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| author | Ingo Molnar <mingo@elte.hu> | 2008-07-30 10:13:35 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-31 17:20:49 +0200 |
| commit | 18e4e36c66d6edbdefc639692206cdf01e468713 (patch) | |
| tree | 271a70892fa5808459a1cfc30aa3b5631cd6647d | |
| parent | 50526968e99afbca34924abcb04658b6dd5c5ea5 (diff) | |
| download | linux-18e4e36c66d6edbdefc639692206cdf01e468713.tar.gz linux-18e4e36c66d6edbdefc639692206cdf01e468713.tar.bz2 linux-18e4e36c66d6edbdefc639692206cdf01e468713.zip | |
sched: eliminate scd->prev_raw
eliminate prev_raw and use tick_raw instead.
It's enough to base the current time on the scheduler tick timestamp
alone - the monotonicity and maximum checks will prevent any damage.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Mike Galbraith <efault@gmx.de>
| -rw-r--r-- | kernel/sched_clock.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c index b96559cb96a5..4b8474c966dc 100644 --- a/kernel/sched_clock.c +++ b/kernel/sched_clock.c @@ -53,7 +53,6 @@ struct sched_clock_data { raw_spinlock_t lock; unsigned long tick_jiffies; - u64 prev_raw; u64 tick_raw; u64 tick_gtod; u64 clock; @@ -84,7 +83,6 @@ void sched_clock_init(void) scd->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; scd->tick_jiffies = now_jiffies; - scd->prev_raw = 0; scd->tick_raw = 0; scd->tick_gtod = ktime_now; scd->clock = ktime_now; @@ -105,7 +103,7 @@ static void __update_sched_clock(struct sched_clock_data *scd, u64 now) long delta_jiffies = now_jiffies - scd->tick_jiffies; u64 clock = scd->clock; u64 min_clock, max_clock; - s64 delta = now - scd->prev_raw; + s64 delta = now - scd->tick_raw; WARN_ON_ONCE(!irqs_disabled()); min_clock = scd->tick_gtod + delta_jiffies * TICK_NSEC; @@ -130,7 +128,6 @@ static void __update_sched_clock(struct sched_clock_data *scd, u64 now) if (unlikely(clock < min_clock)) clock = min_clock; - scd->prev_raw = now; scd->tick_jiffies = now_jiffies; scd->clock = clock; } @@ -234,7 +231,6 @@ void sched_clock_idle_wakeup_event(u64 delta_ns) * rq clock: */ __raw_spin_lock(&scd->lock); - scd->prev_raw = now; scd->clock += delta_ns; __raw_spin_unlock(&scd->lock); |