From: Nick Piggin <nickpiggin@yahoo.com.au>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: apw@shadowen.org, akpm@osdl.org, mel@csn.ul.ie,
davej@codemonkey.org.uk, tony.luck@intel.com,
linux-kernel@vger.kernel.org, bob.picco@hp.com, ak@suse.de,
linux-mm@kvack.org, linuxppc-dev@ozlabs.org
Subject: Re: [PATCH 5/6] Have ia64 use add_active_range() and free_area_init_nodes
Date: Tue, 16 May 2006 12:11:47 +1000 [thread overview]
Message-ID: <446934E3.5020204@yahoo.com.au> (raw)
In-Reply-To: <20060516103415.ad964bdf.kamezawa.hiroyu@jp.fujitsu.com>
KAMEZAWA Hiroyuki wrote:
>
>Andy's page_zone(page) == page_zone(buddy) check is good, I think.
>
>Making alignment is a difficult problem, I think. It complecates many things.
>We can avoid above check only when memory layout is ideal.
>
>BTW, How about following patch ?
>I don't want to say "Oh, you have to re-compile your kernel with
>CONFIG_UNALIGNED_ZONE on your new machine. you are unlucky." to users.
>
No, this is a function of the architecture code, not the specific
machine it is running on.
So if the architecture ensures alignment and no holes, then they don't
need the overhead of CONFIG_UNALIGNED_ZONE or CONFIG_HOLES_IN_ZONE.
If they do not ensure correct alignment, then they must enable
CONFIG_UNALIGNED_ZONE, even if there may be actual systems which do
result in aligned zones.
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next prev parent reply other threads:[~2006-05-16 2:11 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-08 14:10 [PATCH 0/6] Sizing zones and holes in an architecture independent manner V6 Mel Gorman
2006-05-08 14:10 ` [PATCH 1/6] Introduce mechanism for registering active regions of memory Mel Gorman
2006-05-08 14:11 ` [PATCH 2/6] Have Power use add_active_range() and free_area_init_nodes() Mel Gorman
2006-05-08 14:11 ` [PATCH 3/6] Have x86 use add_active_range() and free_area_init_nodes Mel Gorman
2006-05-08 14:11 ` [PATCH 4/6] Have x86_64 " Mel Gorman
2006-05-20 20:59 ` Andrew Morton
2006-05-20 21:27 ` Andi Kleen
2006-05-20 21:40 ` Andrew Morton
2006-05-20 22:17 ` Andi Kleen
2006-05-20 22:54 ` Andrew Morton
2006-05-21 16:20 ` Mel Gorman
2006-05-21 15:50 ` Mel Gorman
2006-05-21 19:08 ` Andrew Morton
2006-05-21 22:23 ` Mel Gorman
2006-05-23 18:01 ` Mel Gorman
2006-05-08 14:12 ` [PATCH 5/6] Have ia64 " Mel Gorman
2006-05-15 3:31 ` Andrew Morton
2006-05-15 8:21 ` Andy Whitcroft
2006-05-15 10:00 ` Nick Piggin
2006-05-15 10:19 ` Andy Whitcroft
2006-05-15 10:29 ` KAMEZAWA Hiroyuki
2006-05-15 10:47 ` KAMEZAWA Hiroyuki
2006-05-15 11:02 ` Andy Whitcroft
2006-05-16 0:31 ` Nick Piggin
2006-05-16 1:34 ` KAMEZAWA Hiroyuki
2006-05-16 2:11 ` Nick Piggin [this message]
2006-05-15 12:27 ` Mel Gorman
2006-05-15 22:44 ` Mel Gorman
2006-05-19 14:03 ` Mel Gorman
2006-05-19 14:23 ` Andy Whitcroft
2006-05-08 14:12 ` [PATCH 6/6] Break out memory initialisation code from page_alloc.c to mem_init.c Mel Gorman
2006-05-09 1:47 ` Nick Piggin
2006-05-09 8:24 ` Mel Gorman
2006-07-08 11:10 [PATCH 0/6] Sizing zones and holes in an architecture independent manner V8 Mel Gorman
2006-07-08 11:12 ` [PATCH 5/6] Have ia64 use add_active_range() and free_area_init_nodes Mel Gorman
2006-08-21 13:45 [PATCH 0/6] Sizing zones and holes in an architecture independent manner V9 Mel Gorman
2006-08-21 13:46 ` [PATCH 5/6] Have ia64 use add_active_range() and free_area_init_nodes Mel Gorman
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