linux-kernel - Re: [PATCH 00/22] HWPOISON: Intro (v5)

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Date:	Mon, 15 Jun 2009 13:51:43 +0100 (BST)
From:	Hugh Dickins <hugh.dickins@...cali.co.uk>
To:	Wu Fengguang <fengguang.wu@...el.com>
cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Mel Gorman <mel@....ul.ie>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>,
	Andi Kleen <andi@...stfloor.org>,
	"riel@...hat.com" <riel@...hat.com>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 00/22] HWPOISON: Intro (v5)

On Mon, 15 Jun 2009, Wu Fengguang wrote:
> On Mon, Jun 15, 2009 at 11:18:18AM +0800, Balbir Singh wrote:
> > Wu Fengguang wrote:
> > > 
> > > I hope we can reach consensus in this round and then be able to post
> > > a final version for .31 inclusion.
> > 
> > Isn't that too aggressive? .31 is already in the merge window.
> 
> Yes, a bit aggressive. This is a new feature that involves complex logics.
> However it is basically a no-op when there are no memory errors,
> and when memory corruption does occur, it's better to (possibly) panic
> in this code than to panic unconditionally in the absence of this
> feature (as said by Rik).
> 
> So IMHO it's OK for .31 as long as we agree on the user interfaces,
> ie. /proc/sys/vm/memory_failure_early_kill and the hwpoison uevent.
> 
> It comes a long way through numerous reviews, and I believe all the
> important issues and concerns have been addressed. Nick, Rik, Hugh,
> Ingo, ... what are your opinions?

And for how long has this work been in linux-next or mmotm?

My opinion is that it's way too late for .31 - your only chance
is that Linus sometimes gets bored with playing safe, and decides
to break his rules and try something out regardless - but I'd hope
the bootmem business already sated his appetite for danger this time.

Hugh
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