linux-kernel - [PATCH/RFC 06/16] perf top: Get rid of access to hists->lock in perf_top__record_precise

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Date:	Thu, 10 Dec 2015 16:53:25 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH/RFC 06/16] perf top: Get rid of access to hists->lock in perf_top__record_precise_ip()

It was accessed to release the lock before going to sleep, but now it
doesn't go to sleep anymore since warnings will be shown in the
display thread.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/builtin-top.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index aafcf27c437e..24a5434e8a0b 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -355,20 +355,10 @@ static void perf_top__record_precise_ip(struct perf_top *top,
 
 	pthread_mutex_unlock(&notes->lock);
 
-	if (unlikely(err)) {
-		/*
-		 * This function is now called with hists->lock held.
-		 * Release it before going to sleep.
-		 */
-		pthread_mutex_unlock(&he->hists->lock);
-
-		if (err == -ERANGE)
-			perf_top__request_warning(top, al, WARN_ERANGE);
-		else if (err == -ENOMEM)
-			perf_top__request_warning(top, al, WARN_ENOMEM);
-
-		pthread_mutex_lock(&he->hists->lock);
-	}
+	if (err == -ERANGE)
+		perf_top__request_warning(top, al, WARN_ERANGE);
+	else if (err == -ENOMEM)
+		perf_top__request_warning(top, al, WARN_ENOMEM);
 }
 
 static void perf_top__show_details(struct perf_top *top)
-- 
2.6.2

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