Messages in this thread | | | Date | Thu, 22 Feb 2007 08:46:24 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH] Fix posix-cpu-timer breakage caused by stale p->last_ran value |
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* Thomas Gleixner <tglx@linutronix.de> wrote:
> The problem is that the p->last_ran value is not updated after a > context switch. So a subsequent call to current_sched_time() > calculates with a stale p->last_ran value, i.e. accounts the full > time, which the task was scheduled away. > > Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> sched_info_switch(prev, next); > if (likely(prev != next)) { > - next->timestamp = now; > + next->timestamp = next->last_ran = now;
ouch! nice catch. Also for v2.6.20.2 i think. 2.6.19 should be unaffected.
Acked-by: Ingo Molnar <mingo@elte.hu>
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