linux-ext4 - Re: [PATCH v3 00/17] ext4: better scalability for ext4 block allocation

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Message-ID: <175296153002.397842.8557190355040548244.b4-ty@mit.edu>
Date: Sat, 19 Jul 2025 17:45:53 -0400
From: "Theodore Ts'o" <tytso@....edu>
To: linux-ext4@...r.kernel.org, Baokun Li <libaokun1@...wei.com>
Cc: "Theodore Ts'o" <tytso@....edu>, adilger.kernel@...ger.ca, jack@...e.cz,
        linux-kernel@...r.kernel.org, ojaswin@...ux.ibm.com,
        julia.lawall@...ia.fr, yi.zhang@...wei.com, yangerkun@...wei.com,
        libaokun@...weicloud.com
Subject: Re: [PATCH v3 00/17] ext4: better scalability for ext4 block allocation


On Mon, 14 Jul 2025 21:03:10 +0800, Baokun Li wrote:
> Changes since v2:
>  * Collect RVB from Jan Kara. (Thanks for your review!)
>  * Add patch 2.
>  * Patch 4: Switching to READ_ONCE/WRITE_ONCE (great for single-process)
>         over smp_load_acquire/smp_store_release (only slight multi-process
>         gain). (Suggested by Jan Kara)
>  * Patch 5: The number of global goals is now set to the lesser of the CPU
>         count or one-fourth of the group count. This prevents setting too
>         many goals for small filesystems, which lead to file dispersion.
>         (Suggested by Jan Kara)
>  * Patch 5: Directly use kfree() to release s_mb_last_groups instead of
>         kvfree(). (Suggested by Julia Lawall)
>  * Patch 11: Even without mb_optimize_scan enabled, we now always attempt
>         to remove the group from the old order list.(Suggested by Jan Kara)
>  * Patch 14-16: Added comments for clarity, refined logic, and removed
>         obsolete variables.
>  * Update performance test results and indicate raw disk write bandwidth.
> 
> [...]

Applied, thanks!

[01/17] ext4: add ext4_try_lock_group() to skip busy groups
        commit: 68f9a4d4f74ac2f6b8a836600caedb17b1f417e0
[02/17] ext4: separate stream goal hits from s_bal_goals for better tracking
        commit: c6a98dbdff75a960a8976294a56b3366305b4fed
[03/17] ext4: remove unnecessary s_mb_last_start
        commit: 8eb252a81b311d6b2a59176c9ef7e17d731e17e6
[04/17] ext4: remove unnecessary s_md_lock on update s_mb_last_group
        commit: ea906991a494eeaf8b6a4ac82c568071a6b6b52c
[05/17] ext4: utilize multiple global goals to reduce contention
        commit: 174688d2e06ef9e03d5b93ce2386e2e9a5af6e7b
[06/17] ext4: get rid of some obsolete EXT4_MB_HINT flags
        commit: d82c95e546dc57b3cd2d46e38ac216cd08dfab3c
[07/17] ext4: fix typo in CR_GOAL_LEN_SLOW comment
        commit: 1930d818c5ecfd557eae0f581cc9b6392debf9c6
[08/17] ext4: convert sbi->s_mb_free_pending to atomic_t
        commit: 3772fe7b4225f21a1bfe63e4a338702cc3c153de
[09/17] ext4: merge freed extent with existing extents before insertion
        commit: 92ba7b95ef0743c76688fd3d4c644e8ba4fd4cc4
[10/17] ext4: fix zombie groups in average fragment size lists
        commit: 84521ebf83028c0321050b8665e05d5cdef5d0d8
[11/17] ext4: fix largest free orders lists corruption on mb_optimize_scan switch
        commit: bbe11dd13a3ff78ed256b8c66356624284c66f99
[12/17] ext4: factor out __ext4_mb_scan_group()
        commit: 47fb751bf947da35f6669ddf5ab9869f58f991e2
[13/17] ext4: factor out ext4_mb_might_prefetch()
        commit: 12a5b877c314778ddf9a5c603eeb1803a514ab58
[14/17] ext4: factor out ext4_mb_scan_group()
        commit: 6e0275f6e713f55dd3fc23be317ec11f8db1766d
[15/17] ext4: convert free groups order lists to xarrays
        commit: bffe0d5051626a3e6ce4b03e247814af2d595ee2
[16/17] ext4: refactor choose group to scan group
        commit: 56b493f9ac002ee7963eed22eb4131d120d60fd3
[17/17] ext4: implement linear-like traversal across order xarrays
        commit: feffac547fb53d7a3fedd47a50fa91bd2d804d41

Best regards,
-- 
Theodore Ts'o <tytso@....edu>