From: Andi Kleen <andi@firstfloor.org>
Date: Wed, 16 Sep 2009 09:50:17 +0000 (+0200)
Subject: HWPOISON: Add madvise() based injector for hardware poisoned pages v4
X-Git-Tag: v2.6.32-rc1~62^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9893e49d64a4874ea67849ee2cfbf3f3d6817573;p=pandora-kernel.git

HWPOISON: Add madvise() based injector for hardware poisoned pages v4

Impact: optional, useful for debugging

Add a new madvice sub command to inject poison for some
pages in a process' address space.  This is useful for
testing the poison page handling.

This patch can allow root to tie up large amounts of memory.
I got feedback from container developers and they didn't see any
problem.

v2: Use write flag for get_user_pages to make sure to always get
a fresh page
v3: Don't request write mapping (Fengguang Wu)
v4: Move MADV_* number to avoid conflict with KSM (Hugh Dickins)

Signed-off-by: Andi Kleen <ak@linux.intel.com>
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