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Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics
From: |
Liu Yuan |
Subject: |
Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics |
Date: |
Wed, 09 Jan 2013 20:16:21 +0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0 |
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
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, (continued)
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/08
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/08
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Paolo Bonzini, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Paolo Bonzini, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Paolo Bonzini, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics,
Liu Yuan <=
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Kevin Wolf, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Paolo Bonzini, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/10
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, MORITA Kazutaka, 2013/01/11
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/11
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Paolo Bonzini, 2013/01/11
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/11
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Paolo Bonzini, 2013/01/11
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/11