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author | Ingo Molnar <mingo@elte.hu> | 2007-02-16 01:28:13 -0800 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-16 08:13:59 -0800 |
commit | 82f67cd9fca8c8762c15ba7ed0d5747588c1e221 (patch) | |
tree | 1ff7e5cc496580b85bb42fb1d7b19dcbef7b7776 /include/linux/timer.h | |
parent | 8bfd9a7a229b5f3d3eda5d7d45c2eebec5b4ba16 (diff) | |
download | linux-3.10-82f67cd9fca8c8762c15ba7ed0d5747588c1e221.tar.gz linux-3.10-82f67cd9fca8c8762c15ba7ed0d5747588c1e221.tar.bz2 linux-3.10-82f67cd9fca8c8762c15ba7ed0d5747588c1e221.zip |
[PATCH] Add debugging feature /proc/timer_stat
Add /proc/timer_stats support: debugging feature to profile timer expiration.
Both the starting site, process/PID and the expiration function is captured.
This allows the quick identification of timer event sources in a system.
Sample output:
# echo 1 > /proc/timer_stats
# cat /proc/timer_stats
Timer Stats Version: v0.1
Sample period: 4.010 s
24, 0 swapper hrtimer_stop_sched_tick (hrtimer_sched_tick)
11, 0 swapper sk_reset_timer (tcp_delack_timer)
6, 0 swapper hrtimer_stop_sched_tick (hrtimer_sched_tick)
2, 1 swapper queue_delayed_work_on (delayed_work_timer_fn)
17, 0 swapper hrtimer_restart_sched_tick (hrtimer_sched_tick)
2, 1 swapper queue_delayed_work_on (delayed_work_timer_fn)
4, 2050 pcscd do_nanosleep (hrtimer_wakeup)
5, 4179 sshd sk_reset_timer (tcp_write_timer)
4, 2248 yum-updatesd schedule_timeout (process_timeout)
18, 0 swapper hrtimer_restart_sched_tick (hrtimer_sched_tick)
3, 0 swapper sk_reset_timer (tcp_delack_timer)
1, 1 swapper neigh_table_init_no_netlink (neigh_periodic_timer)
2, 1 swapper e1000_up (e1000_watchdog)
1, 1 init schedule_timeout (process_timeout)
100 total events, 25.24 events/sec
[ cleanups and hrtimers support from Thomas Gleixner <tglx@linutronix.de> ]
[bunk@stusta.de: nr_entries can become static]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/timer.h')
-rw-r--r-- | include/linux/timer.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/include/linux/timer.h b/include/linux/timer.h index 44d41e9d781..719113b652d 100644 --- a/include/linux/timer.h +++ b/include/linux/timer.h @@ -2,6 +2,7 @@ #define _LINUX_TIMER_H #include <linux/list.h> +#include <linux/ktime.h> #include <linux/spinlock.h> #include <linux/stddef.h> @@ -15,6 +16,11 @@ struct timer_list { unsigned long data; struct tvec_t_base_s *base; +#ifdef CONFIG_TIMER_STATS + void *start_site; + char start_comm[16]; + int start_pid; +#endif }; extern struct tvec_t_base_s boot_tvec_bases; @@ -73,6 +79,54 @@ extern unsigned long next_timer_interrupt(void); */ extern unsigned long get_next_timer_interrupt(unsigned long now); +/* + * Timer-statistics info: + */ +#ifdef CONFIG_TIMER_STATS + +extern void init_timer_stats(void); + +extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf, + void *timerf, char * comm); + +static inline void timer_stats_account_timer(struct timer_list *timer) +{ + timer_stats_update_stats(timer, timer->start_pid, timer->start_site, + timer->function, timer->start_comm); +} + +extern void __timer_stats_timer_set_start_info(struct timer_list *timer, + void *addr); + +static inline void timer_stats_timer_set_start_info(struct timer_list *timer) +{ + __timer_stats_timer_set_start_info(timer, __builtin_return_address(0)); +} + +static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) +{ + timer->start_site = NULL; +} +#else +static inline void init_timer_stats(void) +{ +} + +static inline void timer_stats_account_timer(struct timer_list *timer) +{ +} + +static inline void timer_stats_timer_set_start_info(struct timer_list *timer) +{ +} + +static inline void timer_stats_timer_clear_start_info(struct timer_list *timer) +{ +} +#endif + +extern void delayed_work_timer_fn(unsigned long __data); + /** * add_timer - start a timer * @timer: the timer to be added |