From: Carsten Otte <cotte@de.ibm.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: carsteno@de.ibm.com, Jes Sorensen <jes@sgi.com>,
Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, Hugh Dickins <hugh@veritas.com>,
Nick Piggin <nickpiggin@yahoo.com.au>,
bjorn_helgaas@hp.com
Subject: Re: [patch] do_no_pfn handler
Date: Tue, 11 Apr 2006 22:53:09 +0200 [thread overview]
Message-ID: <443C1735.8080600@de.ibm.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0604111318120.10745@g5.osdl.org>
Linus Torvalds wrote:
> Now, the kernel page table accessor macros are certainly generic enough
> that you could have your own "COW bits" macro, and make this all an
> architecture-specific feature (and simply not allow it on architectures
> that don't have a sw-usable COW bit)
>
> It so happens that S390 seems to be one of the very few architectures that
> doesn't have room for that bit in its regular page table layout, and
> that's arguably a design problem for S390. But you _could_ just allocate
> extra memory for page tables, and put the COW bit there. The VM wouldn't
> care - at that point it would fit in the "larger picture" of just having
> the COW information directly in the page tables (even if the "page tables"
> would be partly just sw-defined).
Interresting idea. Sounds more feasible then splitting vmas, I am going to think about it. Thanks!
--
Carsten Otte
IBM Linux technology center
ARCH=s390
next prev parent reply other threads:[~2006-04-11 20:52 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-03 11:32 [patch] do_no_pfn handler Jes Sorensen
2006-04-03 11:46 ` Nick Piggin
2006-04-03 14:49 ` Jes Sorensen
2006-04-04 10:58 ` Jes Sorensen
2006-04-04 11:05 ` Nick Piggin
2006-04-05 9:34 ` Jes Sorensen
2006-04-19 14:10 ` [patch - repost] " Jes Sorensen
2006-04-21 10:41 ` Nick Piggin
2006-04-24 7:55 ` Jes Sorensen
2006-04-11 14:29 ` [patch] " Jes Sorensen
2006-04-11 15:10 ` Linus Torvalds
2006-04-11 15:26 ` Carsten Otte
2006-04-11 15:35 ` Linus Torvalds
2006-04-11 20:03 ` Carsten Otte
2006-04-11 20:30 ` Linus Torvalds
2006-04-11 20:53 ` Carsten Otte [this message]
2006-04-12 9:09 ` Jes Sorensen
2006-04-12 9:16 ` Carsten Otte
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