linux-kernel - [PATCH] perf: Correctly identify anon

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Date:	Wed, 7 Oct 2015 17:31:46 -0700
From:	Yannick Brosseau <scientist@...com>
To:	<acme@...nel.org>, <linux-kernel@...r.kernel.org>,
	<kernel-team@...com>
CC:	<zhu.wen-jie@...com>, <ak@...ux.intel.com>,
	Yannick Brosseau <scientist@...com>
Subject: [PATCH] perf: Correctly identify anon_hugepage when generating map

When parsing /proc/xxx/maps, the sscanf in perf_event__synthesize_mmap_events
truncate the map name at the space in "/anon_hugepage (deleted)".
is_anon_memory then only receive the string "/anon_hugepage" and do not detect it.
We change is_anon_memory to only compare the first part of the string
effectively ignoring if the (deleted) part is there or not.

Signed-off-by: Yannick Brosseau <scientist@...com>
---
 tools/perf/util/map.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index b1c475d..9f7face 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -26,8 +26,8 @@ const char *map_type__name[MAP__NR_TYPES] = {
 static inline int is_anon_memory(const char *filename)
 {
 	return !strcmp(filename, "//anon") ||
-	       !strcmp(filename, "/dev/zero (deleted)") ||
-	       !strcmp(filename, "/anon_hugepage (deleted)");
+	       !strncmp(filename, "/dev/zero", sizeof("/dev/zero")) ||
+	       !strncmp(filename, "/anon_hugepage", sizeof("/anon_hugepage"));
 }
 
 static inline int is_no_dso_memory(const char *filename)
-- 
2.6.0

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