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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