linux-kernel - Re: [RFC v1][PATCH]page_fault retry with NOPAGE

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Message-Id: <20081123102453.f549da39.akpm@linux-foundation.org>
Date:	Sun, 23 Nov 2008 10:24:53 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Ying Han <yinghan@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Mike Waychison <mikew@...gle.com>,
	David Rientjes <rientjes@...gle.com>,
	Rohit Seth <rohitseth@...gle.com>,
	Hugh Dickins <hugh@...itas.com>, Nick Piggin <npiggin@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC v1][PATCH]page_fault retry with NOPAGE_RETRY

On Sun, 23 Nov 2008 10:18:44 +0100 Ingo Molnar <mingo@...e.hu> wrote:

> * Ying Han <yinghan@...gle.com> wrote:
> 
> > page fault retry with NOPAGE_RETRY
> 
> Interesting patch.

<a grey call stirs>

ahhh...  I thought this all sounded familiar.  It surfaced a couple of
years ago, and this was my summary of the intent at the time:

http://lkml.indiana.edu/hypermail/linux/kernel/0609.1/2106.html

It all went round and round for a while, but I don't think anything got
merged.  In fact I can't even find Ben's original little spufs/cell
NOPAGE_RETRY code in the tree, an I thought we merged that.  Confused.

The questions are, of course: does this new code address the issues
which were raised at that time?

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