sched/numa, mm: Remove p->numa_migrate_deferred

Excessive migration of pages can hurt the performance of workloads
that span multiple NUMA nodes.  However, it turns out that the
p->numa_migrate_deferred knob is a really big hammer, which does
reduce migration rates, but does not actually help performance.

Now that the second stage of the automatic numa balancing code
has stabilized, it is time to replace the simplistic migration
deferral code with something smarter.

Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Chegu Vinod <chegu_vinod@hp.com>
Link: http://lkml.kernel.org/r/1390860228-21539-2-git-send-email-riel@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index ffccdad050b5..d572d5ba650f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1457,7 +1457,6 @@ struct task_struct {
         unsigned int numa_scan_period;
         unsigned int numa_scan_period_max;
         int numa_preferred_nid;
-        int numa_migrate_deferred;
         unsigned long numa_migrate_retry;
         u64 node_stamp;                 /* migration stamp  */
         struct callback_head numa_work;