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authorIngo Molnar <mingo@elte.hu>2007-07-09 20:51:57 +0400
committerIngo Molnar <mingo@elte.hu>2007-07-09 20:51:57 +0400
commit0437e109e1841607f2988891eaa36c531c6aa6ac (patch)
treee9d8f170786f7e33d4c5829cb008cf38d42a2014 /include/linux/sched.h
parent0e6aca43e08a62a48d6770e9a159dbec167bf4c6 (diff)
downloadlinux-0437e109e1841607f2988891eaa36c531c6aa6ac.tar.xz
sched: zap the migration init / cache-hot balancing code
the SMP load-balancer uses the boot-time migration-cost estimation code to attempt to improve the quality of balancing. The reason for this code is that the discrete priority queues do not preserve the order of scheduling accurately, so the load-balancer skips tasks that were running on a CPU 'recently'. this code is fundamental fragile: the boot-time migration cost detector doesnt really work on systems that had large L3 caches, it caused boot delays on large systems and the whole cache-hot concept made the balancing code pretty undeterministic as well. (and hey, i wrote most of it, so i can say it out loud that it sucks ;-) under CFS the same purpose of cache affinity can be achieved without any special cache-hot special-case: tasks are sorted in the 'timeline' tree and the SMP balancer picks tasks from the left side of the tree, thus the most cache-cold task is balanced automatically. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h6
1 files changed, 0 insertions, 6 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 7e74262f98e1..8764cda0feca 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -754,12 +754,6 @@ struct sched_domain {
extern int partition_sched_domains(cpumask_t *partition1,
cpumask_t *partition2);
-/*
- * Maximum cache size the migration-costs auto-tuning code will
- * search from:
- */
-extern unsigned int max_cache_size;
-
#endif /* CONFIG_SMP */