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Re: [Qemu-devel] Data classification in Qemu
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] Data classification in Qemu |
Date: |
Wed, 17 Sep 2014 10:01:50 +0100 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Tue, Sep 16, 2014 at 11:03:04PM +0800, Wu Libin wrote:
> Yeah, i know dm-cache, it’s in the layer of block.
>
> Maybe my description is not clear enough.Just because i see a patch, it will
> set flags which can classify IO size in bio->bi_flags, and in the function
> sd_prep_fn, it will set the SCSI command depends on the bio->bi_flags, like:
> SCpnt->cmnd[6] = DSS_BIO_CLASS(SCpnt->request->bio);
>
> And i see the data classification function will be enabled when the device
> model is “QEMU”, so i guess the QEMU must can recognise the SCSI command.
> That’s why i will search the data classification about the QEMU.
>
> It’s true QEMU not care about the filesystem, but we have flags, right, -:).
After a web search I guess you are are talking about this paper:
http://sigops.org/sosp/sosp11/current/2011-Cascais/printable/05-mesnier.pdf
The code isn't upstream and I've never heard of it.
I think you should get in touch with the authors instead.
Stefan
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