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Re: [Qemu-block] [Qemu-devel] [PATCH 4/6] dirty-bitmaps: clean-up bitmap

From: John Snow
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH 4/6] dirty-bitmaps: clean-up bitmaps loading and migration logic
Date: Wed, 1 Aug 2018 13:34:03 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 08/01/2018 06:20 AM, Dr. David Alan Gilbert wrote:
> * John Snow (address@hidden) wrote:
> <snip>
>> I'd rather do something like this:
>> - Always flush bitmaps to disk on inactivate.
> Does that increase the time taken by the inactivate measurably?
> If it's small relative to everything else that's fine; it's just I
> always worry a little since I think this happens after we've stopped the
> CPU on the source, so is part of the 'downtime'.
> Dave
> --
> Dr. David Alan Gilbert / address@hidden / Manchester, UK

I'm worried that if we don't, we're leaving behind unusable, partially
complete files behind us. That's a bad design and we shouldn't push for
it just because it's theoretically faster.


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