From: Hiroyuki KAMEZAWA <kamezawa.hiroyu@jp.fujitsu.com>
To: Linux Kernel ML <linux-kernel@vger.kernel.org>
Cc: LHMS <lhms-devel@lists.sourceforge.net>,
linux-mm <linux-mm@kvack.org>,
William Lee Irwin III <wli@holomorphy.com>,
Dave Hansen <haveblue@us.ibm.com>
Subject: [RFC] buddy allocator without bitmap [4/4]
Date: Thu, 26 Aug 2004 21:15:14 +0900 [thread overview]
Message-ID: <412DD452.1090703@jp.fujitsu.com> (raw)
This patch 5th inserts prefetch().
I think These prefetch are reasonable and helpful.
-- Kame
====================================================================
---
linux-2.6.8.1-mm4-kame-kamezawa/mm/page_alloc.c | 2 ++
1 files changed, 2 insertions(+)
diff -puN mm/page_alloc.c~eliminate-bitmap-prefetch mm/page_alloc.c
--- linux-2.6.8.1-mm4-kame/mm/page_alloc.c~eliminate-bitmap-prefetch 2004-08-26 19:32:01.598461736 +0900
+++ linux-2.6.8.1-mm4-kame-kamezawa/mm/page_alloc.c 2004-08-26 19:32:01.602461128 +0900
@@ -257,6 +257,7 @@ static inline void __free_pages_bulk (st
order++;
mask <<= 1;
page_idx &= mask;
+ prefetch(base + (page_idx ^ (1 << order)));
list_del(&buddy->lru);
/* for propriety of PG_private bit, we clear it */
buddy->flags &= ~(1 << PG_private);
@@ -360,6 +361,7 @@ expand(struct zone *zone, struct page *p
area--;
high--;
size >>= 1;
+ prefetch(&page[size >> 1]);
BUG_ON(bad_range(zone, &page[size]));
list_add(&page[size].lru, &area->free_list);
page[size].flags |= (1 << PG_private);
_
--
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next reply other threads:[~2004-08-26 12:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-26 12:15 Hiroyuki KAMEZAWA [this message]
2004-08-26 15:54 ` Dave Hansen
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