From: Con Kolivas <kernel@kolivas.org>

kprefetchd is a latency insensitive ultra low priority task.  Set it to
SCHED_BATCH to obtain the benefit of this scheduling policy hint.

Signed-off-by: Con Kolivas <kernel@kolivas.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 mm/swap_prefetch.c |    3 +++
 1 files changed, 3 insertions(+)

diff -puN mm/swap_prefetch.c~mm-implement-swap-prefetching-sched-batch mm/swap_prefetch.c
--- devel/mm/swap_prefetch.c~mm-implement-swap-prefetching-sched-batch	2006-05-10 23:09:25.000000000 -0700
+++ devel-akpm/mm/swap_prefetch.c	2006-05-10 23:09:25.000000000 -0700
@@ -505,6 +505,9 @@ static enum trickle_return trickle_swap(
 
 static int kprefetchd(void *__unused)
 {
+	struct sched_param param = { .sched_priority = 0 };
+
+	sched_setscheduler(current, SCHED_BATCH, &param);
 	set_user_nice(current, 19);
 	/* Set ioprio to lowest if supported by i/o scheduler */
 	sys_ioprio_set(IOPRIO_WHO_PROCESS, 0, IOPRIO_CLASS_IDLE);
_