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Date: Thu, 5 Aug 2010 01:38:15 -0700 (PDT)
From: David Rientjes <rientjes@google.com>
Subject: Re: [S+Q3 00/23] SLUB: The Unified slab allocator (V3)
In-Reply-To: <alpine.DEB.2.00.1008041115500.11084@router.home>
Message-ID: <alpine.DEB.2.00.1008050136340.30889@chino.kir.corp.google.com>
References: <20100804024514.139976032@linux.com> <alpine.DEB.2.00.1008032138160.20049@chino.kir.corp.google.com> <alpine.DEB.2.00.1008041115500.11084@router.home>
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Sender: owner-linux-mm@kvack.org
To: Christoph Lameter <cl@linux-foundation.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Nick Piggin <npiggin@suse.de>
List-ID: <linux-mm.kvack.org>

On Wed, 4 Aug 2010, Christoph Lameter wrote:

> > This insta-reboots on my netperf benchmarking servers (but works with
> > numa=off), so I'll have to wait until I can hook up a serial before
> > benchmarking this series.
> 
> There are potential issues with
> 
> 1. The size of per cpu reservation on bootup and the new percpu code that
> allows allocations for per cpu areas during bootup. Sometime I wonder if I
> should just go back to static allocs for that.
> 
> 2. The topology information provided by the machine for the cache setup.
> 
> 3. My code of course.
> 

I bisected this to patch 8 but still don't have a bootlog.  I'm assuming 
in the meantime that something is kmallocing DMA memory on this machine 
prior to kmem_cache_init_late() and get_slab() is returning a NULL 
pointer.

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