linux-kernel - how to purposfully fragment memory?

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Message-ID: <46001D5C.3020406@nortel.com>
Date:	Tue, 20 Mar 2007 11:43:56 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	linux-kernel@...r.kernel.org
Subject: how to purposfully fragment memory?

I'm trying to test code paths dealing with fragmented memory, so I'd 
like to have a simple way to cause fragmented memory in the kernel.  Is 
there any API in the kernel that would let me allocate two contiguous 
pages, then free one of them?

I tried the following, but it triggers an oops in free_page():

unsigned long addr =
	__get_free_pages(GFP_KERNEL|__GFP_NORETRY|__GFP_NOWARN, 1);
if (!addr)
	break;
free_page(addr+4096);

Thanks,

Chris
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