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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: Mel Gorman <mgorman@suse.de>
This commit is contained in:
Mel Gorman 2012-11-12 09:06:20 +00:00
parent fb003b80da
commit 57e0a03091
3 changed files with 36 additions and 0 deletions
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30
include/linux/mm.h
View File

@ -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)];

4
include/linux/mm_types.h
View File

@ -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

2
mm/page_alloc.c
View File

@ -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