From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pb0-f48.google.com (mail-pb0-f48.google.com [209.85.160.48]) by kanga.kvack.org (Postfix) with ESMTP id 8320590001D for ; Fri, 27 Sep 2013 09:28:27 -0400 (EDT) Received: by mail-pb0-f48.google.com with SMTP id ma3so2557096pbc.35 for ; Fri, 27 Sep 2013 06:28:27 -0700 (PDT) From: Mel Gorman Subject: [PATCH 34/63] sched: numa: increment numa_migrate_seq when task runs in correct location Date: Fri, 27 Sep 2013 14:27:19 +0100 Message-Id: <1380288468-5551-35-git-send-email-mgorman@suse.de> In-Reply-To: <1380288468-5551-1-git-send-email-mgorman@suse.de> References: <1380288468-5551-1-git-send-email-mgorman@suse.de> Sender: owner-linux-mm@kvack.org List-ID: To: Peter Zijlstra , Rik van Riel Cc: Srikar Dronamraju , Ingo Molnar , Andrea Arcangeli , Johannes Weiner , Linux-MM , LKML , Mel Gorman From: Rik van Riel 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 --- 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 00ccc68..1a17e5e 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)) -- 1.8.1.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org