| From | Mel Gorman <> | Subject | [PATCH 34/63] sched: numa: increment numa_migrate_seq when task runs in correct location | Date | Mon, 7 Oct 2013 11:29:12 +0100 |
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From: Rik van Riel <riel@redhat.com>
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@suse.de: Only increment migrate_seq if migration temporarily disabled] Signed-off-by: Rik van Riel <riel@redhat.com> --- 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
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