From: Rusty Russell <rusty@rustcorp.com.au>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: kvm@vger.kernel.org, virtualization@lists.osdl.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
David Miller <davem@davemloft.net>
Subject: Re: [PATCH] vhost-net: switch to smp barriers
Date: Mon, 8 Feb 2010 18:49:39 +1030 [thread overview]
Message-ID: <201002081849.39512.rusty@rustcorp.com.au> (raw)
In-Reply-To: <20100207090749.GA12968@redhat.com>
On Sun, 7 Feb 2010 07:37:49 pm Michael S. Tsirkin wrote:
> On Mon, Feb 01, 2010 at 07:21:02PM +0200, Michael S. Tsirkin wrote:
> > vhost-net only uses memory barriers to control SMP effects
> > (communication with userspace potentially running on a different CPU),
> > so it should use SMP barriers and not mandatory barriers for memory
> > access ordering, as suggested by Documentation/memory-barriers.txt
> >
> > Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
>
>
> Rusty, any feedback on this one?
> Thanks!
Yep. barrier() is correct on UP to guard against preemption.
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Thanks,
Rusty.
next prev parent reply other threads:[~2010-02-08 8:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-01 17:21 [PATCH] vhost-net: switch to smp barriers Michael S. Tsirkin
2010-02-01 17:21 ` Michael S. Tsirkin
2010-02-01 17:21 ` Michael S. Tsirkin
2010-02-07 9:07 ` Michael S. Tsirkin
2010-02-08 8:19 ` Rusty Russell [this message]
2010-02-13 17:39 ` Michael S. Tsirkin
2010-02-14 19:55 ` David Miller
2010-02-07 9:42 ` Avi Kivity
2010-02-07 9:44 ` Michael S. Tsirkin
2010-02-07 9:56 ` Avi Kivity
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