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authorXiao Guangrong <xiaoguangrong@cn.fujitsu.com>2009-12-28 03:47:12 -0500
committerIngo Molnar <mingo@elte.hu>2009-12-28 04:36:36 -0500
commit29c52aa2300173dd45df04dae1f5acc81a2c93b1 (patch)
treec27098eaff73c07d06420d43ce81683ed1bca612 /tools
parent07b139c8c81b97bbe55c68daf0cbeca8b1c609ca (diff)
perf tools: Mount debugfs automatically
Mount debugfs filesystem under '/sys/kernel/debug', if it's not mounted. Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Clark Williams <williams@redhat.com> Cc: John Kacur <jkacur@redhat.com> LKML-Reference: <4B387090.7080407@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/perf.c2
-rw-r--r--tools/perf/util/debugfs.c16
-rw-r--r--tools/perf/util/debugfs.h2
3 files changed, 9 insertions, 11 deletions
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 873e55fab375..fc89005c3e51 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -388,7 +388,7 @@ static int run_argv(int *argcp, const char ***argv)
388/* mini /proc/mounts parser: searching for "^blah /mount/point debugfs" */ 388/* mini /proc/mounts parser: searching for "^blah /mount/point debugfs" */
389static void get_debugfs_mntpt(void) 389static void get_debugfs_mntpt(void)
390{ 390{
391 const char *path = debugfs_find_mountpoint(); 391 const char *path = debugfs_mount(NULL);
392 392
393 if (path) 393 if (path)
394 strncpy(debugfs_mntpt, path, sizeof(debugfs_mntpt)); 394 strncpy(debugfs_mntpt, path, sizeof(debugfs_mntpt));
diff --git a/tools/perf/util/debugfs.c b/tools/perf/util/debugfs.c
index 06b73ee02c49..1f805fde5fd4 100644
--- a/tools/perf/util/debugfs.c
+++ b/tools/perf/util/debugfs.c
@@ -106,16 +106,14 @@ int debugfs_valid_entry(const char *path)
106 return 0; 106 return 0;
107} 107}
108 108
109/* mount the debugfs somewhere */ 109/* mount the debugfs somewhere if it's not mounted */
110 110
111int debugfs_mount(const char *mountpoint) 111char *debugfs_mount(const char *mountpoint)
112{ 112{
113 char mountcmd[128];
114
115 /* see if it's already mounted */ 113 /* see if it's already mounted */
116 if (debugfs_find_mountpoint()) { 114 if (debugfs_find_mountpoint()) {
117 debugfs_premounted = 1; 115 debugfs_premounted = 1;
118 return 0; 116 return debugfs_mountpoint;
119 } 117 }
120 118
121 /* if not mounted and no argument */ 119 /* if not mounted and no argument */
@@ -127,13 +125,13 @@ int debugfs_mount(const char *mountpoint)
127 mountpoint = "/sys/kernel/debug"; 125 mountpoint = "/sys/kernel/debug";
128 } 126 }
129 127
128 if (mount(NULL, mountpoint, "debugfs", 0, NULL) < 0)
129 return NULL;
130
130 /* save the mountpoint */ 131 /* save the mountpoint */
131 strncpy(debugfs_mountpoint, mountpoint, sizeof(debugfs_mountpoint)); 132 strncpy(debugfs_mountpoint, mountpoint, sizeof(debugfs_mountpoint));
132 133
133 /* mount it */ 134 return debugfs_mountpoint;
134 snprintf(mountcmd, sizeof(mountcmd),
135 "/bin/mount -t debugfs debugfs %s", mountpoint);
136 return system(mountcmd);
137} 135}
138 136
139/* umount the debugfs */ 137/* umount the debugfs */
diff --git a/tools/perf/util/debugfs.h b/tools/perf/util/debugfs.h
index 3cd14f9ae784..83a02879745f 100644
--- a/tools/perf/util/debugfs.h
+++ b/tools/perf/util/debugfs.h
@@ -15,7 +15,7 @@
15extern const char *debugfs_find_mountpoint(void); 15extern const char *debugfs_find_mountpoint(void);
16extern int debugfs_valid_mountpoint(const char *debugfs); 16extern int debugfs_valid_mountpoint(const char *debugfs);
17extern int debugfs_valid_entry(const char *path); 17extern int debugfs_valid_entry(const char *path);
18extern int debugfs_mount(const char *mountpoint); 18extern char *debugfs_mount(const char *mountpoint);
19extern int debugfs_umount(void); 19extern int debugfs_umount(void);
20extern int debugfs_write(const char *entry, const char *value); 20extern int debugfs_write(const char *entry, const char *value);
21extern int debugfs_read(const char *entry, char *buffer, size_t size); 21extern int debugfs_read(const char *entry, char *buffer, size_t size);