[Patch] task interactivity calculation (was Strange interactivitybehaviour)

[Martin Andersson]

The appended patch fixes the problem mentioned in 
http://lkml.org/lkml/2006/2/27/104
regarding wrong truncations in the calculation of task interactivity 
when the nice value is negative. The problem causes the interactivity to 
scale nonlinearly and differ from examples in the code.

/Martin Andersson

diff -uprN linux-2.6.15.4.orig/kernel/sched.c linux-2.6.15.4/kernel/sched.c
--- linux-2.6.15.4.orig/kernel/sched.c	2006-02-10 08:22:48.000000000 +0100
+++ linux-2.6.15.4/kernel/sched.c	2006-02-28 11:10:30.000000000 +0100
@@ -142,7 +142,7 @@
 	(v1) * (v2_max) / (v1_max)

 #define DELTA(p) \
-	(SCALE(TASK_NICE(p), 40, MAX_BONUS) + INTERACTIVE_DELTA)
+	(SCALE(TASK_NICE(p)+20,40, MAX_BONUS)-20*MAX_BONUS/40+INTERACTIVE_DELTA)

 #define TASK_INTERACTIVE(p) \
 	((p)->prio <= (p)->static_prio - DELTA(p))
-
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