linux-kernel - Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig

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Date:	Wed, 9 Aug 2006 10:58:54 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	Andi Kleen <ak@...e.de>, Paul Mackerras <paulus@...ba.org>,
	Andrew Morton <akpm@...l.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Randy.Dunlap" <rdunlap@...otime.net>,
	"Protasevich, Natalie" <Natalie.Protasevich@...sys.com>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig

On Tue, Aug 08, 2006 at 10:17:53AM +0200, Martin Schwidefsky wrote:
> "vmalloc reserve first; allocate pages later" would be a really nice
> feature. We could use this on s390 to implement the virtual mem_map
> array spanning the whole 64 bit address range (with holes in it). To
> make it perfect a "deallocate pages; keep vmalloc reserve" should be
> added, then we could free parts of the mem_map array again on hot memory
> remove. 

IA-64 already has some arch. specific code to allocate a sparse
virtual memory map ... having generic code to do so would be
nice, but I foresee some chicken&egg problems in getting enough
of the vmalloc/vmap framework up & running before mem_map[] has
been allocated.

That and the hotplug memory folks don't like the virtual mem_map
code and have spurned it in favour of SPARSE.

-Tony
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