linux-kernel - Re: [PATCH 2/2] virtio-scsi: reset virtqueue affinity when doing cpu hotplug

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Message-ID: <51129282.7040100@redhat.com>
Date:	Wed, 06 Feb 2013 18:27:30 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	gaowanlong@...fujitsu.com
CC:	Rusty Russell <rusty@...tcorp.com.au>, kvm@...r.kernel.org,
	linux-scsi@...r.kernel.org, mst@...hat.com, hutao@...fujitsu.com,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, stefanha@...hat.com
Subject: Re: [PATCH 2/2] virtio-scsi: reset virtqueue affinity when doing
 cpu hotplug

Il 16/01/2013 04:55, Wanlong Gao ha scritto:
>>> >> Add hot cpu notifier to reset the request virtqueue affinity
>>> >> when doing cpu hotplug.
>> > 
>> > You need to be careful to get_online_cpus() and put_online_cpus() here,
>> > so CPUs can't go up and down in the middle of operations.
>> > 
>> > In particular, get_online_cpus()/put_online_cpus() around calls to
>> > virtscsi_set_affinity() (except within notifiers).
> Yes, I'll take care of this, thank you.
> 

I squashed patch 1 (plus changes to get/put_online_cpus) in my
multiqueue series, and applied this one as a separate patch.

Paolo
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