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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Mon, 13 Dec 2021 11:44:31 -0800
Message-ID: <CAHk-=whoMGTAAyah0jH+rHyAXCLnxAHu8KffrR8PrAXGhTxRdA@mail.gmail.com>
Subject: Re: [LKP] Re: [fget] 054aa8d439: will-it-scale.per_thread_ops -5.7% regression
To:     Carel Si <beibei.si@intel.com>
Cc:     Jann Horn <jannh@google.com>, Miklos Szeredi <mszeredi@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>, lkp@lists.01.org,
        kernel test robot <lkp@intel.com>, fengwei.yin@intel.com,
        stable <stable@vger.kernel.org>
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On Mon, Dec 13, 2021 at 10:37 AM Linus Torvalds
<torvalds@linux-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