From: Andi Kleen <andi@firstfloor.org>
To: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: Andrew Morton <akpm@linux-foundation.com>,
Andi Kleen <andi@firstfloor.org>,
Wu Fengguang <fengguang.wu@intel.com>,
Izik Eidus <ieidus@redhat.com>, Chris Wright <chrisw@redhat.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Richard Henderson <rth@twiddle.net>,
Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
Ralf Baechle <ralf@linux-mips.org>,
Kyle McMartin <kyle@mcmartin.ca>, Helge Deller <deller@gmx.de>,
Chris Zankel <chris@zankel.net>, Rik van RIel <riel@redhat.com>,
Balbir Singh <balbir@in.ibm.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Avi Kivity <avi@redhat.com>,
Nick Piggin <nickpiggin@yahoo.com.au>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH mmotm] ksm: antidote to MADV_MERGEABLE HWPOISON
Date: Fri, 21 Aug 2009 20:41:12 +0200 [thread overview]
Message-ID: <20090821184112.GB18623@basil.fritz.box> (raw)
In-Reply-To: <Pine.LNX.4.64.0908211912330.14259@sister.anvils>
On Fri, Aug 21, 2009 at 07:30:15PM +0100, Hugh Dickins wrote:
> linux-next is now sporting MADV_HWPOISON at 12, which would have a very
> nasty effect on KSM if you had CONFIG_MEMORY_FAILURE=y with CONFIG_KSM=y.
> Shift MADV_MERGEABLE and MADV_UNMERGEABLE down two - two to reduce the
> confusion if old and new userspace and kernel are mismatched.
>
> Personally I'd prefer the MADV_HWPOISON testing feature to shift; but
> linux-next comes first in the mmotm lineup, and I can't be sure that
> madvise KSM already has more users than there are HWPOISON testers:
> so unless Andi is happy to shift MADV_HWPOISON, mmotm needs this.
Thanks for catching.
Shifting is fine, but I would prefer then if it was to some
value that is not reused (like 100) so that I can probe for it
in the test programs.
-Andi
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next prev parent reply other threads:[~2009-08-21 18:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-21 18:30 Hugh Dickins
2009-08-21 18:41 ` Andi Kleen [this message]
2009-08-21 19:23 ` Hugh Dickins
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