Re: [PATCH] x86: Don't send RESCHEDULE_VECTOR to offlined cpus

[Gregory Haskins]

Gautham R Shenoy wrote:
> On Mon, Mar 10, 2008 at 01:24:18PM +0100, Ingo Molnar wrote:
> > * Gautham R Shenoy <ego@xxxxxxxxxx> wrote:
> >
> > > x86: Don't send RESCHEDULE_VECTOR to offlined cpus.
> > > From: Gautham R Shenoy <ego@xxxxxxxxxx>
> > >
> > > In the x86 native_smp_send_reschedule_function(), don't send the IPI 
> > > if the cpu has gone offline already. Warn nevertheless!!
> > have you seen this happen?
>
> Yup, this afternoon while running
> cpu-hotplug stress tests (http://lkml.org/lkml/2008/3/3/11)
> in parallel with kern-bench, I got this on the serial console.

Note that this may be a side-effect of the bug we are chasing with the 
rd->online problem.

E.g. if the rd->online issue is causing us to route tasks to dead CPUs, 
this phenomenon would probably go away once rd->online is fixed (which I 
believe it is with the patches that were submitted).

Regards,
-Greg
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