Commit 64a9a34e authored Jan 21, 2014 by Mel Gorman Committed by Linus Torvalds Jan 21, 2014

mm: numa: do not automatically migrate KSM pages



KSM pages can be shared between tasks that are not necessarily related
to each other from a NUMA perspective.  This patch causes those pages to
be ignored by automatic NUMA balancing so they do not migrate and do not
cause unrelated tasks to be grouped together.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Alex Thorlton <athorlton@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent af1839d7

mm/mprotect.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -23,6 +23,7 @@
		#include <linux/mmu_notifier.h>
		#include <linux/migrate.h>
		#include <linux/perf_event.h>
		#include <linux/ksm.h>
		#include <asm/uaccess.h>
		#include <asm/pgtable.h>
		#include <asm/cacheflush.h>
		@@ -63,7 +64,7 @@ static unsigned long change_pte_range(struct vm_area_struct vma, pmd_t pmd,

		ptent = *pte;
		page = vm_normal_page(vma, addr, oldpte);
		if (page) {
		if (page && !PageKsm(page)) {
		if (!pte_numa(oldpte)) {
		ptent = pte_mknuma(ptent);
		set_pte_at(mm, addr, pte, ptent);