[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>

1 files changed, 3 insertions, 3 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 3ee2ae45125f..ec7fd9cee306 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)