linux-kernel - Re: [PATCH] mm/rmap: Fix misplaced parenthesis of a likely()

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Message-ID: <20231201151535.06c7aaaf@gandalf.local.home>
Date:   Fri, 1 Dec 2023 15:15:35 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm/rmap: Fix misplaced parenthesis of a likely()

On Fri, 1 Dec 2023 21:06:22 +0100
David Hildenbrand <david@...hat.com> wrote:

> But
> 
> > Cc: stable@...r.kernel.org  
> 
> stable, really? Why?
> 
> > Fixes:fb3d824d1a46c ("mm/rmap: split page_dup_rmap() into page_dup_file_rmap() and page_try_dup_anon_rmap()")  
> 
> and does it even fix a real bug?

As a performance person, who measures likely and unlikely results (the
ftrace ring buffer was sped up by over 50% with strategically placed
likely/unlikely annotation). I find this to be a real bug, and something I
would want backported to the kernels we maintain in ChromeOS (which uses
upstream stable kernels).

-- Steve