linux-ext4 - Re: [PATCH 0/3] ext4 fast commit API cleanup

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Date:   Wed, 22 Dec 2021 11:28:29 -0500
From:   Eric Whitney <enwlinux@...il.com>
To:     Harshad Shirwadkar <harshadshirwadkar@...il.com>
Cc:     linux-ext4@...r.kernel.org, yinxin.x@...edance.com,
        enwlinux@...il.com, Harshad Shirwadkar <harshads@...gle.com>
Subject: Re: [PATCH 0/3] ext4 fast commit API cleanup

* Harshad Shirwadkar <harshadshirwadkar@...il.com>:
> ext4: fast commit API cleanup
> 
> This patch series fixes up fast commit APIs. There are NO on-disk
> format changes introduced in this series. The main contribution of the
> series is that it drops fast commit specific transaction APIs and
> makes fast commits work with journal transaction APIs of JBD2
> journalling system. With these changes, a fast commit eligible
> transaction is simply enclosed in calls to "jbd2_journal_start()" and
> "jbd2_journal_stop()". If the update that is being performed is fast
> commit ineligible, one must simply call ext4_fc_mark_ineligible()
> after starting a transaction using "jbd2_journal_start()". The last
> patch in the series simplifies fast commit stats recording by moving
> it to a different function.
> 
> I verified that the patch series introduces no regressions in "quick"
> and "log" groups when "fast_commit" feature is enabled.
> 
> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@...il.com>
> 
> Harshad Shirwadkar (3):
>   ext4: drop transaction start stop APIs for fast commit
>   ext4: drop ineligible txn start stop APIs
>   ext4: simplify updating of fast commit stats
> 
>  fs/ext4/acl.c         |   2 -
>  fs/ext4/ext4.h        |  12 +-
>  fs/ext4/extents.c     |   9 +-
>  fs/ext4/fast_commit.c | 250 ++++++++++++------------------------------
>  fs/ext4/fast_commit.h |  27 ++---
>  fs/ext4/file.c        |   4 -
>  fs/ext4/inode.c       |   7 +-
>  fs/ext4/ioctl.c       |  13 +--
>  fs/ext4/super.c       |   1 -
>  fs/jbd2/journal.c     |   2 +
>  10 files changed, 96 insertions(+), 231 deletions(-)
> 
> -- 
> 2.34.1.173.g76aa8bc2d0-goog
>

Hi Harshad:

I applied this patch series to 5.16-rc6, and then ran 500 trials of generic/083
using xfstests-bld's adv test case (where I'd consistently encountered kernel
hangs after 16 or 17 runs) without failures and a full -g auto run over all the
default test cases without regressions.

Thanks for the patches!

Tested-by: Eric Whitney <enwlinux@...il.com>

Eric