[PATCH] mm: fix the incorrect hugepages count

From	zhongjiang <zhongjiang@huawei.com>
Newsgroups	linux.kernel
Subject	[PATCH] mm: fix the incorrect hugepages count
Date	2016-08-08 05:00 +0200
Message-ID	<s3IXg-3Tl-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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From: zhong jiang <zhongjiang@huawei.com>

when memory hotplug enable, free hugepages will be freed if movable node offline.
therefore, /proc/sys/vm/nr_hugepages will be incorrect.

The patch fix it by reduce the max_huge_pages when the node offline.

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
---
 mm/hugetlb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f904246..3356e3a 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1448,6 +1448,7 @@ static void dissolve_free_huge_page(struct page *page)
 		list_del(&page->lru);
 		h->free_huge_pages--;
 		h->free_huge_pages_node[nid]--;
+		h->max_huge_pages--;
 		update_and_free_page(h, page);
 	}
 	spin_unlock(&hugetlb_lock);
-- 
1.8.3.1

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[PATCH] mm: fix the incorrect hugepages count zhongjiang <zhongjiang@huawei.com> - 2016-08-08 05:00 +0200
  Re: [PATCH] mm: fix the incorrect hugepages count Mike Kravetz <mike.kravetz@oracle.com> - 2016-08-08 19:20 +0200
    Re: [PATCH] mm: fix the incorrect hugepages count zhong jiang <zhongjiang@huawei.com> - 2016-08-09 12:40 +0200
      Re: [PATCH] mm: fix the incorrect hugepages count Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2016-08-10 02:20 +0200

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