linux-kernel - Re: [LKP] Re: [fget] 054aa8d439: will-it-scale.per_thread

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Date:   Mon, 13 Dec 2021 11:44:31 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Carel Si <beibei.si@...el.com>
Cc:     Jann Horn <jannh@...gle.com>, Miklos Szeredi <mszeredi@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        kernel test robot <lkp@...el.com>, fengwei.yin@...el.com,
        stable <stable@...r.kernel.org>
Subject: Re: [LKP] Re: [fget] 054aa8d439: will-it-scale.per_thread_ops -5.7% regression

On Mon, Dec 13, 2021 at 10:37 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> So I'll just apply the patch. Thanks for the report and the testing

Done, it's commit e386dfc56f83 ("fget: clarify and improve
__fget_files() implementation") in my tree now.

I didn't mark it as "Fixes:" or for stable, because I can't imagine
that it matters in real life.

But then it  struck me that Greg has mentioned that he ends up getting
a lot of performance regression reports for people testing stable and
they can be distracting.

So I'm adding a stable cc here just so people are aware of this as a
"yeah, will-it-scale.poll2 performance regression has been reported,
has a fix available if somebody cares".

              Linus