From:   Thomas Gleixner <tglx@linutronix.de>
To:     SeongJae Park <sj@kernel.org>, akpm@linux-foundation.org
Cc:     oleksandr@natalenko.name, john.stultz@linaro.org,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        SeongJae Park <sj@kernel.org>
Subject: Re: [PATCH v3 1/2] timers: Implement usleep_idle_range()
In-Reply-To: <20211126145015.15862-2-sj@kernel.org>
References: <20211126145015.15862-1-sj@kernel.org>
 <20211126145015.15862-2-sj@kernel.org>
Date:   Fri, 26 Nov 2021 22:26:06 +0100
Message-ID: <874k7yhamp.ffs@tglx>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

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@linux-foundation.org>
> Signed-off-by: SeongJae Park <sj@kernel.org>

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

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