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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-10-24 11:06:12 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-24 12:50:59 +0200 |
| commit | 01c8c57d668d94f1036d9ab11a22aa24ca16a35d (patch) | |
| tree | a5bad4df146982e55bdd9dba73912f6bace036df | |
| parent | 8c82a17e9c924c0e9f13e75e4c2f6bca19a4b516 (diff) | |
sched: fix a find_busiest_group buglet
In one of the group load balancer patches:
commit 408ed066b11cf9ee4536573b4269ee3613bd735e
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri Jun 27 13:41:28 2008 +0200
Subject: sched: hierarchical load vs find_busiest_group
The following change:
- if (max_load - this_load + SCHED_LOAD_SCALE_FUZZ >=
+ if (max_load - this_load + 2*busiest_load_per_task >=
busiest_load_per_task * imbn) {
made the condition always true, because imbn is [1,2].
Therefore, remove the 2*, and give the it a fair chance.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | kernel/sched.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 6625c3c4b10d..12bc367d9241 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3344,7 +3344,7 @@ small_imbalance: } else this_load_per_task = cpu_avg_load_per_task(this_cpu); - if (max_load - this_load + 2*busiest_load_per_task >= + if (max_load - this_load + busiest_load_per_task >= busiest_load_per_task * imbn) { *imbalance = busiest_load_per_task; return busiest; |