[PATCH] mm: swap prefetch sched batch

[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>

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

Index: linux-2.6.17-rc3-mm1/mm/swap_prefetch.c
===================================================================
--- linux-2.6.17-rc3-mm1.orig/mm/swap_prefetch.c	2006-05-08 23:56:17.000000000 +1000
+++ linux-2.6.17-rc3-mm1/mm/swap_prefetch.c	2006-05-09 00:00:21.000000000 +1000
@@ -504,6 +504,9 @@ 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);

-- 
-ck