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UPSTREAM: mm/damon/core: use better timer mechanisms selection threshold

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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>

(cherry picked from commit 4de46a30b9929d3d1b29e481d48e9c25f8ac7919)

Bug: 228223814
Signed-off-by: Hailong Tu <tuhailong@oppo.com>
Change-Id: Ieb5e3e196c96d8d54c83fecec53fdd13db763b62
This commit is contained in:
SeongJae Park 2021-12-10 14:46:28 -08:00 committed by Hailong Tu
parent 63e8bc85e6
commit f37ab7f595
1 changed files with 2 additions and 1 deletions
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3
mm/damon/core.c
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@ -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);