Commit-ID: f0c77b62ba9dd2a4026dc6a653d6da9258d083d8
Gitweb: http://git.kernel.org/tip/f0c77b62ba9dd2a4026dc6a653d6da9258d083d8
Author: Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate: Mon, 10 Dec 2012 12:57:00 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 10 Dec 2012 12:57:00 +0100
sched: Fix NUMA_EXCLUDE_AFFINE check
Mel Gorman reported that the NUMA_EXCLUDE_AFFINE check turned off
NUMA balancing on his box - which has a nr_cpus_allowed 80 but
48 online CPUs.
Fix the test to be num_cpus_possible() - which would also fix
any hotplug variant of the same bug.
Reported-by: Mel Gorman <mgorman@xxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/fair.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 503ec29..9d11a8a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2646,7 +2646,7 @@ static bool task_numa_candidate(struct task_struct *p)
/* Don't disturb hard-bound tasks: */
if (sched_feat(NUMA_EXCLUDE_AFFINE)) {
- if (p->nr_cpus_allowed != num_online_cpus())
+ if (p->nr_cpus_allowed != num_possible_cpus())
return false;
}
--
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