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From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, brendanhiggins@google.com,
	linux-mm@kvack.org, mm-commits@vger.kernel.org, shuah@kernel.org,
	sj@kernel.org, torvalds@linux-foundation.org
Subject: [patch 07/21] mm/damon/core: use better timer mechanisms selection threshold
Date: Fri, 10 Dec 2021 14:46:28 -0800	[thread overview]
Message-ID: <20211210224628.Kbw1PsKxu%akpm@linux-foundation.org> (raw)
In-Reply-To: <20211210144539.663efee2c80d8450e6180230@linux-foundation.org>

From: SeongJae Park <sj@kernel.org>
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@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>
---

 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);
_

  parent reply	other threads:[~2021-12-10 22:46 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-10 22:45 incoming Andrew Morton
2021-12-10 22:46 ` [patch 01/21] Increase default MLOCK_LIMIT to 8 MiB Andrew Morton
2021-12-11  1:08   ` Linus Torvalds
2021-12-10 22:46 ` [patch 02/21] MAINTAINERS: update kdump maintainers Andrew Morton
2021-12-10 22:46 ` [patch 03/21] mailmap: update email address for Guo Ren Andrew Morton
2021-12-10 22:46 ` [patch 04/21] filemap: remove PageHWPoison check from next_uptodate_page() Andrew Morton
2021-12-10 22:46 ` [patch 05/21] timers: implement usleep_idle_range() Andrew Morton
2021-12-10 22:46 ` [patch 06/21] mm/damon/core: fix fake load reports due to uninterruptible sleeps Andrew Morton
2021-12-10 22:46 ` Andrew Morton [this message]
2021-12-10 22:46 ` [patch 08/21] mm/damon/dbgfs: remove an unnecessary error message Andrew Morton
2021-12-10 22:46 ` [patch 09/21] mm/damon/core: remove unnecessary error messages Andrew Morton
2021-12-10 22:46 ` [patch 10/21] mm/damon/vaddr: remove an unnecessary warning message Andrew Morton
2021-12-10 22:46 ` [patch 11/21] mm/damon/vaddr-test: split a test function having >1024 bytes frame size Andrew Morton
2021-12-10 22:46 ` [patch 12/21] mm/damon/vaddr-test: remove unnecessary variables Andrew Morton
2021-12-10 22:46 ` [patch 13/21] selftests/damon: skip test if DAMON is running Andrew Morton
2021-12-10 22:46 ` [patch 14/21] selftests/damon: test DAMON enabling with empty target_ids case Andrew Morton
2021-12-10 22:46 ` [patch 15/21] selftests/damon: test wrong DAMOS condition ranges input Andrew Morton
2021-12-10 22:46 ` [patch 16/21] selftests/damon: test debugfs file reads/writes with huge count Andrew Morton
2021-12-10 22:46 ` [patch 17/21] selftests/damon: split test cases Andrew Morton
2021-12-10 22:47 ` [patch 18/21] mm/slub: fix endianness bug for alloc/free_traces attributes Andrew Morton
2021-12-10 22:47 ` [patch 19/21] mm/memcg: relocate mod_objcg_mlstate(), get_obj_stock() and put_obj_stock() Andrew Morton
2021-12-10 22:47 ` [patch 20/21] hugetlbfs: fix issue of preallocation of gigantic pages can't work Andrew Morton
2021-12-10 22:47 ` [patch 21/21] mm: bdi: initialize bdi_min_ratio when bdi is unregistered Andrew Morton

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