Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=60e242393346c1a9a64e7b14dfb7f613a737324f
Commit: 60e242393346c1a9a64e7b14dfb7f613a737324f
Parent: fe443ef2ac421c9c652e251e8733e2479d8e411a
Author: Jeremy Kerr <[EMAIL PROTECTED]>
AuthorDate: Fri Jun 29 10:57:53 2007 +1000
Committer: Paul Mackerras <[EMAIL PROTECTED]>
CommitDate: Tue Jul 3 15:24:44 2007 +1000
[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 <[EMAIL PROTECTED]>
Signed-off-by: Paul Mackerras <[EMAIL PROTECTED]>
---
arch/powerpc/platforms/cell/spufs/sched.c | 8 ++++----
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 1b2916b..6843a01 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) \
-
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