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| author | Ingo Molnar <mingo@elte.hu> | 2007-08-23 13:18:02 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-08-23 13:18:02 (GMT) |
| commit | 2aa44d0567ed21b47b87d68819415d48194cb923 (patch) | |
| tree | 7be2a8a30a23b363e1e2aecd41934e75f581e115 /include/linux | |
| parent | b377fd3982ad957c796758a90e2988401a884241 (diff) | |
| download | linux-fsl-qoriq-2aa44d0567ed21b47b87d68819415d48194cb923.tar.xz | |
sched: sched_clock_idle_[sleep|wakeup]_event()
construct a more or less wall-clock time out of sched_clock(), by
using ACPI-idle's existing knowledge about how much time we spent
idling. This allows the rq clock to work around TSC-stops-in-C2,
TSC-gets-corrupted-in-C3 type of problems.
( Besides the scheduler's statistics this also benefits blktrace and
printk-timestamps as well. )
Furthermore, the precise before-C2/C3-sleep and after-C2/C3-wakeup
callbacks allow the scheduler to get out the most of the period where
the CPU has a reliable TSC. This results in slightly more precise
task statistics.
the ACPI bits were acked by Len.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/sched.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 682ef87..1845b2e 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1388,7 +1388,8 @@ extern void sched_exec(void); #define sched_exec() {} #endif -extern void sched_clock_unstable_event(void); +extern void sched_clock_idle_sleep_event(void); +extern void sched_clock_idle_wakeup_event(u64 delta_ns); #ifdef CONFIG_HOTPLUG_CPU extern void idle_task_exit(void); |