Messages in this thread |  | | | Subject | Re: 2.6.27.8 scheduler bug - threads not being scheduled for long periods | | From | Peter Zijlstra <> | | Date | Tue, 06 Jan 2009 08:36:26 +0100 | |
On Mon, 2009-01-05 at 17:02 -0600, Dimitri Sivanich wrote:
> Peter,
>
> On Mon, Jan 05, 2009 at 04:36:21PM -0600, Dimitri Sivanich wrote:
> > And sure enough, the rq->clock is sometimes going backwards.
> >
> > The comment for sched_clock() in arch/ia64/kernel/head.S:
> > * Return a CPU-local timestamp in nano-seconds. This timestamp is
> > * NOT synchronized across CPUs its return value must never be
> > * compared against the values returned on another CPU. The usage in
> > * kernel/sched.c ensures that.
> >
> > We will try this with CONFIG_HAVE_UNSTABLE_SCHED_CLOCKS.
> >
>
> The testcase does indeed run with CONFIG_HAVE_UNSTABLE_SCHED_CLOCKS configured.
Ok, glad it worked out, thanks!
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