diff options
| author | Rik van Riel <riel@redhat.com> | 2014-06-23 19:41:34 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-07-05 13:17:39 +0400 |
| commit | db015daedb56251b73f956f70b3b8813f80d8ee1 (patch) | |
| tree | 9883ace8d1f2edf4ae39a5f3348eea5e7c96f336 /kernel/sched | |
| parent | 0132c3e1777ceabc24c7d209b7cbe78c28c03c09 (diff) | |
| download | linux-db015daedb56251b73f956f70b3b8813f80d8ee1.tar.xz | |
sched/numa: Rework best node setting in task_numa_migrate()
Fix up the best node setting in task_numa_migrate() to deal with a task
in a pseudo-interleaved NUMA group, which is already running in the
best location.
Set the task's preferred nid to the current nid, so task migration is
not retried at a high rate.
Signed-off-by: Rik van Riel <riel@redhat.com>
Cc: mgorman@suse.de
Cc: chegu_vinod@hp.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1403538095-31256-7-git-send-email-riel@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/fair.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 9d1734a724a8..7bb2f464b456 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1354,10 +1354,6 @@ static int task_numa_migrate(struct task_struct *p) } } - /* No better CPU than the current one was found. */ - if (env.best_cpu == -1) - return -EAGAIN; - /* * If the task is part of a workload that spans multiple NUMA nodes, * and is migrating into one of the workload's active nodes, remember @@ -1366,8 +1362,19 @@ static int task_numa_migrate(struct task_struct *p) * A task that migrated to a second choice node will be better off * trying for a better one later. Do not set the preferred node here. */ - if (p->numa_group && node_isset(env.dst_nid, p->numa_group->active_nodes)) - sched_setnuma(p, env.dst_nid); + if (p->numa_group) { + if (env.best_cpu == -1) + nid = env.src_nid; + else + nid = env.dst_nid; + + if (node_isset(nid, p->numa_group->active_nodes)) + sched_setnuma(p, env.dst_nid); + } + + /* No better CPU than the current one was found. */ + if (env.best_cpu == -1) + return -EAGAIN; /* * Reset the scan period if the task is being rescheduled on an |