Commit 0255d491 authored Oct 07, 2013 by Mel Gorman Committed by Ingo Molnar Oct 29, 2013

mm: Account for a THP NUMA hinting update as one PTE update



A THP PMD update is accounted for as 512 pages updated in vmstat.  This is
large difference when estimating the cost of automatic NUMA balancing and
can be misleading when comparing results that had collapsed versus split
THP. This patch addresses the accounting issue.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: <stable@kernel.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-10-git-send-email-mgorman@suse.de


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 3f926ab9

mm/mprotect.c

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -148,7 +148,7 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
	split_huge_page_pmd(vma, addr, pmd);		split_huge_page_pmd(vma, addr, pmd);
	else if (change_huge_pmd(vma, pmd, addr, newprot,		else if (change_huge_pmd(vma, pmd, addr, newprot,
	prot_numa)) {		prot_numa)) {
	pages += HPAGE_PMD_NR;		pages++;
	continue;		continue;
	}		}
	/* fall through */		/* fall through */

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