linux-kernel - [PATCH 08/18] mm, hugetlb: do hugepage_subpool_get_pages() when avoid

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Date:	Mon, 29 Jul 2013 14:31:59 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Michal Hocko <mhocko@...e.cz>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	David Gibson <david@...son.dropbear.id.au>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Hillf Danton <dhillf@...il.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH 08/18] mm, hugetlb: do hugepage_subpool_get_pages() when avoid_reserve

When we try to get a huge page with avoid_reserve, we don't consume
a reserved page. So it is treated like as non-reserve case.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 1426c03..749629e 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1149,12 +1149,13 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
 	if (has_reserve < 0)
 		return ERR_PTR(-ENOMEM);
 
-	if (!has_reserve && (hugepage_subpool_get_pages(spool, 1) < 0))
+	if ((!has_reserve || avoid_reserve)
+		&& (hugepage_subpool_get_pages(spool, 1) < 0))
 			return ERR_PTR(-ENOSPC);
 
 	ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg);
 	if (ret) {
-		if (!has_reserve)
+		if (!has_reserve || avoid_reserve)
 			hugepage_subpool_put_pages(spool, 1);
 		return ERR_PTR(-ENOSPC);
 	}
@@ -1167,7 +1168,7 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
 			hugetlb_cgroup_uncharge_cgroup(idx,
 						       pages_per_huge_page(h),
 						       h_cg);
-			if (!has_reserve)
+			if (!has_reserve || avoid_reserve)
 				hugepage_subpool_put_pages(spool, 1);
 			return ERR_PTR(-ENOSPC);
 		}
-- 
1.7.9.5

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