From: Christoph Hellwig <hch@lst.de>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Avi Kivity <avi@redhat.com>, Christoph Hellwig <hch@lst.de>,
Rusty Russell <rusty@rustcorp.com.au>,
kvm@vger.kernel.org
Subject: Re: [PATCH, RFC] virtio_blk: add cache flush command
Date: Mon, 18 May 2009 14:03:36 +0200 [thread overview]
Message-ID: <20090518120336.GB11112@lst.de> (raw)
In-Reply-To: <4A086E72.5060302@codemonkey.ws>
On Mon, May 11, 2009 at 01:29:06PM -0500, Anthony Liguori wrote:
> >It don't think we realistically can.
>
> Maybe two fds? One open in O_SYNC and one not. Is such a thing sane?
O_SYNC and O_DIRECT currently behave exactly in the same way. In none
of the filesystem I've looked at there is an explicit cache flush,
but all send down a barrier which gives you an implicit cache flush
with the way barriers are implemented.
next prev parent reply other threads:[~2009-05-18 12:04 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-11 8:39 [PATCH, RFC] virtio_blk: add cache flush command Christoph Hellwig
2009-05-11 14:51 ` Anthony Liguori
2009-05-11 15:40 ` Christoph Hellwig
2009-05-11 15:45 ` Avi Kivity
2009-05-11 16:28 ` Christoph Hellwig
2009-05-11 16:49 ` Avi Kivity
2009-05-11 17:47 ` Anthony Liguori
2009-05-11 18:00 ` Avi Kivity
2009-05-11 18:29 ` Anthony Liguori
2009-05-11 18:40 ` Avi Kivity
2009-05-18 12:03 ` Christoph Hellwig [this message]
2009-05-12 7:23 ` Christoph Hellwig
2009-05-12 7:19 ` Christoph Hellwig
2009-05-12 8:35 ` Avi Kivity
2009-05-18 12:06 ` Christoph Hellwig
2009-05-11 16:38 ` Anthony Liguori
2009-05-12 7:26 ` Christoph Hellwig
2009-05-12 13:54 ` Rusty Russell
2009-05-12 14:18 ` Christian Borntraeger
2009-05-13 1:52 ` Rusty Russell
2009-05-18 12:07 ` Christoph Hellwig
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