Re: [Qemu-devel] Data classification in Qemu

[Stefan Hajnoczi]

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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