linux-kernel - Re: [PATCH 8/8] Add VM counters for transparent hugepages

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Date:	Thu, 24 Feb 2011 05:18:51 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 8/8] Add VM counters for transparent hugepages

Incremental fix for your patch 8 (I doubt it was intentional).

===
Subject: thp: move THP_SPLIT from __split_huge_page_pmd to inner split_huge_page

From: Andrea Arcangeli <aarcange@...hat.com>

Provide more accurate stats by accounting every split_huge_page not only the
ones coming from pmd manipulations.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 mm/huge_memory.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1393,6 +1393,7 @@ int split_huge_page(struct page *page)
 
 	BUG_ON(!PageSwapBacked(page));
 	__split_huge_page(page, anon_vma);
+	count_vm_event(THP_SPLIT);
 
 	BUG_ON(PageCompound(page));
 out_unlock:
@@ -2287,9 +2288,6 @@ void __split_huge_page_pmd(struct mm_str
 		spin_unlock(&mm->page_table_lock);
 		return;
 	}
-
-	count_vm_event(THP_SPLIT);
-
 	page = pmd_page(*pmd);
 	VM_BUG_ON(!page_count(page));
 	get_page(page);
--
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