linux-kernel - Re: [PATCH] futex: Use a hashmask instead of hashsize.

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Message-ID: <be388631-75a5-4890-b7c4-063a08e6c7e1@igalia.com>
Date: Wed, 26 Feb 2025 22:54:23 -0300
From: André Almeida <andrealmeid@...lia.com>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: linux-kernel@...r.kernel.org, Darren Hart <dvhart@...radead.org>,
 Davidlohr Bueso <dave@...olabs.net>, Ingo Molnar <mingo@...hat.com>,
 Juri Lelli <juri.lelli@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 Valentin Schneider <vschneid@...hat.com>, Waiman Long <longman@...hat.com>,
 Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] futex: Use a hashmask instead of hashsize.

Em 26/02/2025 06:10, Sebastian Andrzej Siewior escreveu:
> The global hash uses futex_hashsize to save the amount of the hash
> buckets that have been allocated during system boot. On each
> futex_hash() invocation this number is substracted by one to get the
> mask. This can be optimized by saving directly the mask avoiding the
> substraction on each futex_hash() invocation.
> 
> Rename futex_hashsize to futex_hashmask and save the mask of the
> allocated hash map.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Reviewed-by: André Almeida <andrealmeid@...lia.com>