From 4de46a30b9929d3d1b29e481d48e9c25f8ac7919 Mon Sep 17 00:00:00 2001 From: SeongJae Park Date: Fri, 10 Dec 2021 14:46:28 -0800 Subject: 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: ee801b7dd7822 ("mm/damon/schemes: activate schemes based on a watermarks mechanism") Signed-off-by: SeongJae Park Cc: Shuah Khan Cc: Brendan Higgins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/damon/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'mm') diff --git a/mm/damon/core.c b/mm/damon/core.c index 2daffd5820fe..eefb2ada67ca 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -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); -- cgit v1.2.3