From: Ingo Molnar <mingo@elte.hu>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Hugh Dickins <hugh@veritas.com>,
William Lee Irwin III <wli@movementarian.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>
Subject: Re: pud_bad vs pud_bad
Date: Thu, 5 Feb 2009 22:50:50 +0100 [thread overview]
Message-ID: <20090205215050.GB28097@elte.hu> (raw)
In-Reply-To: <498B54A0.7040005@goop.org>
* Jeremy Fitzhardinge <jeremy@goop.org> wrote:
>> I sincerely hope 0! I shed no tears at losing support for NUMAQ, but why
>> should we be forced to double all the 32-bit ptes? You want us all to be
>> using NX? Or you just want to cut your test/edit matrix - that I can
>> well understand!
>
> Yes, that's the gist of it. We could simplify things by having only one
> pte format and only have to parameterise with 3/4 level pagetables. We'd
> lose support for non-PAE cpus, including the first Pentium M (which is
> probably still in fairly wide use, unfortunately).
We'd also lose a fair bit of performance (not to mention the pagetable
footprint doubling that Hugh already mentioned) on 32-bit PAE capable
systems that dont actually have RAM above 4G physical.
Bad idea really ...
Ingo
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next prev parent reply other threads:[~2009-02-05 21:51 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-05 18:23 Jeremy Fitzhardinge
2009-02-05 18:43 ` Ingo Molnar
2009-02-05 18:54 ` Jeremy Fitzhardinge
2009-02-05 19:10 ` Ingo Molnar
2009-02-05 19:26 ` Jeremy Fitzhardinge
2009-02-05 19:31 ` Ingo Molnar
2009-02-05 19:38 ` Hugh Dickins
2009-02-05 19:49 ` Ingo Molnar
2009-02-05 19:58 ` wli
2009-02-05 20:14 ` Hugh Dickins
2009-02-05 20:56 ` wli
2009-02-05 21:09 ` Hugh Dickins
2009-02-05 20:12 ` Hugh Dickins
2009-02-05 20:42 ` Jeremy Fitzhardinge
2009-02-05 20:51 ` Hugh Dickins
2009-02-05 21:05 ` Jeremy Fitzhardinge
2009-02-05 21:50 ` Ingo Molnar [this message]
2009-02-05 22:07 ` Jeremy Fitzhardinge
2009-02-05 23:42 ` Ingo Molnar
2009-02-06 0:08 ` Jeremy Fitzhardinge
2009-02-06 0:50 ` Ingo Molnar
2009-02-05 20:57 ` Ingo Molnar
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