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Message-ID: <f88106b26a2b647a1541d049999d5546d2ee3e51.camel@kernel.org>
Date: Thu, 28 Sep 2023 08:01:50 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Amir Goldstein <amir73il@...il.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>,
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Subject: Re: [PATCH 87/87] fs: move i_blocks up a few places in struct inode
On Thu, 2023-09-28 at 14:35 +0300, Amir Goldstein wrote:
> On Thu, Sep 28, 2023 at 2:06 PM Jeff Layton <jlayton@...nel.org> wrote:
> >
> > The recent change to use discrete integers instead of struct timespec64
> > in struct inode shaved 8 bytes off of it, but it also moves the i_lock
> > into the previous cacheline, away from the fields that it protects.
> >
> > Move i_blocks up above the i_lock, which moves the new 4 byte hole to
> > just after the timestamps, without changing the size of the structure.
> >
>
> Instead of creating an implicit hole, can you please move i_generation
> to fill the 4 bytes hole.
>
> It makes sense in the same cache line with i_ino and I could
> use the vacant 4 bytes hole above i_fsnotify_mask to expand the
> mask to 64bit (the 32bit event mask space is running out).
>
> Thanks,
> Amir.
>
Sounds like a plan. Resulting struct inode size is the same (616 bytes
with my kdevops kconfig). BTW: all of these changes are in my "amtime"
branch if anyone wants to pull them down.
--
Jeff Layton <jlayton@...nel.org>
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