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>
