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mm: numa: Introduce last_nid to the page frame

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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
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@@ -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)];