diff options
| author | Rik van Riel <riel@redhat.com> | 2013-10-07 11:29:12 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-09 12:40:41 +0200 |
| commit | 06ea5e035b4e66cc77790457a89fc7e368060c4b (patch) | |
| tree | 225dd9d1d180dcca19cce9ce8c3762b9c1cee7dc /kernel/sched | |
| parent | 6b9a7460b6baf6c77fc3d23d927ddfc3f3f05bf3 (diff) | |
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 <riel@redhat.com>
[ Only increment migrate_seq if migration temporarily disabled. ]
Signed-off-by: Mel Gorman <mgorman@suse.de>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-35-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/fair.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index f84ac3fb581b..de9b4d8eb853 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)) |