linux-kernel - [PATCHv2, RFC 23/30] thp: prepare zap_huge

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Date:	Thu, 14 Mar 2013 19:50:28 +0200
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>
Cc:	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv2, RFC 23/30] thp: prepare zap_huge_pmd() to uncharge file pages

From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>

Uncharge pages from correct counter.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 mm/huge_memory.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index a23da8b..34e0385 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1368,10 +1368,12 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
 			spin_unlock(&tlb->mm->page_table_lock);
 			put_huge_zero_page();
 		} else {
+			int counter;
 			page = pmd_page(orig_pmd);
 			page_remove_rmap(page);
 			VM_BUG_ON(page_mapcount(page) < 0);
-			add_mm_counter(tlb->mm, MM_ANONPAGES, -HPAGE_PMD_NR);
+			counter = PageAnon(page) ? MM_ANONPAGES : MM_FILEPAGES;
+			add_mm_counter(tlb->mm, counter, -HPAGE_PMD_NR);
 			VM_BUG_ON(!PageHead(page));
 			tlb->mm->nr_ptes--;
 			spin_unlock(&tlb->mm->page_table_lock);
-- 
1.7.10.4

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