diff options
| author | Ingo Molnar <mingo@elte.hu> | 2006-12-06 20:37:24 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:39:36 -0800 |
| commit | ece8a684c75df215320b4155944979e3f78c5c93 (patch) | |
| tree | 2a65e786dd70ab368c12836a39c36070c0e4974f /include/linux/profile.h | |
| parent | 70888bd5b70579e278d5ef1b7e1ec6a420d38b9e (diff) | |
| download | lwn-ece8a684c75df215320b4155944979e3f78c5c93.tar.gz lwn-ece8a684c75df215320b4155944979e3f78c5c93.zip | |
[PATCH] sleep profiling
Implement prof=sleep profiling. TASK_UNINTERRUPTIBLE sleeps will be taken
as a profile hit, and every millisecond spent sleeping causes a profile-hit
for the call site that initiated the sleep.
Sample readprofile output on i386:
306 ps2_sendbyte 1.3973
432 call_usermodehelper_keys 1.9548
484 ps2_command 0.6453
790 __driver_attach 4.7879
1593 msleep 44.2500
3976 sync_buffer 64.1290
4076 do_lookup 12.4648
8587 sync_page 122.6714
20820 total 0.0067
(NOTE: architectures need to check whether get_wchan() can be called from
deep within the wakeup path.)
akpm: we need to mark more functions __sched. lock_sock(), msleep(), others..
akpm: the contention in do_lookup() is a surprise. Presumably doing disk
reads for directory contents while holding i_mutex.
[akpm@osdl.org: various fixes]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/profile.h')
| -rw-r--r-- | include/linux/profile.h | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/include/linux/profile.h b/include/linux/profile.h index acce53fd38b6..5670b340c4ef 100644 --- a/include/linux/profile.h +++ b/include/linux/profile.h @@ -6,10 +6,15 @@ #include <linux/kernel.h> #include <linux/init.h> #include <linux/cpumask.h> +#include <linux/cache.h> + #include <asm/errno.h> +extern int prof_on __read_mostly; + #define CPU_PROFILING 1 #define SCHED_PROFILING 2 +#define SLEEP_PROFILING 3 struct proc_dir_entry; struct pt_regs; @@ -18,7 +23,24 @@ struct notifier_block; /* init basic kernel profiler */ void __init profile_init(void); void profile_tick(int); -void profile_hit(int, void *); + +/* + * Add multiple profiler hits to a given address: + */ +void profile_hits(int, void *ip, unsigned int nr_hits); + +/* + * Single profiler hit: + */ +static inline void profile_hit(int type, void *ip) +{ + /* + * Speedup for the common (no profiling enabled) case: + */ + if (unlikely(prof_on == type)) + profile_hits(type, ip, 1); +} + #ifdef CONFIG_PROC_FS void create_prof_cpu_mask(struct proc_dir_entry *); #else |