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mm: numa: Add THP migration for the NUMA working set scanning fault case.

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Note: This is very heavily based on a patch from Peter Zijlstra with
	fixes from Ingo Molnar, Hugh Dickins and Johannes Weiner.  That patch
	put a lot of migration logic into mm/huge_memory.c where it does
	not belong. This version puts tries to share some of the migration
	logic with migrate_misplaced_page.  However, it should be noted
	that now migrate.c is doing more with the pagetable manipulation
	than is preferred. The end result is barely recognisable so as
	before, the signed-offs had to be removed but will be re-added if
	the original authors are ok with it.

Add THP migration for the NUMA working set scanning fault case.

It uses the page lock to serialize. No migration pte dance is
necessary because the pte is already unmapped when we decide
to migrate.

[[email protected]: Fix memory leak on isolation failure]
[[email protected]: Fix transfer of last_nid information]
Signed-off-by: Mel Gorman <[email protected]>
This commit is contained in:
Mel Gorman 2012-11-19 12:35:47 +00:00
commit b32967ff10
5 changed files with 255 additions and 64 deletions
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7
mm/internal.h
View file

@ -212,15 +212,18 @@ static inline void mlock_migrate_page(struct page *newpage, struct page *page)
{
if (TestClearPageMlocked(page)) {
unsigned long flags;
int nr_pages = hpage_nr_pages(page);
local_irq_save(flags);
__dec_zone_page_state(page, NR_MLOCK);
__mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
SetPageMlocked(newpage);
__inc_zone_page_state(newpage, NR_MLOCK);
__mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
local_irq_restore(flags);
}
}
extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
extern unsigned long vma_address(struct page *page,
struct vm_area_struct *vma);