linux-kernel - [007/121] perf tools: Add anonymous huge page recognition

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Date:	Sun, 08 Sep 2013 03:52:01 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "David Ahern" <dsahern@...il.com>,
	"Andi Kleen" <andi@...stfloor.org>,
	"Ingo Molnar" <mingo@...hat.com>,
	"Paul Mackerras" <paulus@...ba.org>,
	"Akihiro Nagai" <akihiro.nagai.hw@...achi.com>,
	"Arnaldo Carvalho de Melo" <acme@...hat.com>,
	"Namhyung Kim" <namhyung@...nel.org>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Jiri Olsa" <jolsa@...hat.com>, "Joshua Zhu" <zhu.wen-jie@...com>
Subject: [007/121] perf tools: Add anonymous huge page recognition

3.2.51-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Joshua Zhu <zhu.wen-jie@...com>

commit d0528b5d71faf612014dd7672e44225c915344b2 upstream.

Judging anonymous memory's vm_area_struct, perf_mmap_event's filename
will be set to "//anon" indicating this vma belongs to anonymous
memory.

Once hugepage is used, vma's vm_file points to hugetlbfs. In this way,
this vma will not be regarded as anonymous memory by is_anon_memory() in
perf user space utility.

Signed-off-by: Joshua Zhu <zhu.wen-jie@...com>
Cc: Akihiro Nagai <akihiro.nagai.hw@...achi.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Joshua Zhu <zhu.wen-jie@...com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1357363797-3550-1-git-send-email-zhu.wen-jie@hp.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 tools/perf/util/map.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -15,7 +15,8 @@ const char *map_type__name[MAP__NR_TYPES
 
 static inline int is_anon_memory(const char *filename)
 {
-	return strcmp(filename, "//anon") == 0;
+	return !strcmp(filename, "//anon") ||
+	       !strcmp(filename, "/anon_hugepage (deleted)");
 }
 
 static inline int is_no_dso_memory(const char *filename)

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