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From: Wen Congyang <wency@cn.fujitsu.com>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Eric Blake <eblake@redhat.com>,
	HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>,
	Dave Anderson <anderson@redhat.com>,
	qemu-devel <qemu-devel@nongnu.org>,
	Luiz Capitulino <lcapitulino@redhat.com>
Subject: Re: [Qemu-devel] [RFC][PATCH 10/16 v6] run dump at the background
Date: Wed, 15 Feb 2012 11:47:20 +0800	[thread overview]
Message-ID: <4F3B2AC8.5030702@cn.fujitsu.com> (raw)
In-Reply-To: <4F3AA796.90900@siemens.com>

At 02/15/2012 02:27 AM, Jan Kiszka Wrote:
> On 2012-02-14 19:05, Jan Kiszka wrote:
>> On 2012-02-09 04:28, Wen Congyang wrote:
>>> The new monitor command dump may take long time to finish. So we need run it
>>> at the background.
>>
>> How does it work? Like live migration, i.e. you retransmit (overwrite)
>> already written but then dirtied pages? Hmm... no.
>>
>> What does background mean then? What is the use case? What if the user
>> decides to resume the vm?
> 
> OK, that is addressed in patch 15! I would suggest merging it into this
> patch. It makes sense to handle that case gracefully right from the
> beginning.

OK, I will merge it.

> 
> OK, now I have some other question: What is the point of rate-limiting
> the dump? The guest is not running, thus not competing for bandwidth.

I use bandwidth to try to control the writing speed. If we write the vmcore
to disk in a high speed, it may affect some other appilications which use
the same disk too.

Thanks
Wen Congyang

> 
> Jan
> 

  reply	other threads:[~2012-02-15  3:44 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-09  3:16 [Qemu-devel] [RFC][PATCH 00/16 v6] introducing a new, dedicated memory dump mechanism Wen Congyang
2012-02-09  3:19 ` [Qemu-devel] [RFC][PATCH 01/16 v6] monitor: introduce qemu_suspend_monitor()/qemu_resume_monitor() Wen Congyang
2012-02-14 16:19   ` Jan Kiszka
2012-02-15  2:54     ` Wen Congyang
2012-02-15  8:51       ` Jan Kiszka
2012-02-15 13:01         ` Luiz Capitulino
2012-02-16  1:35           ` Wen Congyang
2012-02-09  3:20 ` [Qemu-devel] [RFC][PATCH 02/16 v6] Add API to create memory mapping list Wen Congyang
2012-02-14 16:39   ` Jan Kiszka
2012-02-15  3:00     ` Wen Congyang
2012-02-09  3:21 ` [Qemu-devel] [RFC][PATCH 03/16 v6] Add API to check whether a physical address is I/O address Wen Congyang
2012-02-14 16:52   ` Jan Kiszka
2012-02-15  3:03     ` Wen Congyang
2012-02-09  3:21 ` [Qemu-devel] [RFC][PATCH 04/16 v6] target-i386: implement cpu_get_memory_mapping() Wen Congyang
2012-02-14 17:07   ` Jan Kiszka
2012-02-15  3:05     ` Wen Congyang
2012-02-09  3:22 ` [Qemu-devel] [RFC][PATCH 05/16 v6] Add API to get memory mapping Wen Congyang
2012-02-14 17:21   ` Jan Kiszka
2012-02-15  4:07     ` Wen Congyang
2012-02-15  9:17       ` Jan Kiszka
2012-02-15  9:41         ` Wen Congyang
2012-02-15  9:47           ` HATAYAMA Daisuke
2012-02-15 10:19             ` Jan Kiszka
2012-02-09  3:24 ` [Qemu-devel] [RFC][PATCH 06/16 v6] target-i386: Add API to write elf notes to core file Wen Congyang
2012-02-14 17:31   ` Jan Kiszka
2012-02-15  3:16     ` Wen Congyang
2012-02-09  3:24 ` [Qemu-devel] [RFC][PATCH 07/16 v6] target-i386: Add API to add extra memory mapping Wen Congyang
2012-02-14 17:35   ` Jan Kiszka
2012-02-15  5:19     ` Wen Congyang
2012-02-15  9:21       ` Jan Kiszka
2012-02-15  9:44         ` Wen Congyang
2012-02-15 10:21           ` Jan Kiszka
2012-02-17  9:32             ` Wen Congyang
2012-02-17 11:34               ` HATAYAMA Daisuke
2012-02-09  3:26 ` [Qemu-devel] [RFC][PATCH 08/16 v6] target-i386: add API to get dump info Wen Congyang
2012-02-14 17:39   ` Jan Kiszka
2012-02-15  3:30     ` Wen Congyang
2012-02-15  9:05       ` Jan Kiszka
2012-02-15  9:10         ` Wen Congyang
2012-02-15  9:12   ` Peter Maydell
2012-02-15  9:19     ` Wen Congyang
2012-02-09  3:28 ` [Qemu-devel] [RFC][PATCH 09/16 v6] introduce a new monitor command 'dump' to dump guest's memory Wen Congyang
2012-02-14 17:59   ` Jan Kiszka
2012-02-15  3:44     ` Wen Congyang
2012-02-17  8:52     ` Wen Congyang
2012-02-17  9:26       ` Jan Kiszka
2012-02-17  9:35         ` Wen Congyang
2012-02-17  9:35           ` Jan Kiszka
2012-02-17 16:32       ` Eric Blake
2012-02-17 16:51         ` Jan Kiszka
2012-02-17 17:05           ` Eric Blake
2012-02-09  3:28 ` [Qemu-devel] [RFC][PATCH 10/16 v6] run dump at the background Wen Congyang
2012-02-14 18:05   ` Jan Kiszka
2012-02-14 18:27     ` Jan Kiszka
2012-02-15  3:47       ` Wen Congyang [this message]
2012-02-15  9:07         ` Jan Kiszka
2012-02-15  9:22           ` Wen Congyang
2012-02-15  9:21             ` Jan Kiszka
2012-02-15  9:35               ` Wen Congyang
2012-02-15 10:16                 ` Jan Kiszka
2012-02-09  3:29 ` [Qemu-devel] [RFC][PATCH 11/16 v6] support detached dump Wen Congyang
2012-02-09  3:30 ` [Qemu-devel] [RFC][PATCH 12/16 v6] support to cancel the current dumping Wen Congyang
2012-02-09  3:32 ` [Qemu-devel] [RFC][PATCH 13/16 v6] support to set dumping speed Wen Congyang
2012-02-09  3:32 ` [Qemu-devel] [RFC][PATCH 14/16 v6] support to query dumping status Wen Congyang
2012-02-09  3:33 ` [Qemu-devel] [RFC][PATCH 15/16 v6] auto cancel dumping after vm state is changed to run Wen Congyang
2012-02-09  3:34 ` [Qemu-devel] [RFC][PATCH 16/16 v6] allow user to dump a fraction of the memory Wen Congyang
2012-02-14 18:27   ` Jan Kiszka
2012-02-13  1:45 ` [Qemu-devel] [RFC][PATCH 00/16 v6] introducing a new, dedicated memory dump mechanism Wen Congyang

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