diff options
| author | Ingo Molnar <mingo@elte.hu> | 2007-08-23 15:18:02 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-08-23 15:18:02 +0200 |
| commit | 2aa44d0567ed21b47b87d68819415d48194cb923 (patch) | |
| tree | 7be2a8a30a23b363e1e2aecd41934e75f581e115 /arch | |
| parent | b377fd3982ad957c796758a90e2988401a884241 (diff) | |
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 'arch')
| -rw-r--r-- | arch/i386/kernel/tsc.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/i386/kernel/tsc.c b/arch/i386/kernel/tsc.c index debd7dbb415..a39280b4dd3 100644 --- a/arch/i386/kernel/tsc.c +++ b/arch/i386/kernel/tsc.c @@ -292,7 +292,6 @@ static struct clocksource clocksource_tsc = { void mark_tsc_unstable(char *reason) { - sched_clock_unstable_event(); if (!tsc_unstable) { tsc_unstable = 1; tsc_enabled = 0; |