From: Nick Piggin <nickpiggin@yahoo.com.au>
To: linux-mm@kvack.org, 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: Sun, 8 Jan 2006 00:21:52 -0500 [thread overview]
Message-ID: <20060108052531.2996.20958.sendpatchset@didi.local0.net> (raw)
In-Reply-To: <20060108052307.2996.39444.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
@@ -247,10 +247,12 @@ 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
@@ -186,7 +186,7 @@ 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);
}
@@ -231,7 +231,7 @@ 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--;
Send instant messages to your online friends http://au.messenger.yahoo.com
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2006-01-08 5:21 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-08 5:19 [patch 0/4] mm: de-skew page_count Nick Piggin
2006-01-08 5:20 ` [patch 1/4] mm: page refcount use atomic primitives Nick Piggin
2006-01-08 5:54 ` Andrew Morton
2006-01-08 20:40 ` Nick Piggin
2006-01-08 21:43 ` Andrew Morton
2006-01-08 5:20 ` [patch 2/4] mm: PageLRU no testset Nick Piggin
2006-01-08 5:21 ` [patch 3/4] mm: PageActive " Nick Piggin
2006-01-08 5:21 ` Nick Piggin [this message]
2006-01-08 5:42 ` [patch 0/4] mm: de-skew page_count 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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20060108052531.2996.20958.sendpatchset@didi.local0.net \
--to=nickpiggin@yahoo.com.au \
--cc=akpm@osdl.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox