On Thu, 2007-02-22 at 08:46 +0100, Ingo Molnar wrote:
> * Thomas Gleixner <[email protected]> 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 <[email protected]>
>
> > 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.
Yes, was introduced in 2.6.20 and definitely should hit the stable tree.
tglx
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