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mm: migrate: one less atomic operation

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migrate_page_move_mapping() drops a reference from the old page after
unfreezing its counter.  Both operations can be merged into a single
atomic operation by directly unfreezing to one less reference.

The same applies to migrate_huge_page_move_mapping().

Signed-off-by: Jacobo Giralt <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Johannes Weiner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jacobo Giralt 2012-01-10 15:07:11 -08:00 • committed by Linus Torvalds
commit 937a94c9db
1 changed files with 4 additions and 6 deletions
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10
mm/migrate.c
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@ -269,12 +269,12 @@ static int migrate_page_move_mapping(struct address_space *mapping,
radix_tree_replace_slot(pslot, newpage);
page_unfreeze_refs(page, expected_count);
/*
* Drop cache reference from old page.
* Drop cache reference from old page by unfreezing
* to one less reference.
* We know this isn't the last reference.
*/
__put_page(page);
page_unfreeze_refs(page, expected_count - 1);
/*
* If moved to a different zone then also account
@ -334,9 +334,7 @@ int migrate_huge_page_move_mapping(struct address_space *mapping,
radix_tree_replace_slot(pslot, newpage);
page_unfreeze_refs(page, expected_count);
__put_page(page);
page_unfreeze_refs(page, expected_count - 1);
spin_unlock_irq(&mapping->tree_lock);
return 0;