From: SeongJae Park <sj@kernel.org>
To: akpm@linux-foundation.org
Cc: shuah@kernel.org, brendanhiggins@google.com, linux-mm@kvack.org,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
SeongJae Park <sj@kernel.org>
Subject: [PATCH 01/11] mm/damon/core: Use better timer mechanisms selection threshold
Date: Wed, 1 Dec 2021 15:04:30 +0000 [thread overview]
Message-ID: <20211201150440.1088-2-sj@kernel.org> (raw)
In-Reply-To: <20211201150440.1088-1-sj@kernel.org>
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
Fixes: ee801b7dd7822 ("mm/damon/schemes: activate schemes based on a watermarks mechanism")
Signed-off-by: SeongJae Park <sj@kernel.org>
---
mm/damon/core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/damon/core.c b/mm/damon/core.c
index 8cd8fddc931e..ccc62479549a 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -978,7 +978,8 @@ 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);
--
2.17.1
next prev parent reply other threads:[~2021-12-01 15:05 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-01 15:04 [PATCH 00/11] mm/damon: Trivial fixups and improvements SeongJae Park
2021-12-01 15:04 ` SeongJae Park [this message]
2021-12-01 15:04 ` [PATCH 02/11] mm/damon/dbgfs: Remove an unnecessary error message SeongJae Park
2021-12-08 6:29 ` Xin Hao
2021-12-08 12:49 ` SeongJae Park
2021-12-08 15:13 ` Xin Hao
2021-12-08 16:48 ` SeongJae Park
2021-12-01 15:04 ` [PATCH 03/11] mm/damon/core: Remove unnecessary error messages SeongJae Park
2021-12-01 15:04 ` [PATCH 04/11] mm/damon/vaddr: Remove an unnecessary warning message SeongJae Park
2021-12-03 3:01 ` Muchun Song
2021-12-03 20:44 ` Andrew Morton
2021-12-04 2:37 ` Muchun Song
2021-12-01 15:04 ` [PATCH 05/11] mm/damon/vaddr-test: Split a test function having >1024 bytes frame size SeongJae Park
2021-12-01 15:04 ` [PATCH 06/11] mm/damon/vaddr-test: Remove unnecessary variables SeongJae Park
2021-12-01 15:04 ` [PATCH 07/11] selftests/damon: Skip test if DAMON is running SeongJae Park
2021-12-01 15:04 ` [PATCH 08/11] selftests/damon: Test DAMON enabling with empty target_ids case SeongJae Park
2021-12-01 15:04 ` [PATCH 09/11] selftests/damon: Test wrong DAMOS condition ranges input SeongJae Park
2021-12-01 15:04 ` [PATCH 10/11] selftests/damon: Test debugfs file reads/writes with huge count SeongJae Park
2021-12-01 15:04 ` [PATCH 11/11] selftests/damon: Split test cases SeongJae Park
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