linux-kernel - [PATCH v3 08/16] mm/damon/core: Use generic upper bound recommondation for usleep

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Message-Id: <20241014-devel-anna-maria-b4-timers-flseep-v3-8-dc8b907cb62f@linutronix.de>
Date: Mon, 14 Oct 2024 10:22:25 +0200
From: Anna-Maria Behnsen <anna-maria@...utronix.de>
To: Frederic Weisbecker <frederic@...nel.org>, 
 Thomas Gleixner <tglx@...utronix.de>, Jonathan Corbet <corbet@....net>
Cc: linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, rust-for-linux@...r.kernel.org, 
 Alice Ryhl <aliceryhl@...gle.com>, 
 FUJITA Tomonori <fujita.tomonori@...il.com>, Andrew Lunn <andrew@...n.ch>, 
 Anna-Maria Behnsen <anna-maria@...utronix.de>, 
 Miguel Ojeda <ojeda@...nel.org>, SeongJae Park <sj@...nel.org>, 
 Andrew Morton <akpm@...ux-foundation.org>, damon@...ts.linux.dev, 
 linux-mm@...ck.org
Subject: [PATCH v3 08/16] mm/damon/core: Use generic upper bound
 recommondation for usleep_range()

The upper bound for usleep_range_idle() was taken from the outdated
documentation. As a recommondation for the upper bound of usleep_range()
depends on HZ configuration it is not possible to hard code it.

Use the define "USLEEP_RANGE_UPPER_BOUND" instead.

Cc: SeongJae Park <sj@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: damon@...ts.linux.dev
Cc: linux-mm@...ck.org
Signed-off-by: Anna-Maria Behnsen <anna-maria@...utronix.de>
Reviewed-by: SeongJae Park <sj@...nel.org>
Reviewed-by: Frederic Weisbecker <frederic@...nel.org>
---
 mm/damon/core.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index c725c78b43f0..79efd8089d6c 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -1892,8 +1892,7 @@ static unsigned long damos_wmark_wait_us(struct damos *scheme)

 static void kdamond_usleep(unsigned long usecs)
 {
-	/* See Documentation/timers/timers-howto.rst for the thresholds */
-	if (usecs > 20 * USEC_PER_MSEC)
+	if (usecs >= USLEEP_RANGE_UPPER_BOUND)
 		schedule_timeout_idle(usecs_to_jiffies(usecs));
 	else
 		usleep_range_idle(usecs, usecs + 1);

-- 
2.39.5