linux-kernel - [tip:perf/core] perf cgroup: Use atomic.h for refcounting

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Message-ID: <tip-t3v2uma5digcj2tpkrs3m84u@git.kernel.org>
Date:	Wed, 20 May 2015 05:22:30 -0700
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, eranian@...gle.com, bp@...e.de, fweisbec@...il.com,
	dzickus@...hat.com, linux-kernel@...r.kernel.org,
	namhyung@...nel.org, adrian.hunter@...el.com, acme@...hat.com,
	dsahern@...il.com, tglx@...utronix.de, jolsa@...hat.com,
	mingo@...nel.org
Subject: [tip:perf/core] perf cgroup: Use atomic.h for refcounting

Commit-ID:  f812d3045c2385ac16237e68b156859c4005526e
Gitweb:     http://git.kernel.org/tip/f812d3045c2385ac16237e68b156859c4005526e
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Fri, 15 May 2015 16:12:20 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 15 May 2015 16:12:20 -0300

perf cgroup: Use atomic.h for refcounting

Now that we have atomic.h, we should convert all of the existing
refcounts to use it.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: David Ahern <dsahern@...il.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-t3v2uma5digcj2tpkrs3m84u@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/cgroup.c | 10 +++-------
 tools/perf/util/cgroup.h |  4 +++-
 2 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
index 88f7be3..32e12ec 100644
--- a/tools/perf/util/cgroup.c
+++ b/tools/perf/util/cgroup.c
@@ -115,23 +115,19 @@ static int add_cgroup(struct perf_evlist *evlist, char *str)
 			goto found;
 		n++;
 	}
-	if (cgrp->refcnt == 0)
+	if (atomic_read(&cgrp->refcnt) == 0)
 		free(cgrp);
 
 	return -1;
 found:
-	cgrp->refcnt++;
+	atomic_inc(&cgrp->refcnt);
 	counter->cgrp = cgrp;
 	return 0;
 }
 
 void close_cgroup(struct cgroup_sel *cgrp)
 {
-	if (!cgrp)
-		return;
-
-	/* XXX: not reentrant */
-	if (--cgrp->refcnt == 0) {
+	if (cgrp && atomic_dec_and_test(&cgrp->refcnt)) {
 		close(cgrp->fd);
 		zfree(&cgrp->name);
 		free(cgrp);
diff --git a/tools/perf/util/cgroup.h b/tools/perf/util/cgroup.h
index 89acd6d..b4b8cb4 100644
--- a/tools/perf/util/cgroup.h
+++ b/tools/perf/util/cgroup.h
@@ -1,12 +1,14 @@
 #ifndef __CGROUP_H__
 #define __CGROUP_H__
 
+#include <linux/atomic.h>
+
 struct option;
 
 struct cgroup_sel {
 	char *name;
 	int fd;
-	int refcnt;
+	atomic_t refcnt;
 };
 
 
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