* Igor Mammedov <imamm...@redhat.com> wrote:
> On Thu, 6 Mar 2014 08:08:32 +0100
> Ingo Molnar <mi...@kernel.org> wrote:
>
> >
> > * Igor Mammedov <imamm...@redhat.com> wrote:
> >
> > > Master CPU may timeout before cpu_callin_mask is set and cancel
> > > booting CPU, but being onlined CPU still continues to boot, sets
> > > cpu_active_mask (CPU_STARTING notifiers) and spins in
> > > check_tsc_sync_target() for master cpu to arrive. Following attempt
> > > to online another cpu hangs in stop_machine, initiated from here:
> >
> > The changelog needs to prominently contain a description of the
> > practical relevance of this patch: has the hang triggered on any
> > system and under what circumstances, and did the patch resolve the
> > hang, etc.?
>
> Hang is observed on virtual machines during CPU hotplug, especially
> in big guests with many CPUs. (It happens more often if host is
> over-committed).
>
> Similar patch is carried in RHEL6 since 2012 and it fixes issue
> there, when applied to upstream kernel it also fixes issue.
Okay, cool - please update the patch description with that and
resubmit.
Thanks,
Ingo
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