When a cpu belongs to a new group, there is no cpu has the same group id. This
means it can be assigned a new group id without checking with every others.
This patch does this optimiztion.
Signed-off-by: Wei Yang <weiy...@linux.vnet.ibm.com>
---
mm/percpu.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/mm/percpu.c b/mm/percpu.c
index 8c8e08f..536ca4f 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1488,7 +1488,10 @@ static struct pcpu_alloc_info * __init
pcpu_build_alloc_info(
(cpu_distance_fn(cpu, tcpu) > LOCAL_DISTANCE ||
cpu_distance_fn(tcpu, cpu) > LOCAL_DISTANCE)) {
group++;
- nr_groups = max(nr_groups, group + 1);
+ if (group == nr_groups) {
+ nr_groups++;
+ break;
+ }
goto next_group;
}
}
--
1.7.5.4
--
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