Date: Wed, 10 Jun 2009 10:59:39 +0200
From: Nick Piggin <npiggin@suse.de>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>,
       Andi Kleen <andi@firstfloor.org>, "riel@redhat.com" <riel@redhat.com>,
       "chris.mason@oracle.com" <chris.mason@oracle.com>,
       "akpm@linux-foundation.org" <akpm@linux-foundation.org>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       "linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [PATCH] [13/16] HWPOISON: The high level memory error handler in the VM v5
Message-ID: <20090610085939.GE31155@wotan.suse.de>
References: <20090603846.816684333@firstfloor.org> <20090603184648.2E2131D028F@basil.firstfloor.org> <20090609100922.GF14820@wotan.suse.de> <Pine.LNX.4.64.0906091637430.13213@sister.anvils> <20090610083803.GE6597@localhost>
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On Wed, Jun 10, 2009 at 04:38:03PM +0800, Wu Fengguang wrote:
> On Wed, Jun 10, 2009 at 12:05:53AM +0800, Hugh Dickins wrote:
> > I think a much more sensible approach would be to follow the page
> > migration technique of replacing the page's ptes by a special swap-like
> > entry, then do the killing from do_swap_page() if a process actually
> > tries to access the page.
> 
> We call that "late kill" and will be enabled when
> sysctl_memory_failure_early_kill=0. Its default value is 1.

What's the use of this? What are the tradeoffs, in what situations
should an admin set this sysctl one way or the other?

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