[PATCH] [sched-int-changes 1/5] alter_kthread_prio

[Con Kolivas]

alter_kthread_prio.diff

As discussed previously with Ingo; please include in at least one -mm
release.

Timeslice proportion has been increased substantially for -niced tasks. As
a result of this kernel threads have much larger timeslices than they
previously had.

Change kernel threads' nice value to -5 to bring their timeslice back in line
with previous behaviour. This means kernel threads will be less likely to
cause large latencies under periods of system stress for normal nice 0
tasks.

Signed-off-by: Con Kolivas <kernel@xxxxxxxxxxx>

Index: linux-2.6.10-rc1-mm2/kernel/workqueue.c
===================================================================
--- linux-2.6.10-rc1-mm2.orig/kernel/workqueue.c	2004-11-02 13:19:19.000000000 +1100
+++ linux-2.6.10-rc1-mm2/kernel/workqueue.c	2004-11-02 14:13:13.196261374 +1100
@@ -188,7 +188,7 @@ static int worker_thread(void *__cwq)
 
 	current->flags |= PF_NOFREEZE;
 
-	set_user_nice(current, -10);
+	set_user_nice(current, -5);
 
 	/* Block and flush all signals */
 	sigfillset(&blocked);

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