From: Mike Kravetz <kravetz@us.ibm.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: jschopp@austin.ibm.com, Mel Gorman <mel@csn.ul.ie>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@osdl.org
Subject: Re: Avoiding external fragmentation with a placement policy Version 12
Date: Wed, 1 Jun 2005 16:47:30 -0700 [thread overview]
Message-ID: <20050601234730.GF3998@w-mikek2.ibm.com> (raw)
In-Reply-To: <429E4023.2010308@yahoo.com.au>
On Thu, Jun 02, 2005 at 09:09:23AM +1000, Nick Piggin wrote:
>
> It adds a lot of complexity to the page allocator and while
> it might be very good, the only improvement we've been shown
> yet is allocating lots of MAX_ORDER allocations I think? (ie.
> not very useful)
>
Allocating lots of MAX_ORDER blocks can be very useful for things
like hot-pluggable memory. I know that this may not be of interest
to most. However, I've been combining Mel's defragmenting patch
with the memory hotplug patch set. As a result, I've been able to
go from 5GB down to 544MB of memory on my ppc64 system via offline
operations. Note that ppc64 only employs a single (DMA) zone. So,
page 'grouping' based on use is coming mainly from Mel's patch.
--
Mike
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next prev parent reply other threads:[~2005-06-01 23:47 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-31 11:20 Mel Gorman
2005-06-01 20:55 ` Joel Schopp
2005-06-01 23:09 ` Nick Piggin
2005-06-01 23:23 ` David S. Miller, Nick Piggin
2005-06-01 23:28 ` Martin J. Bligh
2005-06-01 23:43 ` Nick Piggin
2005-06-02 0:02 ` Martin J. Bligh
2005-06-02 0:20 ` Nick Piggin
2005-06-02 13:55 ` Mel Gorman
2005-06-02 15:52 ` Joel Schopp
2005-06-02 19:50 ` Ray Bryant
2005-06-02 20:10 ` Joel Schopp
2005-06-04 16:09 ` Marcelo Tosatti
2005-06-03 3:48 ` Nick Piggin
2005-06-03 4:49 ` David S. Miller, Nick Piggin
2005-06-03 5:34 ` Martin J. Bligh
2005-06-03 5:37 ` David S. Miller, Martin J. Bligh
2005-06-03 5:42 ` Martin J. Bligh
2005-06-03 5:51 ` David S. Miller, Martin J. Bligh
2005-06-03 13:13 ` Mel Gorman
2005-06-03 6:43 ` Nick Piggin
2005-06-03 13:57 ` Martin J. Bligh
2005-06-03 16:43 ` Dave Hansen
2005-06-03 18:43 ` David S. Miller, Dave Hansen
2005-06-04 1:44 ` Herbert Xu
2005-06-04 2:15 ` Nick Piggin
2005-06-05 19:52 ` David S. Miller, Nick Piggin
2005-06-03 13:05 ` Mel Gorman
2005-06-03 14:00 ` Martin J. Bligh
2005-06-08 17:03 ` Mel Gorman
2005-06-08 17:18 ` Martin J. Bligh
2005-06-10 16:20 ` Christoph Lameter
2005-06-10 17:53 ` Steve Lord
2005-06-02 18:28 ` Andi Kleen
2005-06-02 18:42 ` Martin J. Bligh
2005-06-02 13:15 ` Mel Gorman
2005-06-02 14:01 ` Martin J. Bligh
[not found] ` <20050603174706.GA25663@localhost.localdomain>
2005-06-03 17:56 ` Martin J. Bligh
2005-06-01 23:47 ` Mike Kravetz [this message]
2005-06-01 23:56 ` Nick Piggin
2005-06-02 0:07 ` Mike Kravetz
2005-06-02 9:49 ` Mel Gorman
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