linux-kernel - [PATCH 3/6] mm/hugetlb: enable gigantic hugetlb page pools shrinking

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Date:	Thu,  4 Apr 2013 17:09:11 +0800
From:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Michal Hocko <mhocko@...e.cz>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	Hillf Danton <dhillf@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Subject: [PATCH 3/6] mm/hugetlb: enable gigantic hugetlb page pools shrinking

Enable gigantic hugetlb page pools shrinking.

Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
---
 mm/hugetlb.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index eeaf6f2..328f140 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1416,7 +1416,8 @@ static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count,
 {
 	unsigned long min_count, ret;
 
-	if (h->order >= MAX_ORDER)
+	if (h->order >= MAX_ORDER && (!hugetlb_shrink_gigantic_pool ||
+				count > persistent_huge_pages(h)))
 		return h->max_huge_pages;
 
 	/*
@@ -1542,7 +1543,7 @@ static ssize_t nr_hugepages_store_common(bool obey_mempolicy,
 		goto out;
 
 	h = kobj_to_hstate(kobj, &nid);
-	if (h->order >= MAX_ORDER) {
+	if (h->order >= MAX_ORDER && !hugetlb_shrink_gigantic_pool) {
 		err = -EINVAL;
 		goto out;
 	}
@@ -2036,7 +2037,7 @@ static int hugetlb_sysctl_handler_common(bool obey_mempolicy,
 
 	tmp = h->max_huge_pages;
 
-	if (write && h->order >= MAX_ORDER)
+	if (write && h->order >= MAX_ORDER && !hugetlb_shrink_gigantic_pool)
 		return -EINVAL;
 
 	table->data = &tmp;
-- 
1.7.10.4

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