linux-kernel - Re: Writeback bug causing writeback stalls

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Message-ID: <CAB0TPYFuT7Gp=8qBCGBKa3O0=hkUMTZsmhn3VqZuoKYM4bZOSw@mail.gmail.com>
Date:   Fri, 29 May 2020 21:37:50 +0200
From:   Martijn Coenen <maco@...roid.com>
To:     Jan Kara <jack@...e.cz>
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Jens Axboe <axboe@...nel.dk>, miklos@...redi.hu, tj@...nel.org,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        kernel-team@...roid.com
Subject: Re: Writeback bug causing writeback stalls

Hi Jan,

On Fri, May 29, 2020 at 5:20 PM Jan Kara <jack@...e.cz> wrote:
> I understand. I have written a fix (attached). Currently its under testing
> together with other cleanups. If everything works fine, I plan to submit
> the patches on Monday.

Thanks a lot for the quick fix! I ran my usual way to reproduce the
problem, and did not see it, so that's good! I do observe write speed
dips - eg we usually sustain 180 MB/s on this device, but now it
regularly dips down to 10 MB/s, then jumps back up again. That might
be unrelated to your patch though, I will run more tests over the
weekend and report back!

Best,
Martijn

>
>                                                                 Honza
> --
> Jan Kara <jack@...e.com>
> SUSE Labs, CR