linux-kernel - [PATCH 32/39] autonuma: retain page last

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Date:	Mon, 26 Mar 2012 19:46:19 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: [PATCH 32/39] autonuma: retain page last_nid information in khugepaged

When pages are collapsed try to keep the last_nid information from one
of the original pages.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 mm/huge_memory.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index d388517..76bdc48 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1805,7 +1805,18 @@ static bool __collapse_huge_page_copy(pte_t *pte, struct page *page,
 			clear_user_highpage(page, address);
 			add_mm_counter(vma->vm_mm, MM_ANONPAGES, 1);
 		} else {
+#ifdef CONFIG_AUTONUMA
+			int autonuma_last_nid;
+#endif
 			src_page = pte_page(pteval);
+#ifdef CONFIG_AUTONUMA
+			/* pick the last one, better than nothing */
+			autonuma_last_nid =
+				ACCESS_ONCE(src_page->autonuma_last_nid);
+			if (autonuma_last_nid >= 0)
+				ACCESS_ONCE(page->autonuma_last_nid) =
+					autonuma_last_nid;
+#endif
 			copy_user_highpage(page, src_page, address, vma);
 			VM_BUG_ON(page_mapcount(src_page) != 1);
 			VM_BUG_ON(page_count(src_page) != 2);
--
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