sched: increase the resolution of smpnice

increase SMP-nice's resolution. This is needed by CFS to
implement SCHED_IDLE and cleaned up nice level support.

no behavioral changes.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 8 insertions, 1 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 61a111fe2b7a..d5084e7c48cf 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -652,7 +652,14 @@ enum cpu_idle_type {
 /*
  * sched-domains (multiprocessor balancing) declarations:
  */
-#define SCHED_LOAD_SCALE        128UL   /* increase resolution of load */
+
+/*
+ * Increase resolution of nice-level calculations:
+ */
+#define SCHED_LOAD_SHIFT        10
+#define SCHED_LOAD_SCALE        (1L << SCHED_LOAD_SHIFT)
+
+#define SCHED_LOAD_SCALE_FUZZ   (SCHED_LOAD_SCALE >> 5)
 
 #ifdef CONFIG_SMP
 #define SD_LOAD_BALANCE         1       /* Do load balancing on this domain. */