linux-kernel - Re: [PATCH] [13/16] HWPOISON: The high level memory error handler in the VM v5

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Message-ID: <20090610085939.GE31155@wotan.suse.de>
Date:	Wed, 10 Jun 2009 10:59:39 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andi Kleen <andi@...stfloor.org>,
	"riel@...hat.com" <riel@...hat.com>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] [13/16] HWPOISON: The high level memory error handler in the VM v5

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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