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authorJeremy Kerr <jk@ozlabs.org>2007-06-29 10:57:53 +1000
committerPaul Mackerras <paulus@samba.org>2007-07-03 15:24:44 +1000
commit60e242393346c1a9a64e7b14dfb7f613a737324f (patch)
tree79987a1ff1f9406251a5967c0aa6820b73637281
parentfe443ef2ac421c9c652e251e8733e2479d8e411a (diff)
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[POWERPC] spusched: Fix timeslice calculations
The current timeslice code mixes 'jiffies' up with 'spesched ticks'. This change correctly defines the number of time slices each SPE contexts is given, and clarifies the comment. This brings the default timeslice for SPE contexts into a reasonable range. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
-rw-r--r--arch/powerpc/platforms/cell/spufs/sched.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/powerpc/platforms/cell/spufs/sched.c b/arch/powerpc/platforms/cell/spufs/sched.c
index 1b2916bdc1c8..6843a01b1a25 100644
--- a/arch/powerpc/platforms/cell/spufs/sched.c
+++ b/arch/powerpc/platforms/cell/spufs/sched.c
@@ -70,11 +70,11 @@ static struct timer_list spusched_timer;
/*
* These are the 'tuning knobs' of the scheduler:
*
- * Minimum timeslice is 5 msecs (or 10 jiffies, whichever is larger),
- * default timeslice is 100 msecs, maximum timeslice is 800 msecs.
+ * Minimum timeslice is 5 msecs (or 1 spu scheduler tick, whichever is
+ * larger), default timeslice is 100 msecs, maximum timeslice is 800 msecs.
*/
-#define MIN_SPU_TIMESLICE max(5 * HZ / 100, 10)
-#define DEF_SPU_TIMESLICE (100 * HZ / 100)
+#define MIN_SPU_TIMESLICE max(5 * HZ / (1000 * SPUSCHED_TICK), 1)
+#define DEF_SPU_TIMESLICE (100 * HZ / (1000 * SPUSCHED_TICK))
#define MAX_USER_PRIO (MAX_PRIO - MAX_RT_PRIO)
#define SCALE_PRIO(x, prio) \