diff options
author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-09-01 10:44:23 -0400 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2008-09-05 12:14:08 -0400 |
commit | 56c7426b3951e4f35a71d695f1c982989399d6fd (patch) | |
tree | 26001a24308baceab1ff36eb8ab1ed43fb831a4f /kernel/time/tick-sched.c | |
parent | b380b0d4f7dffcc235c0facefa537d4655619101 (diff) |
sched_clock: fix NOHZ interaction
If HLT stops the TSC, we'll fail to account idle time, thereby inflating the
actual process times. Fix this by re-calibrating the clock against GTOD when
leaving nohz mode.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Tested-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/time/tick-sched.c')
-rw-r--r-- | kernel/time/tick-sched.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 7a46bde78c6..a87b0468568 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c | |||
@@ -162,6 +162,8 @@ void tick_nohz_stop_idle(int cpu) | |||
162 | ts->idle_lastupdate = now; | 162 | ts->idle_lastupdate = now; |
163 | ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta); | 163 | ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta); |
164 | ts->idle_active = 0; | 164 | ts->idle_active = 0; |
165 | |||
166 | sched_clock_idle_wakeup_event(0); | ||
165 | } | 167 | } |
166 | } | 168 | } |
167 | 169 | ||
@@ -177,6 +179,7 @@ static ktime_t tick_nohz_start_idle(struct tick_sched *ts) | |||
177 | } | 179 | } |
178 | ts->idle_entrytime = now; | 180 | ts->idle_entrytime = now; |
179 | ts->idle_active = 1; | 181 | ts->idle_active = 1; |
182 | sched_clock_idle_sleep_event(); | ||
180 | return now; | 183 | return now; |
181 | } | 184 | } |
182 | 185 | ||