linux-kernel - Re: [PATCH][next] mm/mincore: improve performance by adding an unlikely hint

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Message-Id: <20250218160842.2fd9fd47b47704681cad1e5b@linux-foundation.org>
Date: Tue, 18 Feb 2025 16:08:42 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: "Colin King (gmail)" <colin.i.king@...il.com>
Cc: Matthew Wilcox <willy@...radead.org>, linux-mm@...ck.org,
 kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] mm/mincore: improve performance by adding an
 unlikely hint

On Tue, 18 Feb 2025 14:16:20 +0000 "Colin King (gmail)" <colin.i.king@...il.com> wrote:

> >> Improvement was from ~970 down to 963 ns, so small ~0.7% improvement.
> >>
> > 
> > It actually doesn't change the generated code:
> 
> I've compare the generated x86 object code using gcc 14.2.1 20240912 
> (Fedora 41) and 14.2.0 (Debian 14.2.0-17), 14.2.1 20250211 (Clear Linux) 
> and I get differences in the generated object code comparing old and 
> new, and the improvement on ClearLinux is more significant too because 
> it uses -O3. So I'm confident the change is generating improved object code.

I was using gcc-13.2.0.

Please resend, with a Matthew-friendly changelog?