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authorSeongJae Park <sj@kernel.org>2021-12-10 14:46:28 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-12-10 17:10:55 -0800
commit4de46a30b9929d3d1b29e481d48e9c25f8ac7919 (patch)
tree41c5f5db9adaec68ab433e0f943c3421840412ea /mm/damon
parent70e9274805fccfd175d0431a947bfd11ee7df40e (diff)
downloadlinux-4de46a30b9929d3d1b29e481d48e9c25f8ac7919.tar.bz2
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 <sj@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Brendan Higgins <brendanhiggins@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/damon')
-rw-r--r--mm/damon/core.c3
1 files changed, 2 insertions, 1 deletions
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);