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Commit 70b4d63e authored by Ingo Molnar's avatar Ingo Molnar Committed by Linus Torvalds
Browse files

[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: default avatarIngo Molnar <mingo@elte.hu>
parent 7fcdf327

kernel/sched.c

+3 −3
Original line number Diff line number Diff line
@@ -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)