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

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Message-ID: <CA+55aFyt8euKZv8O-DMY7LE+467a_RQ38YOgF0Xh73+TseM=kQ@mail.gmail.com>
Date:	Tue, 7 Oct 2014 08:45:31 -0400
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>,
	Dave Jones <davej@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Michel Lespinasse <walken@...gle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: pipe/page fault oddness.

On Mon, Oct 6, 2014 at 3:18 PM, Aneesh Kumar K.V
<aneesh.kumar@...ux.vnet.ibm.com> wrote:
>
> Are we still looking at these options ? I could look at implementing the
> first option which will also enable us to free up one pte bit.

We definitely are. If you can test my patch (with the small follow-up
fix), and do the necessary changes for ppc64, that would be good.

I looked quickly at the ppc64 side, and it didn't look too painful.
Using pte_protnone() instead of pte_numa() should remove move lines
than it adds there too..

            Linus
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