From: Nick Piggin <nickpiggin@yahoo.com.au>
To: linux-kernel@vger.kernel.org
Cc: Nick Piggin <nickpiggin@yahoo.com.au>, Andrew Morton <akpm@osdl.org>
Subject: [patch 4/4] mm: less atomic ops
Date: Mon, 5 Dec 2005 07:01:00 -0500 [thread overview]
Message-ID: <20051205120029.3480.23573.sendpatchset@didi.local0.net> (raw)
In-Reply-To: <20051205115901.3480.60596.sendpatchset@didi.local0.net>
In the page release paths, we can be sure that nobody will mess with our
page->flags because the refcount has dropped to 0. So no need for atomic
operations here.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Index: linux-2.6/include/linux/page-flags.h
===================================================================
--- linux-2.6.orig/include/linux/page-flags.h
+++ linux-2.6/include/linux/page-flags.h
@@ -236,10 +236,12 @@ extern void __mod_page_state_offset(unsi
#define PageLRU(page) test_bit(PG_lru, &(page)->flags)
#define SetPageLRU(page) set_bit(PG_lru, &(page)->flags)
#define ClearPageLRU(page) clear_bit(PG_lru, &(page)->flags)
+#define __ClearPageLRU(page) __clear_bit(PG_lru, &(page)->flags)
#define PageActive(page) test_bit(PG_active, &(page)->flags)
#define SetPageActive(page) set_bit(PG_active, &(page)->flags)
#define ClearPageActive(page) clear_bit(PG_active, &(page)->flags)
+#define __ClearPageActive(page) __clear_bit(PG_active, &(page)->flags)
#define PageSlab(page) test_bit(PG_slab, &(page)->flags)
#define SetPageSlab(page) set_bit(PG_slab, &(page)->flags)
Index: linux-2.6/mm/swap.c
===================================================================
--- linux-2.6.orig/mm/swap.c
+++ linux-2.6/mm/swap.c
@@ -180,7 +180,7 @@ void fastcall __page_cache_release(struc
struct zone *zone = page_zone(page);
spin_lock_irqsave(&zone->lru_lock, flags);
BUG_ON(!PageLRU(page));
- ClearPageLRU(page);
+ __ClearPageLRU(page);
del_page_from_lru(zone, page);
spin_unlock_irqrestore(&zone->lru_lock, flags);
}
@@ -225,7 +225,7 @@ void release_pages(struct page **pages,
spin_lock_irq(&zone->lru_lock);
}
BUG_ON(!PageLRU(page));
- ClearPageLRU(page);
+ __ClearPageLRU(page);
del_page_from_lru(zone, page);
}
BUG_ON(page_count(page));
Index: linux-2.6/include/linux/mm_inline.h
===================================================================
--- linux-2.6.orig/include/linux/mm_inline.h
+++ linux-2.6/include/linux/mm_inline.h
@@ -32,7 +32,7 @@ del_page_from_lru(struct zone *zone, str
{
list_del(&page->lru);
if (PageActive(page)) {
- ClearPageActive(page);
+ __ClearPageActive(page);
zone->nr_active--;
} else {
zone->nr_inactive--;
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next prev parent reply other threads:[~2005-12-05 12:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-05 11:59 [patch 0/4] mm: optimisations Nick Piggin
2005-12-05 11:59 ` [patch 2/4] mm: PageLRU no testset Nick Piggin
2005-12-05 12:00 ` [patch 3/4] mm: PageActive " Nick Piggin
2005-12-05 12:01 ` Nick Piggin [this message]
2005-12-05 20:43 ` [patch 1/4] mm: page refcount use atomic primitives Nick Piggin
-- strict thread matches above, loose matches on Subject: below --
2006-01-08 5:23 [patch 0/4] mm: de-skew page_count Nick Piggin
2006-01-08 5:25 ` [patch 4/4] mm: less atomic ops Nick Piggin
2006-01-18 10:40 [patch 0/4] mm: de-skew page refcount Nick Piggin
2006-01-18 10:41 ` [patch 4/4] mm: less atomic ops Nick Piggin
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