[PATCH 34/63] sched: numa: increment numa_migrate_seq when task runs in correct location

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Rik van Riel <riel@xxxxxxxxxx>

When a task is already running on its preferred node, increment
numa_migrate_seq to indicate that the task is settled if migration is
temporarily disabled, and memory should migrate towards it.

[mgorman@xxxxxxx: Only increment migrate_seq if migration temporarily disabled]
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
---
 kernel/sched/fair.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 559175b..9a2e68e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1016,8 +1016,16 @@ static void numa_migrate_preferred(struct task_struct *p)
 {
 	/* Success if task is already running on preferred CPU */
 	p->numa_migrate_retry = 0;
-	if (cpu_to_node(task_cpu(p)) == p->numa_preferred_nid)
+	if (cpu_to_node(task_cpu(p)) == p->numa_preferred_nid) {
+		/*
+		 * If migration is temporarily disabled due to a task migration
+		 * then re-enable it now as the task is running on its
+		 * preferred node and memory should migrate locally
+		 */
+		if (!p->numa_migrate_seq)
+			p->numa_migrate_seq++;
 		return;
+	}
 
 	/* This task has no NUMA fault statistics yet */
 	if (unlikely(p->numa_preferred_nid == -1))
-- 
1.8.4

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>




[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux]     [Linux OMAP]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]