From: David Gibson <dwg@au1.ibm.com>
To: kniht@linux.vnet.ibm.com
Cc: linuxppc-dev <linuxppc-dev@ozlabs.org>,
Linux Memory Management List <linux-mm@kvack.org>
Subject: Re: [PATCH 2/2] powerpc: make 64K huge pages more reliable
Date: Mon, 3 Dec 2007 13:06:48 +1100 [thread overview]
Message-ID: <20071203020648.GF26919@localhost.localdomain> (raw)
In-Reply-To: <474CF694.8040700@us.ibm.com>
On Tue, Nov 27, 2007 at 11:03:16PM -0600, Jon Tollefson wrote:
> This patch adds reliability to the 64K huge page option by making use of
> the PMD for 64K huge pages when base pages are 4k. So instead of a 12
> bit pte it would be 7 bit pmd and a 5 bit pte. The pgd and pud offsets
> would continue as 9 bits and 7 bits respectively. This will allow the
> pgtable to fit in one base page. This patch would have to be applied
> after part 1.
Hrm.. shouldn't we just ban 64K hugepages on a 64K base page size
setup? There's not a whole lot of point to it, after all...
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
next prev parent reply other threads:[~2007-12-03 2:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-28 5:03 [PATCH 2/2] powerpc: make 64K huge pages more reliable Jon Tollefson
2007-12-03 2:06 ` David Gibson [this message]
2007-12-03 21:33 ` Jon Tollefson
2007-12-03 21:51 ` Chris Snook
2007-12-04 0:28 ` David Gibson
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