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Date:   Thu, 22 Sep 2022 11:15:42 +0200
From:   Jan Kara <>
To:     Theodore Ts'o <>
Subject: Re: [PATCH 1/5] ext4: Make mballoc try target group first even with

On Wed 21-09-22 22:52:34, Theodore Ts'o wrote:
> On Thu, 8 Sep 2022 11:21:24 +0200, Jan Kara wrote:
> > One of the side-effects of mb_optimize_scan was that the optimized
> > functions to select next group to try were called even before we tried
> > the goal group. As a result we no longer allocate files close to
> > corresponding inodes as well as we don't try to expand currently
> > allocated extent in the same group. This results in reaim regression
> > with workfile.disk workload of upto 8% with many clients on my test
> > machine:
> > 
> > [...]
> Applied, thanks!
> [1/5] ext4: Make mballoc try target group first even with mb_optimize_scan
>       commit: 4fca50d440cc5d4dc570ad5484cc0b70b381bc2a
> [2/5] ext4: Avoid unnecessary spreading of allocations among groups
>       commit: 1940265ede6683f6317cba0d428ce6505eaca944
> [3/5] ext4: Make directory inode spreading reflect flexbg size
>       commit: 613c5a85898d1cd44e68f28d65eccf64a8ace9cf
> [4/5] ext4: Use locality group preallocation for small closed files
>       commit: a9f2a2931d0e197ab28c6007966053fdababd53f
> [5/5] ext4: Use buckets for cr 1 block scan instead of rbtree
>       commit: 83e80a6e3543f37f74c8e48a5f305b054b65ce2a

Thanks Ted! I just have locally a small fixup to the series that was reported
by Smatch. It is attached, either fold it into the last patch or just merge
it as a separate patch. Thanks!

Jan Kara <>

View attachment "0001-ext4-Fixup-possible-uninitialized-variable-access-in.patch" of type "text/x-patch" (1477 bytes)

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