[tip:perf/core] perf fs: Add procfs support

[tip-bot for Jiri Olsa <tipbot@zytor.com>]

Commit-ID:  a9862418547e818aa5842840aecfa81d733b97e9
Gitweb:     http://git.kernel.org/tip/a9862418547e818aa5842840aecfa81d733b97e9
Author:     Jiri Olsa <jolsa@redhat.com>
AuthorDate: Tue, 5 Nov 2013 15:14:46 +0100
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 5 Nov 2013 15:15:07 -0300

perf fs: Add procfs support

Adding procfs support into fs class.

The interface function:
  const char *procfs__mountpoint(void);

provides existing mountpoint path for procfs.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1383660887-1734-3-git-send-email-jolsa@redhat.com
[ Fixup namespace ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/fs.c                  | 16 ++++++++++++++--
 tools/perf/util/fs.h                  |  1 +
 tools/perf/util/include/linux/magic.h |  4 ++++
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/fs.c b/tools/perf/util/fs.c
index 77bac4e..f5be1f2 100644
--- a/tools/perf/util/fs.c
+++ b/tools/perf/util/fs.c
@@ -9,6 +9,11 @@ static const char * const sysfs__fs_known_mountpoints[] = {
 	0,
 };
 
+static const char * const procfs__known_mountpoints[] = {
+	"/proc",
+	0,
+};
+
 struct fs {
 	const char		*name;
 	const char * const	*mounts;
@@ -18,7 +23,8 @@ struct fs {
 };
 
 enum {
-	FS__SYSFS = 0,
+	FS__SYSFS  = 0,
+	FS__PROCFS = 1,
 };
 
 static struct fs fs__entries[] = {
@@ -27,6 +33,11 @@ static struct fs fs__entries[] = {
 		.mounts	= sysfs__fs_known_mountpoints,
 		.magic	= SYSFS_MAGIC,
 	},
+	[FS__PROCFS] = {
+		.name	= "proc",
+		.mounts	= procfs__known_mountpoints,
+		.magic	= PROC_SUPER_MAGIC,
+	},
 };
 
 static bool fs__read_mounts(struct fs *fs)
@@ -104,4 +115,5 @@ const char *name##__mountpoint(void)	\
 	return fs__mountpoint(idx);	\
 }
 
-FS__MOUNTPOINT(sysfs, FS__SYSFS);
+FS__MOUNTPOINT(sysfs,  FS__SYSFS);
+FS__MOUNTPOINT(procfs, FS__PROCFS);
diff --git a/tools/perf/util/fs.h b/tools/perf/util/fs.h
index a7561c8..5e09ce1 100644
--- a/tools/perf/util/fs.h
+++ b/tools/perf/util/fs.h
@@ -2,5 +2,6 @@
 #define __PERF_FS
 
 const char *sysfs__mountpoint(void);
+const char *procfs__mountpoint(void);
 
 #endif /* __PERF_FS */
diff --git a/tools/perf/util/include/linux/magic.h b/tools/perf/util/include/linux/magic.h
index 58b64ed..07d63cf 100644
--- a/tools/perf/util/include/linux/magic.h
+++ b/tools/perf/util/include/linux/magic.h
@@ -9,4 +9,8 @@
 #define SYSFS_MAGIC            0x62656572
 #endif
 
+#ifndef PROC_SUPER_MAGIC
+#define PROC_SUPER_MAGIC       0x9fa0
+#endif
+
 #endif