On Fri, Feb 20, 2015 at 06:31:15PM +0100, Jerome Marchand wrote:

On 02/12/2015 05:18 PM, Kirill A. Shutemov wrote:

quoted

With new refcounting all subpages of the compound page are not nessessary
have the same mapcount. We need to take into account mapcount of every
sub-page.

Signed-off-by: Kirill A. Shutemov <redacted>
---
 fs/proc/task_mmu.c | 43 ++++++++++++++++++++++---------------------
 1 file changed, 22 insertions(+), 21 deletions(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 98826d08a11b..8a0a78174cc6 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c

@@ -449,9 +449,10 @@ struct mem_size_stats {
 };
 
 static void smaps_account(struct mem_size_stats *mss, struct page *page,
-		unsigned long size, bool young, bool dirty)
+		bool compound, bool young, bool dirty)
 {
-	int mapcount;
+	int i, nr = compound ? hpage_nr_pages(page) : 1;
+	unsigned long size = 1UL << nr;

Shouldn't that be:
	unsigned long size = nr << PAGE_SHIFT;

Yes, thanks you.

-- 
 Kirill A. Shutemov

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