linux-ext4 - Re: [PATCH] ext4: Increase IO priority of fastcommit.

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Message-ID: <175892300642.128029.8985774143396523898.b4-ty@mit.edu>
Date: Fri, 26 Sep 2025 17:47:44 -0400
From: "Theodore Ts'o" <tytso@....edu>
To: linux-ext4@...r.kernel.org, Julian Sun <sunjunchao@...edance.com>
Cc: "Theodore Ts'o" <tytso@....edu>, jack@...e.cz, harshadshirwadkar@...il.com,
        ritesh.list@...il.com
Subject: Re: [PATCH] ext4: Increase IO priority of fastcommit.


On Wed, 27 Aug 2025 20:18:12 +0800, Julian Sun wrote:
> The following code paths may result in high latency or even task hangs:
>    1. fastcommit io is throttled by wbt.
>    2. jbd2_fc_wait_bufs() might wait for a long time while
> JBD2_FAST_COMMIT_ONGOING is set in journal->flags, and then
> jbd2_journal_commit_transaction() waits for the
> JBD2_FAST_COMMIT_ONGOING bit for a long time while holding the write
> lock of j_state_lock.
>    3. start_this_handle() waits for read lock of j_state_lock which
> results in high latency or task hang.
> 
> [...]

Applied, thanks!

[1/1] ext4: Increase IO priority of fastcommit.
      commit: 46e75c56dfeafb6756773b71cabe187a6886859a

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