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authorIngo Molnar <mingo@elte.hu>2006-01-30 20:24:38 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-31 10:23:31 -0800
commit70b4d63e98fd93fb9742708a54f872cba24e0fea (patch)
tree016df3fe69c8ca9240d489f846b69674b8746a2d
parent7fcdf327bedfe9cc418af49429d0fc0e48d98de9 (diff)
[PATCH] Fix boot-time slowdown for measure_migration_cost
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>
-rw-r--r--kernel/sched.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 3ee2ae45125..ec7fd9cee30 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5141,7 +5141,7 @@ static void init_sched_build_groups(struct sched_group groups[], cpumask_t span,
#define SEARCH_SCOPE 2
#define MIN_CACHE_SIZE (64*1024U)
#define DEFAULT_CACHE_SIZE (5*1024*1024U)
-#define ITERATIONS 2
+#define ITERATIONS 1
#define SIZE_THRESH 130
#define COST_THRESH 130
@@ -5480,9 +5480,9 @@ static unsigned long long measure_migration_cost(int cpu1, int cpu2)
break;
}
/*
- * Increase the cachesize in 5% steps:
+ * Increase the cachesize in 10% steps:
*/
- size = size * 20 / 19;
+ size = size * 10 / 9;
}
if (migration_debug)