Re: [PATCH 0/5 v3] ext4: Fix performance regression with mballoc

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Hi Jan,

Am 08.09.22 um 11:21 schrieb Jan Kara:
Hello,

Here is the third version of my mballoc improvements to avoid spreading
allocations with mb_optimize_scan=1. Since v2 there are only small changes and
fixes found during review and testing. Overall the series looks mostly ready to
go, I just didn't see any comments regarding patch 3 - a fix of metabg handling
in the Orlov allocator which is kind of independent, I've just found it when
reading the code. Also patch 5 needs final review after all the fixes.

Changes since v1:
- reworked data structure for CR 1 scan
- make small closed files use locality group preallocation
- fix metabg handling in the Orlov allocator

Changes since v2:
- whitespace fixes
- fix outdated comment
- fix handling of mb_structs_summary procfs file
- fix bad unlock on error recovery path

unfortunately the real patches doesn't have v3 which leads to confusion.

Just a note: in case this series cannot be applied for stable (5.15), we need a second solution to fix the regression there.




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