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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>
This commit is contained in:
Ingo Molnar 2007-07-09 18:51:58 +02:00
parent 425e0968a2
commit 9aa7b36981
1 changed files with 8 additions and 1 deletions
include/linux
sched.h

9
include/linux/sched.h
View File

@ -652,7 +652,14 @@ enum cpu_idle_type {
/* /*
* sched-domains (multiprocessor balancing) declarations: * 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 #ifdef CONFIG_SMP
#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */