Re: 2.6.27.8 scheduler bug - threads not being scheduled for long periods

[Dimitri Sivanich]

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.
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