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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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1
include/linux/rmap.h
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@ -92,6 +92,7 @@ static inline void page_dup_rmap(struct page *page)
*/
int page_referenced(struct page *, int is_locked);
int try_to_unmap(struct page *, int ignore_refs);
void remove_from_swap(struct page *page);
/*
* Called from mm/filemap_xip.c to unmap empty zero page