linux-kernel - Re: [PATCH 5.4 0/1] mm: allow a controlled amount of unfairness in the page lock

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Message-ID: <2023082742-mourner-amaze-7ff9@gregkh>
Date:   Sun, 27 Aug 2023 10:52:52 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Saeed Mirzamohammadi <saeed.mirzamohammadi@...cle.com>
Cc:     "# v4 . 16+" <stable@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 5.4 0/1] mm: allow a controlled amount of unfairness in
 the page lock

On Tue, Aug 22, 2023 at 05:20:50PM +0000, Saeed Mirzamohammadi wrote:
> 
> 
> > On Aug 22, 2023, at 12:08 AM, Greg KH <gregkh@...uxfoundation.org> wrote:
> > 
> > On Mon, Aug 21, 2023 at 03:25:45PM -0700, Saeed Mirzamohammadi wrote:
> >> We observed a 35% of regression running phoronix pts/ramspeed and also 16%
> >> with unixbench. Regression is caused by the following commit:
> >> dd0f194cfeb5 | mm: rewrite wait_on_page_bit_common() logic
> > 
> > That is not a valid git id in Linus's or in the linux-stable repo that I
> > can see.  Are you sure that it is correct?
> 
> Sorry for the incorrect sha. Here are the correct ones:
> 
>   kernel_dot_org/linux-stable.git    linux-5.4.y            - c32ab1c1959a
>   kernel_dot_org/torvalds_linux.git  master                 - 2a9127fcf229
>   kernel_dot_org/linux-stable.git    master                 - 2a9127fcf229
> ---
>   subject          : mm: rewrite wait_on_page_bit_common() logic
>   author           : torvalds@...ux-foundation.org
>   author date      : 2020-07-23 17:16:49

Thanks, now queued up.

greg k-h