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: <D13FD910-FB1B-4DD8-9FFC-1BAF2C1390BF@oracle.com>
Date:   Tue, 22 Aug 2023 17:20:50 +0000
From:   Saeed Mirzamohammadi <saeed.mirzamohammadi@...cle.com>
To:     Greg KH <gregkh@...uxfoundation.org>
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 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,
Saeed

> 
> thanks,
> 
> greg k-h