Messages in this thread | | | Date | Thu, 14 Oct 2010 17:36:28 +0900 | Subject | Re: [RFC][PATCH 1/3] contigous big page allocator | From | FUJITA Tomonori <> |
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On Thu, 14 Oct 2010 09:24:21 +0200 Andi Kleen <andi@firstfloor.org> wrote:
> On Thu, Oct 14, 2010 at 04:07:12PM +0900, FUJITA Tomonori wrote: > > On Wed, 13 Oct 2010 09:01:43 +0200 > > Andi Kleen <andi@firstfloor.org> wrote: > > > > > KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> writes: > > > > > > > > What this wants to do: > > > > allocates a contiguous chunk of pages larger than MAX_ORDER. > > > > for device drivers (camera? etc..) > > > > > > I think to really move forward you need a concrete use case > > > actually implemented in tree. > > > > As already pointed out, some embeded drivers need physcailly > > contignous memory. Currenlty, they use hacky tricks (e.g. playing with > > the boot memory allocators). There are several proposals for this like > > Are any of those in mainline?
The tricks or the proposals?
I think that at least one mainline driver in arm uses such trick but I can't recall the name. Better to ask on the arm mainling list. Also I heard that the are some out-of-tree patches about this.
I think that any such proposal hasn't merged yet. If you are looking for such examples, here's one:
http://lwn.net/Articles/401107/
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