linux-kernel - Re: DEBUG_PAGEALLOC + order-10 alloc/free

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Message-ID: <4958DF1C.7010002@cybernetics.com>
Date:	Mon, 29 Dec 2008 09:30:52 -0500
From:	Tony Battersby <tonyb@...ernetics.com>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	venkatesh.pallipadi@...el.com, jeremy@...p.org
Subject: Re: DEBUG_PAGEALLOC + order-10 alloc/free_pages = lockup

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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