linux-kernel - Re: pipe/page fault oddness.

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Message-ID: <542C39E0.8030609@redhat.com>
Date:	Wed, 01 Oct 2014 13:29:04 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>
CC:	Dave Jones <davej@...hat.com>, Al Viro <viro@...iv.linux.org.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Michel Lespinasse <walken@...gle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>,
	Sasha Levin <sasha.levin@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: pipe/page fault oddness.

On 10/01/2014 12:18 PM, Linus Torvalds wrote:

> Seriously, why can't we just do this, and throw away all the crap that
> is "numa special case". This would make all the random games in
> change_pte_range() just go away entirely, because the whole NUMA thing
> really wouldn't be a special case for the pte AT ALL any more. All it
> would be is that a pte could be marked PROT_NONE even if the
> vma->vm_flags aren't.

That's what I suggested quite a while back, but IIRC either
Peter or Mel brought up a reason why this was not possible.

Unfortunately I do not remember what it was, just that I
was convinced by it at the time...
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