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Re: [Qemu-devel] [PATCH 0/2] vl: Drain before (block) job cancel when qu

From: Kevin Wolf
Subject: Re: [Qemu-devel] [PATCH 0/2] vl: Drain before (block) job cancel when quitting
Date: Fri, 19 Jul 2019 15:26:12 +0200
User-agent: Mutt/1.11.3 (2019-02-01)

Am 13.06.2019 um 00:08 hat Max Reitz geschrieben:
> Quitting qemu should lead to qemu exiting pretty much immediately.  That
> means if you have a block job running on a throttled block node, the
> node should ignore its throttling and the job should be cancelled
> immediately.
> Unfortunately, that is not what happens.  Currently, the node will be
> drained (with a bdrv_drain_all()), and then again unquiesced (because
> bdrv_drain_all() ends).  Then, the block job is cancelled; but at this
> point, the node is no longer drained, so it will block, as it befits a
> throttling node.
> To fix this issue, we have to keep all nodes drained while we cancel all
> block jobs when quitting qemu.  This will make the throttle node ignore
> its throttling and thus let the block job cancel immediately.

Thanks, applied to the block branch.


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