From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 30 Jan 2006 19:24:38 +0000 (+0100)
Subject: [PATCH] Fix boot-time slowdown for measure_migration_cost
X-Git-Tag: v2.6.16-rc2~251
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=70b4d63e98fd93fb9742708a54f872cba24e0fea;p=linux-2.6

[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>
---

diff --git a/kernel/sched.c b/kernel/sched.c
index 3ee2ae4512..ec7fd9cee3 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)