From: Andi Kleen <ak@suse.de>
To: Mel Gorman <mel@skynet.ie>
Cc: Andi Kleen <ak@suse.de>, Andy Whitcroft <apw@shadowen.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86 Boot NUMA kernels on non-NUMA hardware with DISCONTIG memory model
Date: Fri, 24 Aug 2007 19:38:16 +0200 [thread overview]
Message-ID: <20070824173816.GC16227@bingen.suse.de> (raw)
In-Reply-To: <20070824172626.GE26374@skynet.ie>
> Other than the fact that the memmap must be PMD aligned to use hugepage
> entries for the memmap.
Why is that so? mem_map should be just part of lowmem anyways.
> It could be mapped with small pages in corner cases
> but the complexity worth it?
You don't need to map it with small pages in the normal case,
the only requirement is that c_p_a() is aware of it so it can
split it if needed.
> I can't see this type of lifting being done any time soon. As SPARSEMEM works
> and there is hope with the vmemmap work that DISCONTIG will finally go away,
> it may not be the best investment of time.
It's a trivial change, probably less code than your original patch.
-Andi
next prev parent reply other threads:[~2007-08-24 17:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-24 16:28 [PATCH] x86 Boot NUMA kernels on non-NUMA hardware with DISCONTIG memory model Mel Gorman
2007-08-24 16:35 ` Andi Kleen
2007-08-24 16:52 ` Andy Whitcroft
2007-08-24 17:07 ` Andi Kleen
2007-08-24 17:26 ` Mel Gorman
2007-08-24 17:38 ` Andi Kleen [this message]
2007-08-24 17:44 ` Mel Gorman
2007-08-24 17:53 ` Andi Kleen
2007-08-24 18:02 ` Mel Gorman
2007-08-25 11:09 ` Andy Whitcroft
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