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authorIngo Molnar <mingo@elte.hu>2006-02-17 16:52:44 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-17 16:59:26 -0500
commit4bbf39c29bc3409d6454faf0dfa1b3b0aa2ac2af (patch)
tree2f8ed8aa42a1645a9cb3306ce93c9e4b63536630 /kernel
parent05efc67d100ff6c3364604b72729addf1a86fdab (diff)
[PATCH] Introduce CONFIG_DEFAULT_MIGRATION_COST
Heiko Carstens <heiko.carstens@de.ibm.com> wrote: The boot sequence on s390 sometimes takes ages and we spend a very long time (up to one or two minutes) in calibrate_migration_costs. The time spent there differs from boot to boot. Also the calculated costs differ a lot. I've seen differences by up to a factor of 15 (yes, factor not percent). Also I doubt that making these measurements make much sense on a completely virtualized architecture where you cannot tell how much cpu time you will get anyway. So introduce the CONFIG_DEFAULT_MIGRATION_COST method for an architecture to set the scheduler migration costs. This turns off automatic detection of migration costs. Makes sense on virtual platforms, where migration costs are hard to measure accurately. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 66d957227de9..12d291bf3379 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5058,7 +5058,18 @@ static void init_sched_build_groups(struct sched_group groups[], cpumask_t span,
5058#define MAX_DOMAIN_DISTANCE 32 5058#define MAX_DOMAIN_DISTANCE 32
5059 5059
5060static unsigned long long migration_cost[MAX_DOMAIN_DISTANCE] = 5060static unsigned long long migration_cost[MAX_DOMAIN_DISTANCE] =
5061 { [ 0 ... MAX_DOMAIN_DISTANCE-1 ] = -1LL }; 5061 { [ 0 ... MAX_DOMAIN_DISTANCE-1 ] =
5062/*
5063 * Architectures may override the migration cost and thus avoid
5064 * boot-time calibration. Unit is nanoseconds. Mostly useful for
5065 * virtualized hardware:
5066 */
5067#ifdef CONFIG_DEFAULT_MIGRATION_COST
5068 CONFIG_DEFAULT_MIGRATION_COST
5069#else
5070 -1LL
5071#endif
5072};
5062 5073
5063/* 5074/*
5064 * Allow override of migration cost - in units of microseconds. 5075 * Allow override of migration cost - in units of microseconds.