diff options
Diffstat (limited to 'Documentation/hrtimer/timer_stats.txt')
| -rw-r--r-- | Documentation/hrtimer/timer_stats.txt | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/hrtimer/timer_stats.txt b/Documentation/hrtimer/timer_stats.txt index 27f782e3593f..22b0814d0ad0 100644 --- a/Documentation/hrtimer/timer_stats.txt +++ b/Documentation/hrtimer/timer_stats.txt | |||
| @@ -2,9 +2,10 @@ timer_stats - timer usage statistics | |||
| 2 | ------------------------------------ | 2 | ------------------------------------ |
| 3 | 3 | ||
| 4 | timer_stats is a debugging facility to make the timer (ab)usage in a Linux | 4 | timer_stats is a debugging facility to make the timer (ab)usage in a Linux |
| 5 | system visible to kernel and userspace developers. It is not intended for | 5 | system visible to kernel and userspace developers. If enabled in the config |
| 6 | production usage as it adds significant overhead to the (hr)timer code and the | 6 | but not used it has almost zero runtime overhead, and a relatively small |
| 7 | (hr)timer data structures. | 7 | data structure overhead. Even if collection is enabled runtime all the |
| 8 | locking is per-CPU and lookup is hashed. | ||
| 8 | 9 | ||
| 9 | timer_stats should be used by kernel and userspace developers to verify that | 10 | timer_stats should be used by kernel and userspace developers to verify that |
| 10 | their code does not make unduly use of timers. This helps to avoid unnecessary | 11 | their code does not make unduly use of timers. This helps to avoid unnecessary |