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Commit 7851a45c authored by Rik van Riel's avatar Rik van Riel Committed by Ingo Molnar
Browse files

mm: numa: Copy cpupid on page migration 



After page migration, the new page has the nidpid unset. This makes
every fault on a recently migrated page look like a first numa fault,
leading to another page migration.

Copying over the nidpid at page migration time should prevent erroneous
migrations of recently migrated pages.

Signed-off-by: default avatarRik van Riel <riel@redhat.com>
Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-46-git-send-email-mgorman@suse.de


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent e29cf08b

mm/migrate.c

+9 −0
Original line number Diff line number Diff line
@@ -443,6 +443,8 @@ int migrate_huge_page_move_mapping(struct address_space *mapping, 
 */

void migrate_page_copy(struct page *newpage, struct page *page)

{

	int cpupid;



	if (PageHuge(page) || PageTransHuge(page))

		copy_huge_page(newpage, page);

	else
@@ -479,6 +481,13 @@ void migrate_page_copy(struct page *newpage, struct page *page) 
			__set_page_dirty_nobuffers(newpage);

 	}



	/*

	 * Copy NUMA information to the new page, to prevent over-eager

	 * future migrations of this same page.

	 */

	cpupid = page_cpupid_xchg_last(page, -1);

	page_cpupid_xchg_last(newpage, cpupid);



	mlock_migrate_page(newpage, page);

	ksm_migrate_page(newpage, page);

	/*