Re: [PATCH 2 of 2] Avoid vcpu migration of paused vcpus

[Keir Fraser <keir@xen.org>]

Your original patch didn't touch this code. Was that an omission in the
original version? On reflection I prefer your original patch to this new
approach. I'll apply it if you still believe your original patch is complete
and correct as it stands.

 -- Keir

On 22/03/2012 08:22, "Juergen Gross" <juergen.gross@ts.fujitsu.com> wrote:

> Currently offlining a cpu will migrate all vcpus which were active on that
> cpu to another one, possibly breaking existing cpu affinities.
> 
> In case of an ACPI state change the cpus are taken offline and online later
> (if not poweroff) while all domains are paused. There is no reason to
> migrate the vcpus during offlining the cpus, as the cpus will be available
> again when the domains are being unpaused.
> 
> This patch defers the migration check in case of paused vcpus or domains
> by adding vcpu_arouse() to wake up a vcpu and check whether it must be
> migrated to another cpu.
> 
> Signed-off-by: Juergen Gross <juergen.gross@ts.fujitsu.com>
> 
> 
> 3 files changed, 64 insertions(+), 24 deletions(-)
> xen/common/domain.c     |    4 +-
> xen/common/schedule.c   |   83 ++++++++++++++++++++++++++++++++++-------------
> xen/include/xen/sched.h |    1
> 
> 
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