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Re: [Qemu-devel] [RFC PATCH v2 10/12] mc: expose tunable parameter for c
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From: |
Eric Blake |
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Subject: |
Re: [Qemu-devel] [RFC PATCH v2 10/12] mc: expose tunable parameter for checkpointing frequency |
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Date: |
Fri, 04 Apr 2014 10:35:50 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 |
On 04/04/2014 10:28 AM, Dr. David Alan Gilbert wrote:
> One thing to be a little careful about if we merge these tunables
> together, is what tunables are allowed to be changed while the migration
> is running. The 'capabilities' are currently fixed once the migration
> starts, but I know at least some of the tuneables people want to change
> while things are going - and some care is needed with it since (as we
> found with the xbzrle cache size) we get fun due to the use being in
> a different thread.
Possible to solve that by adding an annotation in extended query output
of which tunables are live, and by making the set command reject any
changes for a tunable that is not live if migration is already underway.
But yes, worth thinking about.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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