This is to prevent unnecessary scanning of short lived tasks
spending in scanning.
Signed-off-by: Raghavendra K T <raghavendra.kt@xxxxxxx>
---
mm/kmmscand.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/mm/kmmscand.c b/mm/kmmscand.c
index a19b1f31271d..84140b9e8ce2 100644
--- a/mm/kmmscand.c
+++ b/mm/kmmscand.c
@@ -28,6 +28,7 @@
static struct task_struct *kmmscand_thread __read_mostly;
static DEFINE_MUTEX(kmmscand_mutex);
+extern unsigned int sysctl_numa_balancing_scan_delay;
/*
* Total VMA size to cover during scan.
@@ -880,6 +881,7 @@ void __kmmscand_enter(struct mm_struct *mm)
{
struct kmmscand_mm_slot *kmmscand_slot;
struct mm_slot *slot;
+ unsigned long now;
int wakeup;
/* __kmmscand_exit() must not run from under us */
@@ -890,10 +892,12 @@ void __kmmscand_enter(struct mm_struct *mm)
if (!kmmscand_slot)
return;
+ now = jiffies;
kmmscand_slot->address = 0;
kmmscand_slot->scan_period = kmmscand_mm_scan_period_ms;
kmmscand_slot->scan_size = kmmscand_scan_size;
- kmmscand_slot->next_scan = 0;
+ kmmscand_slot->next_scan = now +
+ msecs_to_jiffies(sysctl_numa_balancing_scan_delay);
kmmscand_slot->scan_delta = 0;
slot = &kmmscand_slot->slot;
--
2.34.1
