linux-kernel - Re: [PATCH 2/3] wait: Return number of exclusive waiters awaken

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Message-ID: <Y3VGd4f/nk7r+Eoc@hirez.programming.kicks-ass.net>
Date:   Wed, 16 Nov 2022 21:22:15 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Gabriel Krisman Bertazi <krisman@...e.de>
Cc:     axboe@...nel.dk, mingo@...hat.com, jack@...e.cz,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        liusong@...ux.alibaba.com, chaitanyak@...dia.com
Subject: Re: [PATCH 2/3] wait: Return number of exclusive waiters awaken

On Tue, Nov 15, 2022 at 05:45:52PM -0500, Gabriel Krisman Bertazi wrote:
> Sbitmap code will need to know how many waiters were actually woken for
> its batched wakeups implementation.  Return the number of woken
> exclusive waiters from __wake_up() to facilitate that.
> 
> Suggested-by: Jan Kara <jack@...e.cz>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...e.de>

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>

> ---
>  include/linux/wait.h |  2 +-
>  kernel/sched/wait.c  | 18 +++++++++++-------
>  2 files changed, 12 insertions(+), 8 deletions(-)