linux-kernel - Re: [PATCH v2 0/2] bitops: Optimize fns() for improved performance

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Date: Tue, 30 Apr 2024 14:11:45 +0800
From: Kuan-Wei Chiu <visitorckw@...il.com>
To: akpm@...ux-foundation.org, yury.norov@...il.com
Cc: linux@...musvillemoes.dk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/2] bitops: Optimize fns() for improved performance

On Tue, Apr 30, 2024 at 01:49:10PM +0800, Kuan-Wei Chiu wrote:
> Hello,
> 
> This patch series optimizes the fns() function by avoiding repeated
> calls to __ffs(). Additionally, tests for fns() have been added in
> lib/find_bit_benchmark.c.
> 
> Changes in v2:
> - Add benchmark test for fns() in lib/find_bit_benchmark.c.
> - Change the loop in fns() by counting down from n to 0.
> - Add find_bit benchmark result for find_nth_bit in commit message.
> 
> Link to v1: https://lkml.kernel.org/20240406235532.613696-1-visitorckw@gmail.com

Sorry for pasting the wrong link, the link to v1 should be:
https://lkml.kernel.org/20240426035152.956702-1-visitorckw@gmail.com

Regards,
Kuan-Wei
> 
> Kuan-Wei Chiu (2):
>   lib/find_bit_benchmark: Add benchmark test for fns()
>   bitops: Optimize fns() for improved performance
> 
>  include/linux/bitops.h   | 12 +++---------
>  lib/find_bit_benchmark.c | 25 +++++++++++++++++++++++++
>  2 files changed, 28 insertions(+), 9 deletions(-)
> 
> -- 
> 2.34.1
>