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mm: use refcounts for page_lock_anon_vma()

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Convert page_lock_anon_vma() over to use refcounts.  This is done to
prepare for the conversion of anon_vma from spinlock to mutex.

Sadly this inceases the cost of page_lock_anon_vma() from one to two
atomics, a follow up patch addresses this, lets keep that simple for now.

Signed-off-by: Peter Zijlstra <[email protected]>
Reviewed-by: KAMEZAWA Hiroyuki <[email protected]>
Reviewed-by: KOSAKI Motohiro <[email protected]>
Acked-by: Hugh Dickins <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: David Miller <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Russell King <[email protected]>
Cc: Paul Mundt <[email protected]>
Cc: Jeff Dike <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Namhyung Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Peter Zijlstra 2011-05-24 17:12:10 -07:00 • committed by Linus Torvalds
commit 746b18d421
2 changed files with 31 additions and 28 deletions
Download patch file Download diff file Expand all files Collapse all files

17
mm/migrate.c
View file

@ -721,15 +721,11 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
* Only page_lock_anon_vma() understands the subtleties of
* getting a hold on an anon_vma from outside one of its mms.
*/
anon_vma = page_lock_anon_vma(page);
anon_vma = page_get_anon_vma(page);
if (anon_vma) {
/*
* Take a reference count on the anon_vma if the
* page is mapped so that it is guaranteed to
* exist when the page is remapped later
* Anon page
*/
get_anon_vma(anon_vma);
page_unlock_anon_vma(anon_vma);
} else if (PageSwapCache(page)) {
/*
* We cannot be sure that the anon_vma of an unmapped
@ -857,13 +853,8 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
lock_page(hpage);
}
if (PageAnon(hpage)) {
anon_vma = page_lock_anon_vma(hpage);
if (anon_vma) {
get_anon_vma(anon_vma);
page_unlock_anon_vma(anon_vma);
}
}
if (PageAnon(hpage))
anon_vma = page_get_anon_vma(hpage);
try_to_unmap(hpage, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS);