linux-kernel - [PATCH 03/16] mm: numa: Account for THP numa hinting faults on the correct node

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Date:	Thu, 11 Jul 2013 10:46:47 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, Mel Gorman <mgorman@...e.de>
Subject: [PATCH 03/16] mm: numa: Account for THP numa hinting faults on the correct node

THP NUMA hinting fault on pages that are not migrated are being
accounted for incorrectly. Currently the fault will be counted as if the
task was running on a node local to the page which is not necessarily
true.

Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 mm/huge_memory.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index e2f7f5aa..e4a79fa 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1293,7 +1293,7 @@ int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
 	struct page *page;
 	unsigned long haddr = addr & HPAGE_PMD_MASK;
 	int target_nid;
-	int current_nid = -1;
+	int src_nid = -1;
 	bool migrated;
 
 	spin_lock(&mm->page_table_lock);
@@ -1302,9 +1302,9 @@ int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
 
 	page = pmd_page(pmd);
 	get_page(page);
-	current_nid = page_to_nid(page);
+	src_nid = numa_node_id();
 	count_vm_numa_event(NUMA_HINT_FAULTS);
-	if (current_nid == numa_node_id())
+	if (src_nid == page_to_nid(page))
 		count_vm_numa_event(NUMA_HINT_FAULTS_LOCAL);
 
 	target_nid = mpol_misplaced(page, vma, haddr);
@@ -1346,8 +1346,8 @@ clear_pmdnuma:
 	update_mmu_cache_pmd(vma, addr, pmdp);
 out_unlock:
 	spin_unlock(&mm->page_table_lock);
-	if (current_nid != -1)
-		task_numa_fault(current_nid, HPAGE_PMD_NR, false);
+	if (src_nid != -1)
+		task_numa_fault(src_nid, HPAGE_PMD_NR, false);
 	return 0;
 }
 
-- 
1.8.1.4

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