Re: [PATCH v2] ext4: place buffer head allocation before handle start

[Theodore Ts'o]

On Sat, 3 Sep 2022 09:24:29 +0800, Jinke Han wrote:
> From: Jinke Han <hanjinke.666@xxxxxxxxxxxxx>
> 
> In our product environment, we encounter some jbd hung waiting handles to
> stop while several writters were doing memory reclaim for buffer head
> allocation in delay alloc write path. Ext4 do buffer head allocation with
> holding transaction handle which may be blocked too long if the reclaim
> works not so smooth. According to our bcc trace, the reclaim time in
> buffer head allocation can reach 258s and the jbd transaction commit also
> take almost the same time meanwhile. Except for these extreme cases,
> we often see several seconds delays for cgroup memory reclaim on our
> servers. This is more likely to happen considering docker environment.
> 
> [...]

Applied, thanks!

[1/1] ext4: place buffer head allocation before handle start
      commit: 843b6ee4b8d0d9e7507dad491920db1fbde12439

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