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Re: [Qemu-devel] [PATCH v2 06/22] block: Add "supports_stats" field to B


From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PATCH v2 06/22] block: Add "supports_stats" field to BlockStats
Date: Tue, 13 Oct 2015 16:38:30 +0100
User-agent: Mutt/1.5.24 (2015-08-30)

On Fri, Oct 02, 2015 at 05:26:16PM +0300, Alberto Garcia wrote:
> query-blockstats always returns a BlockDeviceStats structure for each
> BDS, regardless of whether it implements accounting or not. Since the
> field is mandatory there's no way to tell that from the values alone.
> 
> This field solves that problem by indicating which BDSs support I/O
> accounting.

I'm not sure I understand the problem.

If I/O accounting isn't being used then all fields will be 0?



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