From 1a44e149084d772a1bcf4cdbdde8a013a8a1cfde Mon Sep 17 00:00:00 2001
From: Andrea Arcangeli <andrea@suse.de>
Date: Sat, 29 Oct 2005 18:16:48 -0700
Subject: [PATCH] [PATCH] .text page fault SMP scalability optimization

We had a problem on ppc64 where with more than 4 threads a large system
wouldn't scale well while faulting in the .text (most of the time was spent
in the kernel despite it was an userland compute intensive app).  The
reason is the useless overwrite of the same pte from all cpu.

I fixed it this way (verified on an older kernel but the forward port is
almost identical).  This will benefit all archs not just ppc64.

Signed-off-by: Andrea Arcangeli <andrea@suse.de>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
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