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From: "Chris Friesen" <cfriesen@nortel.com>
To: linux-kernel@vger.kernel.org
Subject: how to purposfully fragment memory?
Date: Tue, 20 Mar 2007 11:43:56 -0600	[thread overview]
Message-ID: <46001D5C.3020406@nortel.com> (raw)


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

             reply	other threads:[~2007-03-20 17:44 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-20 17:43 Chris Friesen [this message]
     [not found] ` <a8f16e2b0703201215q78dfdd3du54c77be7c9d843e0@mail.gmail.com>
     [not found]   ` <4600393C.8030401@nortel.com>
2007-03-20 21:34     ` how to purposfully fragment memory? Dan Kruchinin

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