linux-kernel - [tip:perf/core] perf evlist: Extract common code in mmap failure processing

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Message-ID: <tip-a1f72618346a4e7ce9cff6aec1a62737d5d08763@git.kernel.org>
Date:	Sat, 16 Jul 2016 13:48:05 -0700
From:	tip-bot for Wang Nan <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org, hekuang@...wei.com,
	acme@...hat.com, namhyung@...nel.org, mhiramat@...nel.org,
	nilayvaish@...il.com, hpa@...or.com, wangnan0@...wei.com,
	lizefan@...wei.com, tglx@...utronix.de, jolsa@...nel.org
Subject: [tip:perf/core] perf evlist: Extract common code in mmap failure
 processing

Commit-ID:  a1f72618346a4e7ce9cff6aec1a62737d5d08763
Gitweb:     http://git.kernel.org/tip/a1f72618346a4e7ce9cff6aec1a62737d5d08763
Author:     Wang Nan <wangnan0@...wei.com>
AuthorDate: Thu, 14 Jul 2016 08:34:38 +0000
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 15 Jul 2016 17:27:47 -0300

perf evlist: Extract common code in mmap failure processing

In perf_evlist__mmap_per_cpu() and perf_evlist__mmap_per_thread(), in
case of mmap failure, successfully created maps should be cleared.

Current code uses two loops calling __perf_evlist__munmap() for each
function.

This patch extracts common code to perf_evlist__munmap_nofree() and use
previous introduced decoupled API perf_mmap__munmap(). Now
__perf_evlist__munmap() can be removed because of no user.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Cc: He Kuang <hekuang@...wei.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Nilay Vaish <nilayvaish@...il.com>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
Link: http://lkml.kernel.org/r/1468485287-33422-7-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evlist.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 1462085..54ae0a0 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -28,7 +28,6 @@
 #include <linux/err.h>
 
 static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx);
-static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx);
 static void perf_mmap__munmap(struct perf_mmap *map);
 static void perf_mmap__put(struct perf_mmap *map);
 
@@ -970,12 +969,7 @@ static void perf_mmap__munmap(struct perf_mmap *map)
 	auxtrace_mmap__munmap(&map->auxtrace_mmap);
 }
 
-static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
-{
-	perf_mmap__munmap(&evlist->mmap[idx]);
-}
-
-void perf_evlist__munmap(struct perf_evlist *evlist)
+static void perf_evlist__munmap_nofree(struct perf_evlist *evlist)
 {
 	int i;
 
@@ -983,8 +977,12 @@ void perf_evlist__munmap(struct perf_evlist *evlist)
 		return;
 
 	for (i = 0; i < evlist->nr_mmaps; i++)
-		__perf_evlist__munmap(evlist, i);
+		perf_mmap__munmap(&evlist->mmap[i]);
+}
 
+void perf_evlist__munmap(struct perf_evlist *evlist)
+{
+	perf_evlist__munmap_nofree(evlist);
 	zfree(&evlist->mmap);
 }
 
@@ -1142,8 +1140,7 @@ static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist,
 	return 0;
 
 out_unmap:
-	for (cpu = 0; cpu < nr_cpus; cpu++)
-		__perf_evlist__munmap(evlist, cpu);
+	perf_evlist__munmap_nofree(evlist);
 	return -1;
 }
 
@@ -1168,8 +1165,7 @@ static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist,
 	return 0;
 
 out_unmap:
-	for (thread = 0; thread < nr_threads; thread++)
-		__perf_evlist__munmap(evlist, thread);
+	perf_evlist__munmap_nofree(evlist);
 	return -1;
 }