Commit 4de46a30 authored by SeongJae Park's avatar SeongJae Park Committed by Linus Torvalds
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mm/damon/core: use better timer mechanisms selection threshold 

Patch series "mm/damon: Trivial fixups and improvements".

This patchset contains trivial fixups and improvements for DAMON and its
kunit/kselftest tests.

This patch (of 11):

DAMON is using hrtimer if requested sleep time is <=100ms, while the
suggested threshold[1] is <=20ms.  This commit applies the threshold.

[1] Documentation/timers/timers-howto.rst

Link: https://lkml.kernel.org/r/20211201150440.1088-2-sj@kernel.org


Fixes: ee801b7d ("mm/damon/schemes: activate schemes based on a watermarks mechanism")
Signed-off-by: default avatarSeongJae Park <sj@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 70e92748

mm/damon/core.c

+2 −1
Original line number Diff line number Diff line
@@ -980,7 +980,8 @@ static unsigned long damos_wmark_wait_us(struct damos *scheme) 


static void kdamond_usleep(unsigned long usecs)

{

	if (usecs > 100 * 1000)

	/* See Documentation/timers/timers-howto.rst for the thresholds */

	if (usecs > 20 * USEC_PER_MSEC)

		schedule_timeout_idle(usecs_to_jiffies(usecs));

	else

		usleep_idle_range(usecs, usecs + 1);