linux-kernel - [RFC v2 3/3] mm: deactivate lazyfree pages

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Date:	Thu, 20 Mar 2014 15:38:58 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Johannes Weiner <hannes@...xchg.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	John Stultz <john.stultz@...aro.org>, Jason Evans <je@...com>,
	Minchan Kim <minchan@...nel.org>
Subject: [RFC v2 3/3] mm: deactivate lazyfree pages

MADV_FREEed pages should be discarded before working set pages
are reclaimed because most of users(ex, tcmalloc and jemalloc)
have used it instead of MADV_DONTNEED which zap pages instantly.

Signed-off-by: Minchan Kim <minchan@...nel.org>
---
 mm/memory.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/memory.c b/mm/memory.c
index 6f221225f62b..76b683e7d087 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1298,6 +1298,7 @@ static unsigned long lazyfree_pte_range(struct mmu_gather *tlb,
 		ptent = pte_mkclean(ptent);
 		set_pte_at(mm, addr, pte, ptent);
 		tlb_remove_tlb_entry(tlb, pte, addr);
+		deactivate_page(page);
 	} while (pte++, addr += PAGE_SIZE, addr != end);
 	arch_leave_lazy_mmu_mode();
 	pte_unmap_unlock(start_pte, ptl);
-- 
1.9.0

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