This is to prevent unnecessary scanning of short lived tasks to reduce CPU burning. Signed-off-by: Raghavendra K T --- mm/kscand.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/mm/kscand.c b/mm/kscand.c index 39a7fcef7de8..880c3693866d 100644 --- a/mm/kscand.c +++ b/mm/kscand.c @@ -28,6 +28,7 @@ static struct task_struct *kscand_thread __read_mostly; static DEFINE_MUTEX(kscand_mutex); +extern unsigned int sysctl_numa_balancing_scan_delay; /* * Total VMA size to cover during scan. @@ -1010,6 +1011,7 @@ void __kscand_enter(struct mm_struct *mm) { struct kscand_mm_slot *kscand_slot; struct mm_slot *slot; + unsigned long now; int wakeup; /* __kscand_exit() must not run from under us */ @@ -1020,10 +1022,12 @@ void __kscand_enter(struct mm_struct *mm) if (!kscand_slot) return; + now = jiffies; kscand_slot->address = 0; kscand_slot->scan_period = kscand_mm_scan_period_ms; kscand_slot->scan_size = kscand_scan_size; - kscand_slot->next_scan = 0; + kscand_slot->next_scan = now + + 2 * msecs_to_jiffies(sysctl_numa_balancing_scan_delay); kscand_slot->scan_delta = 0; slot = &kscand_slot->slot; -- 2.34.1