Re: [PATCH 3/4] block/copy-before-write: reverse access bitmap

2025-05-21 Thread Andrey Zhadchenko
On 5/20/25 19:26, Eric Blake wrote: [?? ??? ? ?? ?? ebl...@redhat.com. ???, ?? ??? ?, ?? ?? https://aka.ms/LearnAboutSenderIdentification ] On Tue, May 13, 2025 at 03:32:37AM +0200, Andrey Zhadchenko wrote: HBitmaps allow us to search set bits pretty fast. On

Re: [PATCH 3/4] block/copy-before-write: reverse access bitmap

2025-05-20 Thread Eric Blake
On Tue, May 13, 2025 at 03:32:37AM +0200, Andrey Zhadchenko wrote: > HBitmaps allow us to search set bits pretty fast. On the contrary, > when searching zeroes, we may be forced to fully traverse the lower > level. > When we run blockdev-backup with mode=full on top of snapshot filter > + cbw filte