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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20070824173816.GC16227@bingen.suse.de \
--to=ak@suse.de \
--cc=apw@shadowen.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mel@skynet.ie \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.