From: Andy Whitcroft <apw@shadowen.org>
To: Mel Gorman <mel@csn.ul.ie>
Cc: Andi Kleen <ak@suse.de>,
linux-mm@kvack.org, mingo@elte.hu,
lhms-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org,
nickpiggin@yahoo.com.au
Subject: Re: [PATCH 2/5] Light Fragmentation Avoidance V20: 002_usemap
Date: Tue, 22 Nov 2005 10:13:28 +0000 [thread overview]
Message-ID: <4382EF48.1050107@shadowen.org> (raw)
In-Reply-To: <Pine.LNX.4.58.0511160200530.8470@skynet>
Mel Gorman wrote:
> That's iterating through, potentially, 1024 pages which I considered too
> expensive. In terms of code complexity, the page-flags patch adds 237
> which is not much of a saving in comparison to 275 that the usemap
> approach uses.
Surley you would just use a single bit in the first page of a MAX_ORDER
block. We guarentee that the mem_map is contigious out to MAX_ORDER
pages so you can simply calculate the offset. The page free path does
the same thing to find the buddy pages when coallescing.
> Again, I can revisit the page-flag approach if I thought that something
> like this would get merged and people would not choke on another page flag
> being consumed.
All of that said, I am not even sure we have a bit left in the page
flags on smaller architectures :/.
-apw
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next prev parent reply other threads:[~2005-11-22 10:13 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-15 16:49 [PATCH 0/5] Light Fragmentation Avoidance V20 Mel Gorman
2005-11-15 16:49 ` [PATCH 1/5] Light Fragmentation Avoidance V20: 001_antidefrag_flags Mel Gorman
2005-11-15 23:00 ` Paul Jackson
2005-11-15 23:04 ` Randy.Dunlap
2005-11-16 1:36 ` Mel Gorman
2005-11-20 14:45 ` [Lhms-devel] " Paul Jackson
2005-11-15 16:49 ` [PATCH 2/5] Light Fragmentation Avoidance V20: 002_usemap Mel Gorman
2005-11-15 23:36 ` Andi Kleen
2005-11-16 1:43 ` Mel Gorman
2005-11-16 1:52 ` Andi Kleen
2005-11-16 2:07 ` Mel Gorman
2005-11-22 10:13 ` Andy Whitcroft [this message]
2005-11-22 10:19 ` Mel Gorman
2005-11-22 10:22 ` Andi Kleen
2005-11-22 10:35 ` Mel Gorman
2005-11-22 10:48 ` KAMEZAWA Hiroyuki
2005-11-22 19:40 ` Mel Gorman
2005-11-22 10:54 ` KAMEZAWA Hiroyuki
2005-11-22 11:10 ` Mel Gorman
2005-11-22 11:35 ` Mel Gorman
2005-11-15 16:50 ` [PATCH 3/5] Light Fragmentation Avoidance V20: 003_fragcore Mel Gorman
2005-11-16 2:35 ` KAMEZAWA Hiroyuki
2005-11-16 10:42 ` Mel Gorman
2005-11-15 16:50 ` [PATCH 4/5] Light Fragmentation Avoidance V20: 004_percpu Mel Gorman
2005-11-15 23:24 ` Paul Jackson
2005-11-16 1:37 ` Mel Gorman
2005-11-15 16:50 ` [PATCH 5/5] Light Fragmentation Avoidance V20: 005_configurable Mel Gorman
2005-11-15 23:39 ` Andi Kleen
2005-11-16 1:47 ` Mel Gorman
2005-11-15 22:54 ` [PATCH 0/5] Light Fragmentation Avoidance V20 Paul Jackson
2005-11-16 1:34 ` Mel Gorman
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