From: Wei Yang <weiyang@linux.vnet.ibm.com>
To: tj@kernel.org, cl@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Cc: weiyang@linux.vnet.ibm.com
Subject: [PATCH 1/3] percpu: stop the loop when a cpu belongs to a new group
Date: Mon, 21 Oct 2013 16:58:11 +0800 [thread overview]
Message-ID: <1382345893-6644-1-git-send-email-weiyang@linux.vnet.ibm.com> (raw)
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 <weiyang@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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next reply other threads:[~2013-10-21 8:58 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-21 8:58 Wei Yang [this message]
2013-10-21 8:58 ` [PATCH 2/3] percpu: merge two loops when setting up group info Wei Yang
2013-10-27 12:35 ` Tejun Heo
2013-10-28 2:37 ` Wei Yang
2013-10-21 8:58 ` [PATCH 3/3] percpu: little optimization on calculating pcpu_unit_size Wei Yang
2013-10-27 12:36 ` Tejun Heo
2013-10-28 2:43 ` Wei Yang
2013-10-27 12:30 ` [PATCH 1/3] percpu: stop the loop when a cpu belongs to a new group Tejun Heo
2013-10-28 3:00 ` Wei Yang
2013-10-28 11:31 ` Tejun Heo
2013-10-28 15:17 ` Wei Yang
2013-11-20 3:00 ` Wei Yang
2013-11-20 5:51 ` Tejun Heo
2013-11-20 6:58 ` Wei Yang
2013-11-22 23:04 ` Tejun Heo
2013-11-24 1:48 ` Wei Yang
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