From: Ralf Baechle <ralf@linux-mips.org>
To: Peter Watkins <treestem@gmail.com>
Cc: linux-mips@linux-mips.org
Subject: Re: [PATCH] 64K page size
Date: Tue, 29 Aug 2006 14:50:55 +0100 [thread overview]
Message-ID: <20060829135055.GB29289@linux-mips.org> (raw)
In-Reply-To: <44EC7125.7000000@gmail.com>
On Wed, Aug 23, 2006 at 11:15:49AM -0400, Peter Watkins wrote:
> There are a number of changes required to support larger page sizes, but
> this one I thought worth sending up right away.
>
> The code in pgtable-64.h assumes TASK_SIZE is always bigger than a first
> level PGDIR_SIZE. This is not the case for 64K pages, where task size is
> 40 bits (1TB) and a pgd entry can map 42 bits. This leads to
> USER_PTRS_PER_PGD being zero for 64K pages.
Do you actually need large address space? The kernel could allow 2, 3 and
4-level pagetables easily but doesn't give that choice currently.
Ralf
next prev parent reply other threads:[~2006-08-29 13:50 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-23 15:15 [PATCH] 64K page size Peter Watkins
2006-08-23 16:00 ` Thiemo Seufer
2006-08-23 16:23 ` Jonathan Day
2006-08-23 17:53 ` Thiemo Seufer
2006-08-25 0:28 ` Ralf Baechle
2006-08-25 5:11 ` Jonathan Day
2006-08-29 14:07 ` Ralf Baechle
2006-08-31 3:48 ` Yoichi Yuasa
2006-08-31 21:24 ` Ralf Baechle
2006-08-29 13:50 ` Ralf Baechle [this message]
2006-08-31 15:12 ` Peter Watkins
2006-08-29 14:01 ` Ralf Baechle
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