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Commit 57e0a030 authored by Mel Gorman's avatar Mel Gorman
Browse files

mm: numa: Introduce last_nid to the page frame 



This patch introduces a last_nid field to the page struct. This is used
to build a two-stage filter in the next patch that is aimed at
mitigating a problem whereby pages migrate to the wrong node when
referenced by a process that was running off its home node.

Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
parent fb003b80

include/linux/mm.h

+30 −0
Original line number Diff line number Diff line
@@ -693,6 +693,36 @@ static inline int page_to_nid(const struct page *page) 
}

#endif



#ifdef CONFIG_NUMA_BALANCING

static inline int page_xchg_last_nid(struct page *page, int nid)

{

	return xchg(&page->_last_nid, nid);

}



static inline int page_last_nid(struct page *page)

{

	return page->_last_nid;

}

static inline void reset_page_last_nid(struct page *page)

{

	page->_last_nid = -1;

}

#else

static inline int page_xchg_last_nid(struct page *page, int nid)

{

	return page_to_nid(page);

}



static inline int page_last_nid(struct page *page)

{

	return page_to_nid(page);

}



static inline void reset_page_last_nid(struct page *page)

{

}

#endif



static inline struct zone *page_zone(const struct page *page)

{

	return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];

include/linux/mm_types.h

+4 −0
Original line number Diff line number Diff line
@@ -175,6 +175,10 @@ struct page { 
	 */

	void *shadow;

#endif



#ifdef CONFIG_NUMA_BALANCING

	int _last_nid;

#endif

}

/*

 * The struct page can be forced to be double word aligned so that atomic ops

mm/page_alloc.c

+2 −0
Original line number Diff line number Diff line
@@ -608,6 +608,7 @@ static inline int free_pages_check(struct page *page) 
		bad_page(page);

		return 1;

	}

	reset_page_last_nid(page);

	if (page->flags & PAGE_FLAGS_CHECK_AT_PREP)

		page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP;

	return 0;
@@ -3826,6 +3827,7 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, 
		mminit_verify_page_links(page, zone, nid, pfn);

		init_page_count(page);

		reset_page_mapcount(page);

		reset_page_last_nid(page);

		SetPageReserved(page);

		/*

		 * Mark the block movable so that blocks are reserved for