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
