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

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Date:   Wed, 15 Dec 2021 13:54:33 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Carel Si <beibei.si@...el.com>, 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 11:44:31AM -0800, Linus Torvalds wrote:
> 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".

Thanks, I'll keep an eye on this.

greg k-h