linux-kernel - Re: [RFC PATCH] vhost-blk: An in-kernel accelerator for virtio-blk

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Message-ID: <4E32974B.6060605@gmail.com>
Date:	Fri, 29 Jul 2011 19:19:39 +0800
From:	Liu Yuan <namei.unix@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	"Michael S. Tsirkin" <mst@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Avi Kivity <avi@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] vhost-blk: An in-kernel accelerator for virtio-blk

On 07/28/2011 10:47 PM, Christoph Hellwig wrote:
> On Thu, Jul 28, 2011 at 10:29:05PM +0800, Liu Yuan wrote:
>> From: Liu Yuan<tailai.ly@...bao.com>
>>
>> Vhost-blk driver is an in-kernel accelerator, intercepting the
>> IO requests from KVM virtio-capable guests. It is based on the
>> vhost infrastructure.
>>
>> This is supposed to be a module over latest kernel tree, but it
>> needs some symbols from fs/aio.c and fs/eventfd.c to compile with.
>> So currently, after applying the patch, you need to *recomplie*
>> the kernel.
>>
>> Usage:
>> $kernel-src: make M=drivers/vhost
>> $kernel-src: sudo insmod drivers/vhost/vhost_blk.ko
>>
>> After insmod, you'll see /dev/vhost-blk created. done!
> You'll need to send the changes for existing code separately.
>
Thanks for reminding.

> If you're going mostly for raw blockdevice access just calling
> submit_bio will shave even more overhead off, and simplify the
> code a lot.
Yes, sounds cool, I'll give it a try.

Yuan
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