iter_skip(pos, cpu))
-				continue;
-			if (pos->disabled || !evsel__is_group_leader(pos) || !pos->core.fd)
-				continue;
-			evsel__disable_cpu(pos, pos->cpu_iter - 1);
+	/* Disable 'immediate' events last */
+	for (imm = 0; imm <= 1; imm++) {
+		evlist__for_each_cpu(evlist, i, cpu) {
+			affinity__set(&affinity, cpu);
+
+			evlist__for_each_entry(evlist, pos) {
+				if (evsel__cpu_iter_skip(pos, cpu))
+					continue;
+				if (pos->disabled || !evsel__is_group_leader(pos) || !pos->core.fd)
+					continue;
+				if (pos->immediate)
+					has_imm = true;
+				if (pos->immediate != imm)
+					continue;
+				evsel__disable_cpu(pos, pos->cpu_iter - 1);
+			}
 		}
+		if (!has_imm)
+			break;
 	}
+
 	affinity__cleanup(&affinity);
 	evlist__for_each_entry(evlist, pos) {
 		if (!evsel__is_group_leader(pos) || !pos->core.fd)
-- 
2.17.1