linux-kernel - Re: [PATCH v3] mm: make expand_downwards symmetrical to expand

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Message-ID: <alpine.DEB.2.00.1104211411540.20201@chino.kir.corp.google.com>
Date:	Thu, 21 Apr 2011 14:19:45 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Christoph Lameter <cl@...ux.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Andrew Morton <akpm@...ux-foundation.org>
cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Pekka Enberg <penberg@...nel.org>,
	Michal Hocko <mhocko@...e.cz>, Hugh Dickins <hughd@...gle.com>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
	linux-parisc@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to
 expand_upwards

On Thu, 21 Apr 2011, Christoph Lameter wrote:

> In 32 bit configurations some architectures (like x86) provide nodes
> that have only high memory. Slab allocators only handle normal memory.
> SLAB operates in a kind of degraded mode in that case by falling back for
> each allocation to the nodes that have normal memory.
> 

Let's do this:

 - parisc: James has already queued "parisc: set memory ranges in 
   N_NORMAL_MEMORY when onlined" for 2.6.39, so all he needs now is 
   to merge a hybrid of the Kconfig changes requiring CONFIG_NUMA for 
   CONFIG_DISCONTIGMEM from KOSAKI-san and myself which also fix the 
   compile issues,

 - generic code: we pull check_for_regular_memory() out from under
   CONFIG_HIGHMEM so that N_NORMAL_MEMORY gets set appropriately for 
   all callers of free_area_init_nodes() from paging_init(); this fixes 
   ia64 and mips,

 - alpha, m32r, m68k: push the changes to those individual architectures 
   that I proposed earlier that set N_NORMAL_MEMORY for DISCONTINGMEM
   when memory regions have memory; KOSAKI-san says a couple of these
   architectures may be orphaned so hopefully Andrew can pick them up
   in -mm.

I'll reply to this email with the parisc Kconfig changes for James, the 
generic change to check_for_regular_memory() for Andrew, and the 
arch-specific changes to the appropriate maintainers and email lists (but 
may need to go through -mm if they aren't picked up).
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