The patch titled
Subject: mm/damon/core: use better timer mechanisms selection threshold
has been added to the -mm tree. Its filename is
mm-damon-core-use-better-timer-mechanisms-selection-threshold.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-damon-core-use-better-timer-mechanisms-selection-threshold.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-damon-core-use-better-timer-mechanisms-selection-threshold.patch
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------------------------------------------------------
From: SeongJae Park <sj@xxxxxxxxxx>
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@xxxxxxxxxx
Fixes: ee801b7dd7822 ("mm/damon/schemes: activate schemes based on a watermarks mechanism")
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/damon/core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/mm/damon/core.c~mm-damon-core-use-better-timer-mechanisms-selection-threshold
+++ a/mm/damon/core.c
@@ -980,7 +980,8 @@ static unsigned long damos_wmark_wait_us
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);
_
Patches currently in -mm which might be from sj@xxxxxxxxxx are
timers-implement-usleep_idle_range.patch
mm-damon-core-fix-fake-load-reports-due-to-uninterruptible-sleeps.patch
mm-damon-core-use-better-timer-mechanisms-selection-threshold.patch
mm-damon-dbgfs-remove-an-unnecessary-error-message.patch
mm-damon-core-remove-unnecessary-error-messages.patch
mm-damon-vaddr-remove-an-unnecessary-warning-message.patch
mm-damon-vaddr-test-split-a-test-function-having-1024-bytes-frame-size.patch
mm-damon-vaddr-test-remove-unnecessary-variables.patch
selftests-damon-skip-test-if-damon-is-running.patch
selftests-damon-test-damon-enabling-with-empty-target_ids-case.patch
selftests-damon-test-wrong-damos-condition-ranges-input.patch
selftests-damon-test-debugfs-file-reads-writes-with-huge-count.patch
selftests-damon-split-test-cases.patch
mm-damon-remove-some-no-need-func-definitions-in-damonh-file-fix.patch
