0105-ksm-wakeups.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <arjan@linux.intel.com>
Date: Mon, 6 May 2019 12:57:09 -0500
Subject: [PATCH] ksm-wakeups

reduce wakeups in ksm by adding rounding (aligning) when
the sleep times are 1 second or longer

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
---
 kernel/watchdog.c |  2 +-
 mm/ksm.c          | 11 ++++++++---
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 99afb88d2e85..e24483521e17 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -41,7 +41,7 @@ unsigned long __read_mostly watchdog_enabled;
 int __read_mostly watchdog_user_enabled = 1;
 int __read_mostly nmi_watchdog_user_enabled = NMI_WATCHDOG_DEFAULT;
 int __read_mostly soft_watchdog_user_enabled = 1;
-int __read_mostly watchdog_thresh = 10;
+int __read_mostly watchdog_thresh = 40;
 static int __read_mostly nmi_watchdog_available;
 
 struct cpumask watchdog_cpumask __read_mostly;
diff --git a/mm/ksm.c b/mm/ksm.c
index c20bd4d9a0d9..702a2a111fef 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -2421,9 +2421,14 @@ static int ksm_scan_thread(void *nothing)
 
 		if (ksmd_should_run()) {
 			sleep_ms = READ_ONCE(ksm_thread_sleep_millisecs);
-			wait_event_interruptible_timeout(ksm_iter_wait,
-				sleep_ms != READ_ONCE(ksm_thread_sleep_millisecs),
-				msecs_to_jiffies(sleep_ms));
+			if (sleep_ms >= 1000)
+				wait_event_interruptible_timeout(ksm_iter_wait,
+					sleep_ms != READ_ONCE(ksm_thread_sleep_millisecs),
+					msecs_to_jiffies(round_jiffies_relative(sleep_ms)));
+			else
+				wait_event_interruptible_timeout(ksm_iter_wait,
+					sleep_ms != READ_ONCE(ksm_thread_sleep_millisecs),
+					msecs_to_jiffies(sleep_ms));
 		} else {
 			wait_event_freezable(ksm_thread_wait,
 				ksmd_should_run() || kthread_should_stop());
-- 
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