linux-kernel - Re: [PATCH] [4/4] SLAB: Fix node add timer race in cache

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Message-ID: <4B826307.8030805@cs.helsinki.fi>
Date:	Mon, 22 Feb 2010 12:57:11 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Christoph Lameter <cl@...ux-foundation.org>
CC:	Andi Kleen <andi@...stfloor.org>, Nick Piggin <npiggin@...e.de>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	haicheng.li@...el.com, rientjes@...gle.com
Subject: Re: [PATCH] [4/4] SLAB: Fix node add timer race in cache_reap

Christoph Lameter kirjoitti:
> On Mon, 15 Feb 2010, Andi Kleen wrote:
> 
>>> How, may I ask? cpuup_prepare in the hotplug notifier should always
>>> run before start_cpu_timer.
>> I'm not fully sure, but I have the oops to prove it :)
> 
> I still suspect that this has something to do with Pekka's changing the
> boot order for allocator bootstrap. Can we clarify why these problems
> exist before we try band aid?

I don't see how my changes broke things but maybe I'm not looking hard 
enough. Cache reaping is still setup from cpucache_init() which is an 
initcall which is not affected by my changes AFAICT and from 
cpuup_callback() which shoulda also not be affected.

				Pekka
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