From: "Martin J. Bligh" <Martin.Bligh@us.ibm.com>
To: vyas niranjan <vyas_nir@yahoo.com>, linux-mm@kvack.org
Subject: Re: 4MB of physical contiguous memory allocation in Linux
Date: Thu, 05 Sep 2002 12:59:12 -0700 [thread overview]
Message-ID: <152710000.1031255952@flay> (raw)
In-Reply-To: <150940000.1031255679@flay>
>> I am writing a driver whereI am trying to allocate
>> 4MB of Physical contiguous memory. Using
>> __get_free_pages, I can allocate maximum of 512 pages
>> in Linux. Is there any way of allocating 4MB of
>> Physical contiguous memory in Linux??
>
> If MAX_ORDER is 10, which it is by default, I think, you should
> be able to get 2^10 = 1024 pages = 4Mb. What happens if you
> do an order 10 allocation? Or turn MAX_ORDER up a little, and
> see what happens ...
Hmmm .... looking at a little of the code, seems like MAX_ORDER is
just really badly named, and it's the maximum order + 1.
Turn it to 11 ... that should fix it.
M.
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prev parent reply other threads:[~2002-09-05 19:59 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-05 19:47 4MB of physical contiguous memory allocation in Linux vyas niranjan
2002-09-05 19:54 ` Martin J. Bligh
2002-09-05 19:59 ` Martin J. Bligh [this message]
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