linux-kernel - [PATCH v2 5/7] perf tools: add perf_evlist_

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Date:   Thu, 23 Jan 2020 16:07:32 +0000
From:   James Clark <james.clark@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     suzuki.poulose@....com, gengdongjiu@...wei.com,
        wxf.wang@...ilicon.com, liwei391@...wei.com,
        liuqi115@...ilicon.com, huawei.libin@...wei.com, nd@....com,
        linux-perf-users@...r.kernel.org,
        James Clark <james.clark@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Tan Xiaojun <tanxiaojun@...wei.com>,
        Al Grant <al.grant@....com>, Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH v2 5/7] perf tools: add perf_evlist__terminate() for terminate

From: Wei Li <liwei391@...wei.com>

In __cmd_record(), when receiving SIGINT(ctrl + c), a done flag will
be set and the event list will be disabled by perf_evlist__disable()
once.

While in auxtrace_record.read_finish(), the related events will be
enabled again, if they are continuous, the recording seems to be endless.

Mark the evlist's state as terminated, preparing for the following fix.

Signed-off-by: Wei Li <liwei391@...wei.com>
Tested-by: Qi Liu <liuqi115@...ilicon.com>
Signed-off-by: James Clark <james.clark@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Tan Xiaojun <tanxiaojun@...wei.com>
Cc: Al Grant <al.grant@....com>
Cc: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/builtin-record.c |  1 +
 tools/perf/util/evlist.c    | 14 ++++++++++++++
 tools/perf/util/evlist.h    |  1 +
 tools/perf/util/evsel.h     |  1 +
 4 files changed, 17 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 4c301466101b..e7c917f9534d 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1722,6 +1722,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 		if (done && !disabled && !target__none(&opts->target)) {
 			trigger_off(&auxtrace_snapshot_trigger);
 			evlist__disable(rec->evlist);
+			evlist__terminate(rec->evlist);
 			disabled = true;
 		}
 	}
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index b9c7e5271611..b04794cd8586 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -377,6 +377,20 @@ bool evsel__cpu_iter_skip(struct evsel *ev, int cpu)
 	return true;
 }
 
+void evlist__terminate(struct evlist *evlist)
+{
+	struct evsel *pos;
+
+	evlist__for_each_entry(evlist, pos) {
+		if (pos->disabled || !perf_evsel__is_group_leader(pos) || !pos->core.fd)
+			continue;
+		evsel__disable(pos);
+		pos->terminated = true;
+	}
+
+	evlist->enabled = false;
+}
+
 void evlist__disable(struct evlist *evlist)
 {
 	struct evsel *pos;
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index f5bd5c386df1..9fbd0ce2a1c4 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -206,6 +206,7 @@ void evlist__munmap(struct evlist *evlist);
 
 size_t evlist__mmap_size(unsigned long pages);
 
+void evlist__terminate(struct evlist *evlist);
 void evlist__disable(struct evlist *evlist);
 void evlist__enable(struct evlist *evlist);
 void perf_evlist__toggle_enable(struct evlist *evlist);
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index dc14f4a823cd..8e8a2cb41de8 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -104,6 +104,7 @@ struct evsel {
 		perf_evsel__sb_cb_t	*cb;
 		void			*data;
 	} side_band;
+	bool			terminated;
 };
 
 struct perf_missing_features {
-- 
2.25.0