Commit-ID: 06ea5e035b4e66cc77790457a89fc7e368060c4b Gitweb: http://git.kernel.org/tip/06ea5e035b4e66cc77790457a89fc7e368060c4b Author: Rik van Riel <r...@redhat.com> AuthorDate: Mon, 7 Oct 2013 11:29:12 +0100 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Wed, 9 Oct 2013 12:40:41 +0200
sched/numa: Increment numa_migrate_seq when task runs in correct location 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. Signed-off-by: Rik van Riel <r...@redhat.com> [ Only increment migrate_seq if migration temporarily disabled. ] Signed-off-by: Mel Gorman <mgor...@suse.de> Cc: Andrea Arcangeli <aarca...@redhat.com> Cc: Johannes Weiner <han...@cmpxchg.org> Cc: Srikar Dronamraju <sri...@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra <pet...@infradead.org> Link: http://lkml.kernel.org/r/1381141781-10992-35-git-send-email-mgor...@suse.de Signed-off-by: Ingo Molnar <mi...@kernel.org> --- 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 f84ac3f..de9b4d8 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)) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
