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| author | Arjan van de Ven <arjan@linux.intel.com> | 2010-05-09 17:22:45 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-05-09 19:35:25 +0200 |
| commit | 595aac488b546c7185be7e29c8ae165a588b2a9f (patch) | |
| tree | 5037879b01cbcb7cf84f4ab99a114aca687f0300 /kernel/time | |
| parent | sched: Add a comment to get_cpu_idle_time_us() (diff) | |
| download | linux-595aac488b546c7185be7e29c8ae165a588b2a9f.tar.xz linux-595aac488b546c7185be7e29c8ae165a588b2a9f.zip | |
sched: Introduce a function to update the idle statistics
Currently, two places update the idle statistics (and more to
come later in this series).
This patch creates a helper function for updating these
statistics.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: davej@redhat.com
LKML-Reference: <20100509082245.163e67ed@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/tick-sched.c | 29 |
1 files changed, 19 insertions, 10 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 358822ee32d5..59d8762c7e1d 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -150,14 +150,25 @@ static void tick_nohz_update_jiffies(ktime_t now) touch_softlockup_watchdog(); } -static void tick_nohz_stop_idle(int cpu, ktime_t now) +/* + * Updates the per cpu time idle statistics counters + */ +static void update_ts_time_stats(struct tick_sched *ts, ktime_t now) { - struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu); ktime_t delta; - delta = ktime_sub(now, ts->idle_entrytime); ts->idle_lastupdate = now; - ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta); + if (ts->idle_active) { + delta = ktime_sub(now, ts->idle_entrytime); + ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta); + } +} + +static void tick_nohz_stop_idle(int cpu, ktime_t now) +{ + struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu); + + update_ts_time_stats(ts, now); ts->idle_active = 0; sched_clock_idle_wakeup_event(0); @@ -165,14 +176,12 @@ static void tick_nohz_stop_idle(int cpu, ktime_t now) static ktime_t tick_nohz_start_idle(struct tick_sched *ts) { - ktime_t now, delta; + ktime_t now; now = ktime_get(); - if (ts->idle_active) { - delta = ktime_sub(now, ts->idle_entrytime); - ts->idle_lastupdate = now; - ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta); - } + + update_ts_time_stats(ts, now); + ts->idle_entrytime = now; ts->idle_active = 1; sched_clock_idle_sleep_event(); |