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
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=443C1735.8080600@de.ibm.com \
--to=cotte@de.ibm.com \
--cc=akpm@osdl.org \
--cc=bjorn_helgaas@hp.com \
--cc=carsteno@de.ibm.com \
--cc=hugh@veritas.com \
--cc=jes@sgi.com \
--cc=linux-kernel@vger.kernel.org \
--cc=nickpiggin@yahoo.com.au \
--cc=torvalds@osdl.org \
/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.