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[PATCH] Direct Migration V9: remove_from_swap() to remove swap ptes

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Add remove_from_swap

remove_from_swap() allows the restoration of the pte entries that existed
before page migration occurred for anonymous pages by walking the reverse
maps.  This reduces swap use and establishes regular pte's without the need
for page faults.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2006-02-01 03:05:39 -08:00 • committed by Linus Torvalds
parent a48d07afdf
commit a3351e525e
5 changed files with 49 additions and 0 deletions
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29
mm/rmap.c
View file

@ -206,6 +206,35 @@ out:
return anon_vma;
}
#ifdef CONFIG_MIGRATION
/*
* Remove an anonymous page from swap replacing the swap pte's
* through real pte's pointing to valid pages and then releasing
* the page from the swap cache.
*
* Must hold page lock on page.
*/
void remove_from_swap(struct page *page)
{
struct anon_vma *anon_vma;
struct vm_area_struct *vma;
if (!PageAnon(page) || !PageSwapCache(page))
return;
anon_vma = page_lock_anon_vma(page);
if (!anon_vma)
return;
list_for_each_entry(vma, &anon_vma->head, anon_vma_node)
remove_vma_swap(vma, page);
spin_unlock(&anon_vma->lock);
delete_from_swap_cache(page);
}
#endif
/*
* At what user virtual address is page expected in vma?
*/