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SubjectRe: [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<>
>> 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.


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