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From: | Denis V. Lunev |
Subject: | Re: [Qemu-devel] Debugging Migration |
Date: | Wed, 7 Oct 2015 01:40:29 +0300 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
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
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