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BACKPORT: 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: zhijun wan <wanzhijun@oppo.com>
Change-Id: Ieb5e3e196c96d8d54c83fecec53fdd13db763b62
This commit is contained in:
SeongJae Park
2021-12-10 14:46:28 -08:00
committed by Suren Baghdasaryan
parent d49b62ccfd
commit e5a2bdfb0a
1 changed files with 1 additions and 1 deletions
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2
mm/damon/core.c
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@@ -457,7 +457,7 @@ int damon_start(struct damon_ctx **ctxs, int nr_ctxs)
static void kdamond_usleep(unsigned long usecs) static void kdamond_usleep(unsigned long usecs)
{ {
/* See Documentation/timers/timers-howto.rst for the thresholds */ /* See Documentation/timers/timers-howto.rst for the thresholds */
if (usecs > 20 * 1000) if (usecs > 20 * USEC_PER_MSEC)
schedule_timeout_idle(usecs_to_jiffies(usecs)); schedule_timeout_idle(usecs_to_jiffies(usecs));
else else
usleep_idle_range(usecs, usecs + 1); usleep_idle_range(usecs, usecs + 1);