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Re: [Qemu-devel] [PATCH 1/1] hmp: acquire aio_context in hmp_qemu_io

From: Kevin Wolf
Subject: Re: [Qemu-devel] [PATCH 1/1] hmp: acquire aio_context in hmp_qemu_io
Date: Tue, 14 Jun 2016 10:44:58 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

Am 14.06.2016 um 10:34 hat Denis V. Lunev geschrieben:
> On 06/08/2016 02:23 PM, Kevin Wolf wrote:
> >Am 08.06.2016 um 11:39 hat Denis V. Lunev geschrieben:
> >>From: Vladimir Sementsov-Ogievskiy <address@hidden>
> >>
> >>Acquire aio context before run command, this is mandatory for unit tests.
> >>
> >>Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
> >>Signed-off-by: Denis V. Lunev <address@hidden>
> >>CC: Kevin Wolf <address@hidden>
> >>CC: Paolo Bonzini <address@hidden>
> >Looks right to me, but why "mandatory for unit tests"? Does this fix an
> >observable bug in unit tests? If so, we should be more specific in the
> >commit message.
> >
> >But in fact, I would only expect it to make a difference for dataplane
> >and I don't think we have test cases that use both the 'qemu-io' HMP
> >command and dataplane.
> >
> >Kevin
> the problem is that it is usually difficult to understand that
> the problem is in locking and find where the locking is missed.
> Here we do have a place, which is used by unit testing, with
> a locking missed.
> May be now tests are not failing, but IMHO these tests MUST
> be fixed to accommodate future changes and thus this patch
> is mandatory for them.

I was never objecting to the patch, but just curious about the details
of a possible failure you were seeing because I didn't see how to hit
it in practice without dataplane.

Sorry for forgetting about the patch, I've applied it now.


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