From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Alexander Yarygin <yarygin@linux.vnet.ibm.com>, qemu-devel@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>,
qemu-block@nongnu.org,
Ekaterina Tumanova <tumanova@linux.vnet.ibm.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v2] block: Let bdrv_drain_all() to call aio_poll() for each AioContext
Date: Fri, 15 May 2015 09:00:27 +0200 [thread overview]
Message-ID: <5555998B.10509@de.ibm.com> (raw)
In-Reply-To: <5555995A.2070608@de.ibm.com>
Am 15.05.2015 um 08:59 schrieb Christian Borntraeger:
> PS: There is another independent issue now in the kernel when exiting QEMU
> caused by Linux kernel commit 6098b45b32e6baeacc04790773ced9340601d511
> Author: Gu Zheng <guz.fnst@cn.fujitsu.com>
> AuthorDate: Wed Sep 3 17:45:44 2014 +0800
> Commit: Benjamin LaHaise <bcrl@kvack.org>
> CommitDate: Thu Sep 4 16:54:47 2014 -0400
>
> aio: block exit_aio() until all context requests are completed
>
> A QEMU with 1000 devices will sleep a long time in exit_aio with now obvious
> sign of activity as zombie process. I will take care of that....
>
> Christian
To make it clear. This kernel wait time happens with and without Alexanders patch.
next prev parent reply other threads:[~2015-05-15 7:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-14 16:03 [Qemu-devel] [PATCH v2] block: Let bdrv_drain_all() to call aio_poll() for each AioContext Alexander Yarygin
2015-05-15 2:04 ` Fam Zheng
2015-05-15 6:59 ` Christian Borntraeger
2015-05-15 7:00 ` Christian Borntraeger [this message]
2015-05-15 8:16 ` Christian Borntraeger
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