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

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Message-ID: <20230821222547.483583-1-saeed.mirzamohammadi@oracle.com>
Date:   Mon, 21 Aug 2023 15:25:45 -0700
From:   Saeed Mirzamohammadi <saeed.mirzamohammadi@...cle.com>
To:     stable@...r.kernel.org
Cc:     saeed.mirzamohammadi@...cle.com,
        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-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH 5.4 0/1] mm: allow a controlled amount of unfairness in the page lock

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

Backporting this fixes the regression (this is already in 5.9+):
- 5ef64cc8987a mm: allow a controlled amount of unfairness in the page lock

Linus Torvalds (1):
  mm: allow a controlled amount of unfairness in the page lock

 include/linux/mm.h   |   2 +
 include/linux/wait.h |   2 +
 kernel/sysctl.c      |   8 +++
 mm/filemap.c         | 160 ++++++++++++++++++++++++++++++++++---------
 4 files changed, 141 insertions(+), 31 deletions(-)

-- 
2.41.0