Message-ID: <4958DF1C.7010002@cybernetics.com>
Date: Mon, 29 Dec 2008 09:30:52 -0500
From: Tony Battersby <tonyb@cybernetics.com>
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To: Arjan van de Ven <arjan@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org,
       Thomas Gleixner <tglx@linutronix.de>,
       Suresh Siddha <suresh.b.siddha@intel.com>,
       venkatesh.pallipadi@intel.com, jeremy@goop.org
Subject: Re: DEBUG_PAGEALLOC + order-10 alloc/free_pages = lockup
References: <49513E33.5050001@cybernetics.com> <20081226094857.GP27747@elte.hu> <4954AA0B.9030401@linux.intel.com>
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Arjan van de Ven wrote:
> I also wonder who is doing an order 10 allocation... that'd worry me ;)
>
>   

I was waiting for someone to ask that.  This is for an embedded device
that spends most of its time doing DMA.  Almost all of main memory is
allocated as an I/O buffer right after booting.  I don't actually need
high-order allocations, but since Linux supports it, I use it to reduce
the number of scatter/gather entries and associated overhead.  Works
great most of the time, except when I hit this bug.

Tony
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