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Date:   Wed, 7 Sep 2022 15:02:26 +0200
From:   Jan Kara <>
To:     Stefan Wahren <>
Cc:     Jan Kara <>,,
        Thorsten Leemhuis <>,
        Ted Tso <>, Ojaswin Mujoo <>,
        Andreas Dilger <>
Subject: Re: [PATCH 0/5 v2] ext4: Fix performance regression with mballoc

On Wed 07-09-22 12:49:47, Jan Kara wrote:
> > Here the iostat as usual:
> > 
> >
> > 
> > There is just one thing, but not sure this if this comes from these patches.
> > If i call
> > 
> > cat /proc/fs/ext4/mmcblk1p2/mb_structs_summary
> > 
> > The kernel throw a NULL pointer derefence in
> > ext4_mb_seq_structs_summary_show
> Yeah, likely a bug in my last patch. I didn't test my changes to the sysfs
> interface. Thanks for testing this, I'll have a look.

Indeed the procfs interface update was buggy. Attached is a new version of
patch 5 to fixup the interface (and a couple of whitespace issues) in the
previous version. I will resend the full series but I'll wait some more
time whether there are not other comments.

Jan Kara <>

View attachment "0005-ext4-Use-buckets-for-cr-1-block-scan-instead-of-rbtr.patch" of type "text/x-patch" (18783 bytes)

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