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Re: [PATCH v3 04/10] hbitmap: drop meta bitmaps as they are unused
From: |
Max Reitz |
Subject: |
Re: [PATCH v3 04/10] hbitmap: drop meta bitmaps as they are unused |
Date: |
Mon, 20 Jan 2020 18:05:46 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.1 |
On 20.01.20 17:20, Vladimir Sementsov-Ogievskiy wrote:
> 20.01.2020 14:13, Max Reitz wrote:
>> On 19.12.19 11:03, Vladimir Sementsov-Ogievskiy wrote:
>>> Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
>>> ---
>>> include/qemu/hbitmap.h | 21 --------
>>> tests/test-hbitmap.c | 115 -----------------------------------------
>>> util/hbitmap.c | 16 ------
>>> 3 files changed, 152 deletions(-)
>>
>> Er, hrm, well.
>>
>> Reviewed-by: Max Reitz <address@hidden>
>>
>> git log me the only commits that touched anything to the regard of
>> '*create_meta*' were the ones that introduced it and your commit that
>> dropped it.
>>
>> Soo, er, well, okay. Why did we introduce these again? (I suppose I
>> should know since they have my S-o-b on them. But I actually don’t.)
>>
>> Max
>>
>
> I'm a bit not follow what you mean. I can just note, that dirty-bitmap.c
> part of meta bitmaps was recently removed, and hbitmap.c part I forgot to
> remove...
Yes, but who used that dirty-bitmap.c interface? As far as I can tell,
nobody.
> Meta bitmaps were intended to control live migration of bitmaps and to
> implement something like partial sync of bitmaps (write to qcow2 only
> changed part of bitmap), but migration implemented in other way
> (postcopy) and the second thing was not implemented.
OK. I was wondering why they were implemented without ever having been
used (as far as I can tell).
Max
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