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[PATCH] Fix boot-time slowdown for measure_migration_cost

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This reduces the amount of time the migration cost calculations cost
during bootup. Based on numbers by Tony Luck <tony.luck@intel.com>.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2006-01-30 20:24:38 +01:00 • committed by Linus Torvalds
parent 7fcdf327be
commit 70b4d63e98
1 changed files with 3 additions and 3 deletions
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6
kernel/sched.c
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@ -5141,7 +5141,7 @@ static void init_sched_build_groups(struct sched_group groups[], cpumask_t span,
#define SEARCH_SCOPE 2 #define SEARCH_SCOPE 2
#define MIN_CACHE_SIZE (64*1024U) #define MIN_CACHE_SIZE (64*1024U)
#define DEFAULT_CACHE_SIZE (5*1024*1024U) #define DEFAULT_CACHE_SIZE (5*1024*1024U)
#define ITERATIONS 2 #define ITERATIONS 1
#define SIZE_THRESH 130 #define SIZE_THRESH 130
#define COST_THRESH 130 #define COST_THRESH 130
@ -5480,9 +5480,9 @@ static unsigned long long measure_migration_cost(int cpu1, int cpu2)
break; break;
} }
/* /*
* Increase the cachesize in 5% steps: * Increase the cachesize in 10% steps:
*/ */
size = size * 20 / 19; size = size * 10 / 9;
} }
if (migration_debug) if (migration_debug)