From: Miklos Szeredi <mszeredi@xxxxxxx>
Clean up messy conditional calling of test_clear_page_writeback() from
both rotate_reclaimable_page() and end_page_writeback().
The only user of rotate_reclaimable_page() is end_page_writeback() so
this is OK.
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
---
include/linux/swap.h | 2 +-
mm/filemap.c | 10 ++++++----
mm/swap.c | 37 ++++++++++++-------------------------
3 files changed, 19 insertions(+), 30 deletions(-)
Index: linux/include/linux/swap.h
===================================================================
--- linux.orig/include/linux/swap.h 2008-03-17 18:24:13.000000000 +0100
+++ linux/include/linux/swap.h 2008-03-17 18:25:38.000000000 +0100
@@ -177,7 +177,7 @@ extern void activate_page(struct page *)
extern void mark_page_accessed(struct page *);
extern void lru_add_drain(void);
extern int lru_add_drain_all(void);
-extern int rotate_reclaimable_page(struct page *page);
+extern void rotate_reclaimable_page(struct page *page);
extern void swap_setup(void);
/* linux/mm/vmscan.c */
Index: linux/mm/filemap.c
===================================================================
--- linux.orig/mm/filemap.c 2008-03-17 18:24:13.000000000 +0100
+++ linux/mm/filemap.c 2008-03-17 18:25:38.000000000 +0100
@@ -577,10 +577,12 @@ EXPORT_SYMBOL(unlock_page);
*/
void end_page_writeback(struct page *page)
{
- if (!TestClearPageReclaim(page) || rotate_reclaimable_page(page)) {
- if (!test_clear_page_writeback(page))
- BUG();
- }
+ if (TestClearPageReclaim(page))
+ rotate_reclaimable_page(page);
+
+ if (!test_clear_page_writeback(page))
+ BUG();
+
smp_mb__after_clear_bit();
wake_up_page(page, PG_writeback);
}
Index: linux/mm/swap.c
===================================================================
--- linux.orig/mm/swap.c 2008-03-17 18:24:13.000000000 +0100
+++ linux/mm/swap.c 2008-03-17 18:25:38.000000000 +0100
@@ -133,34 +133,21 @@ static void pagevec_move_tail(struct pag
* Writeback is about to end against a page which has been marked for immediate
* reclaim. If it still appears to be reclaimable, move it to the tail of the
* inactive list.
- *
- * Returns zero if it cleared PG_writeback.
*/
-int rotate_reclaimable_page(struct page *page)
+void rotate_reclaimable_page(struct page *page)
{
- struct pagevec *pvec;
- unsigned long flags;
-
- if (PageLocked(page))
- return 1;
- if (PageDirty(page))
- return 1;
- if (PageActive(page))
- return 1;
- if (!PageLRU(page))
- return 1;
-
- page_cache_get(page);
- local_irq_save(flags);
- pvec = &__get_cpu_var(lru_rotate_pvecs);
- if (!pagevec_add(pvec, page))
- pagevec_move_tail(pvec);
- local_irq_restore(flags);
-
- if (!test_clear_page_writeback(page))
- BUG();
+ if (!PageLocked(page) && !PageDirty(page) && !PageActive(page) &&
+ PageLRU(page)) {
+ struct pagevec *pvec;
+ unsigned long flags;
- return 0;
+ page_cache_get(page);
+ local_irq_save(flags);
+ pvec = &__get_cpu_var(lru_rotate_pvecs);
+ if (!pagevec_add(pvec, page))
+ pagevec_move_tail(pvec);
+ local_irq_restore(flags);
+ }
}
/*
--
--
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