From: Con Kolivas <kernel@kolivas.org>
To: Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH] O16.2int
Date: Mon, 18 Aug 2003 00:59:07 +1000
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On Sun, 17 Aug 2003 17:40, Andrew Morton wrote:
> Con Kolivas <kernel@kolivas.org> wrote:
> > Much simpler
>
> But broken.
>
> The machine runs about 100x slower than normal.  The screensaver cut in
> halfway through the initscripts ;) That's on 2-way.  The same kernel works
> OK on uniprocessor.

Reverting the !in_interrupt nonsense should be enough to avoid the dreaded 
screensaver at boottime I hope. Does this fix it?

Starvation will be approached differently.

Change:
Make preemption occur as vanilla again except for now not preempting same 
priority tasks with less timeslice.

Con

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--- linux-2.6.0-test3-mm2-O16.2/kernel/sched.c	2003-08-18 00:03:53.000000000 +1000
+++ linux-2.6.0-test3-mm2-O16.3/kernel/sched.c	2003-08-18 00:44:20.000000000 +1000
@@ -609,9 +609,8 @@ repeat_lock_task:
 				__activate_task(p, rq);
 			else {
 				activate_task(p, rq);
-				if (TASK_PREEMPTS_CURR(p, rq) &&
-					(in_interrupt() || !p->mm))
-						resched_task(rq->curr);
+				if (TASK_PREEMPTS_CURR(p, rq))
+					resched_task(rq->curr);
 			}
 			success = 1;
 		}

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