linux-kernel - Re: [PATCH] vfs: use RCU in ilookup

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Message-ID: <CAGudoHFBjfSkan10A-9Lx5koUs2rNsV5bWvprJTzxEaOjkETCA@mail.gmail.com>
Date: Mon, 15 Jul 2024 10:05:54 +0200
From: Mateusz Guzik <mjguzik@...il.com>
To: Bharata B Rao <bharata@....com>
Cc: brauner@...nel.org, viro@...iv.linux.org.uk, jack@...e.cz, 
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] vfs: use RCU in ilookup

On Mon, Jul 15, 2024 at 10:02 AM Bharata B Rao <bharata@....com> wrote:
>
> On 15-Jul-24 12:43 PM, Mateusz Guzik wrote:
> > A soft lockup in ilookup was reported when stress-testing a 512-way
> > system [1] (see [2] for full context) and it was verified that not
> > taking the lock shifts issues back to mm.
> >
> > [1] https://lore.kernel.org/linux-mm/56865e57-c250-44da-9713-cf1404595bcc@amd.com/
>
> Mateusz,
>
> Just want to mention explicitly that in addition to the lockless lookup
> changes that you suggested in [1], the test run also included your other
> commit
> https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git/commit/?h=vfs.inode.rcu&id=7180f8d91fcbf252de572d9ffacc945effed0060
> as you had suggested.
>

That commit is needed to have this compile to begin with, so it was
kind of implied. :)

-- 
Mateusz Guzik <mjguzik gmail.com>