linux-kernel - Re: [PATCH v3 1/2] timers: Implement usleep_idle

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Message-ID: <874k7yhamp.ffs@tglx>
Date:   Fri, 26 Nov 2021 22:26:06 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     SeongJae Park <sj@...nel.org>, akpm@...ux-foundation.org
Cc:     oleksandr@...alenko.name, john.stultz@...aro.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        SeongJae Park <sj@...nel.org>
Subject: Re: [PATCH v3 1/2] timers: Implement usleep_idle_range()

On Fri, Nov 26 2021 at 14:50, SeongJae Park wrote:
> Some kernel threads such as DAMON could need to repeatedly sleep in
> micro seconds level.  Because usleep_range() sleeps in uninterruptible
> state, however, such threads would make /proc/loadavg reports fake load.
>
> To help such cases, this commit implements a variant of usleep_range()
> called usleep_idle_range().  It is same to usleep_range() but sets the
> state of the current task as TASK_IDLE while sleeping.
>
> Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: SeongJae Park <sj@...nel.org>

Andrew, I assume you want to pick that up along with the mm fix, right?

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>