Re: 2.6.27.8 scheduler bug - threads not being scheduled for longperiods

[Peter Zijlstra]

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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