linux-kernel - Re: The performance and behaviour of the anti-fragmentation related patches

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Message-ID: <20070302213732.GK10643@holomorphy.com>
Date:	Fri, 2 Mar 2007 13:37:32 -0800
From:	Bill Irwin <bill.irwin@...cle.com>
To:	Joel Schopp <jschopp@...tin.ibm.com>
Cc:	Mel Gorman <mel@....ul.ie>, Bill Irwin <bill.irwin@...cle.com>,
	akpm@...ux-foundation.org, npiggin@...e.de, clameter@...r.sgi.com,
	mingo@...e.hu, arjan@...radead.org, torvalds@...l.org,
	mbligh@...igh.org,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: The performance and behaviour of the anti-fragmentation related patches

At some point in the past, Mel Gorman wrote:
>> I can't think of a workload that totally makes a mess out of list-based. 
>> However, list-based makes no guarantees on availability. If a system 
>> administrator knows they need between 10,000 and 100,000 huge pages and 
>> doesn't want to waste memory pinning too many huge pages at boot-time, 
>> the zone-based mechanism would be what he wanted.

On Fri, Mar 02, 2007 at 10:31:39AM -0600, Joel Schopp wrote:
> From our testing with earlier versions of list based for memory hot-unplug 
> on pSeries machines we were able to hot-unplug huge amounts of memory after 
> running the nastiest workloads we could find for over a week.  Without the 
> patches we were unable to hot-unplug anything within minutes of running the 
> same workloads.
> If something works for 99.999% of people (list based) and there is an easy 
> way to configure it for the other 0.001% of the people ("zone" based) I 
> call that a great solution.  I really don't understand what the resistance 
> is to these patches.

Sorry if I was unclear; I was anticipating others' objections and
offering to assist in responding to them. I myself have no concerns
about the above strategy, apart from generally wanting to recover the
list-based patch's hugepage availability without demanding it as a
merging criterion.


-- wli
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