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Re: [Qemu-devel] Debugging Migration
From: |
John Snow |
Subject: |
Re: [Qemu-devel] Debugging Migration |
Date: |
Tue, 6 Oct 2015 19:02:51 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 |
On 10/06/2015 06:40 PM, Denis V. Lunev wrote:
> On 10/06/2015 09:46 PM, John Snow wrote:
>> Is there a convenient way of "pausing" or stalling a live migration to
>> allow methodical testing of race conditions?
>>
>> I'd like to instrument something along the lines of:
>>
>> (1) Live migration begins.
>> (2) migration is artificially halted or paused, but QEMU is allowed to
>> run.
>> (3) Some additional qtest/QMP commands are received and processed.
>> (4) migration is allowed to resume.
>>
>> Does anyone have perhaps even test patches to instrument this sort of
>> thing, or is it up to detective john to add it if he wants it?
>>
>> Thanks,
>> --js
>>
> we have performed some experiments with migration "test mode".
> The idea was to estimate the time to migrate and estimate
> expected downtime for distributed resource management.
> In this mode the migration was not performed but all stuff around
> like dirty bitmap was touched.
>
> There are several patches for this in my queue but they are very
> hackish.
>
> Will it help you?
>
> Den
It certainly won't hurt me to look at them if you'll share :)
--js
- [Qemu-devel] Debugging Migration, John Snow, 2015/10/08
- Re: [Qemu-devel] Debugging Migration, Dr. David Alan Gilbert, 2015/10/08
- Re: [Qemu-devel] Debugging Migration, Denis V. Lunev, 2015/10/08
- Re: [Qemu-devel] Debugging Migration,
John Snow <=
- Re: [Qemu-devel] Debugging Migration, Denis V. Lunev, 2015/10/08
- [Qemu-devel] [RFC 0/8] QEMUFile-way to gather VM's memory statistics, Denis V. Lunev, 2015/10/08
- [Qemu-devel] [PATCH 3/8] migration: add new capability test-only, Denis V. Lunev, 2015/10/08
- Re: [Qemu-devel] [PATCH 3/8] migration: add new capability test-only, Eric Blake, 2015/10/08
- Re: [Qemu-devel] [PATCH 3/8] migration: add new capability test-only, Denis V. Lunev, 2015/10/09
- Re: [Qemu-devel] [PATCH 3/8] migration: add new capability test-only, Dr. David Alan Gilbert, 2015/10/09
- [Qemu-devel] [PATCH 7/8] migration: new migration test mode, Denis V. Lunev, 2015/10/08
- Re: [Qemu-devel] [PATCH 7/8] migration: new migration test mode, Dr. David Alan Gilbert, 2015/10/08
- Re: [Qemu-devel] [PATCH 7/8] migration: new migration test mode, Eric Blake, 2015/10/08
- Re: [Qemu-devel] [PATCH 7/8] migration: new migration test mode, Denis V. Lunev, 2015/10/09