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From: Liu Yuan <namei.unix@gmail.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>,
	Stefan Hajnoczi <stefanha@gmail.com>,
	qemu-devel@nongnu.org,
	MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
Subject: Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics
Date: Wed, 09 Jan 2013 20:16:21 +0800	[thread overview]
Message-ID: <50ED5F95.2060403@gmail.com> (raw)
In-Reply-To: <50ED5D64.4040600@gmail.com>

On 01/09/2013 08:07 PM, Liu Yuan wrote:
> and my proposal (adding another field to BlockDriverState to allow
> self-interpretation cache flag) can work well with current block layer:
> 
> Sheepdog driver behavior:
>    cache flags            WCE toggled and resulting behavior
>    writethrough           writethrough
>    writeback              writetrhough (writeback + flush)
> 
> We can see that the writeback behavior for Guest-WCE toggling is the
> same as expected. The difference is that if we set cache=writethrough,
> guest can't change it via WCE toggling.

I am wondering if above scheme can apply to the block layer, then
'cache=xxx' can act as a stronger control over WCE toggling. Then we
don't need extra field.

Thanks,
Yuan

  parent reply	other threads:[~2013-01-09 12:16 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-12-19 18:29 [Qemu-devel] [PATCH] sheepdog: implement direct write semantics Liu Yuan
2012-12-25  7:47 ` MORITA Kazutaka
2012-12-25  8:26   ` Liu Yuan
2012-12-25  8:45   ` Liu Yuan
2013-01-03 13:43     ` Liu Yuan
2013-01-04 16:38       ` Stefan Hajnoczi
2013-01-05  4:40         ` Liu Yuan
2013-01-05  5:29           ` Liu Yuan
2013-01-05  7:56             ` Liu Yuan
2013-01-07 12:31               ` Stefan Hajnoczi
2013-01-08  5:28                 ` Liu Yuan
2013-01-07 13:23               ` Kevin Wolf
2013-01-08  5:42                 ` Liu Yuan
2013-01-08  9:40                   ` Stefan Hajnoczi
2013-01-08  9:45                     ` Liu Yuan
2013-01-08 10:00                       ` Kevin Wolf
2013-01-08 10:39                         ` Liu Yuan
2013-01-08 10:51                           ` Kevin Wolf
2013-01-08 11:08                             ` Liu Yuan
2013-01-08 11:19                               ` Kevin Wolf
2013-01-08 11:35                                 ` Liu Yuan
2013-01-08 12:12                                   ` Kevin Wolf
2013-01-08 13:18                                     ` Liu Yuan
2013-01-08 13:23                                       ` Liu Yuan
2013-01-09 10:25                                       ` Paolo Bonzini
2013-01-09 10:36                                         ` Liu Yuan
2013-01-09 10:40                                           ` Paolo Bonzini
2013-01-09 10:46                                             ` Liu Yuan
2013-01-09 10:58                                               ` Liu Yuan
2013-01-09 11:10                                                 ` Paolo Bonzini
2013-01-09 12:07                                               ` Liu Yuan
2013-01-09 12:10                                                 ` Liu Yuan
2013-01-09 12:16                                                 ` Liu Yuan [this message]
2013-01-09 12:42                                                 ` Kevin Wolf
2013-01-09 13:04                                                   ` Liu Yuan
2013-01-09 15:10                                                     ` Paolo Bonzini
2013-01-10  5:38                                                       ` Liu Yuan
2013-01-11  7:52                                                         ` MORITA Kazutaka
2013-01-11  8:07                                                           ` Liu Yuan
2013-01-11  9:00                                                             ` Paolo Bonzini
2013-01-11  9:04                                                               ` Liu Yuan
2013-01-11  9:34                                                                 ` Paolo Bonzini
2013-01-11  9:38                                                                   ` Liu Yuan
2013-01-11  9:40                                                                     ` Paolo Bonzini
2013-01-11  9:32                                                           ` Kevin Wolf
2013-01-10 15:25                                                       ` Jamie Lokier
2013-01-10 15:31                                                         ` Paolo Bonzini
2013-01-10 17:22                                                           ` Jamie Lokier
2013-01-09 11:10                                           ` Kevin Wolf
2013-01-09 10:23                                     ` Paolo Bonzini
2013-01-10 15:12                             ` Jamie Lokier
2013-01-10 15:21                               ` Kevin Wolf
2013-01-10  8:03 ` [Qemu-devel] [PATCH v2] " Liu Yuan
2013-01-10  9:04   ` Stefan Hajnoczi
2013-01-11  7:35   ` MORITA Kazutaka
2013-01-11  9:23     ` Kevin Wolf

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