From: Stefan Hajnoczi <stefanha@gmail.com>
To: Wu Libin <gnlwlb@163.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Data classification in Qemu
Date: Wed, 17 Sep 2014 10:01:50 +0100 [thread overview]
Message-ID: <20140917090150.GA10699@stefanha-thinkpad.redhat.com> (raw)
In-Reply-To: <4483414C-AE50-4371-944D-AED207A61E2C@163.com>
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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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next prev parent reply other threads:[~2014-09-17 9:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-15 16:06 [Qemu-devel] Data classification in Qemu Wu Libin
2014-09-16 14:46 ` Stefan Hajnoczi
2014-09-16 15:03 ` Wu Libin
2014-09-17 9:01 ` Stefan Hajnoczi [this message]
2014-09-17 13:48 ` Wu Libin
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