From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Cc: John Williams <john.williams@petalogix.com>,
arnd@arndb.de, linux-arch@vger.kernel.org,
John Linn <linnj@xilinx.com>,
matthew@wil.cx, will.newton@gmail.com, drepper@redhat.com,
microblaze-uclinux@itee.uq.edu.au, grant.likely@secretlab.ca,
Michal Simek <monstr@monstr.eu>,
linux-kernel@vger.kernel.org
Subject: RE: [PATCH] Microblaze: implement dma-coherent API andrefactorcache flush code.
Date: Tue, 6 May 2008 09:23:38 +0200 (CEST) [thread overview]
Message-ID: <Pine.LNX.4.64.0805060923100.3160@anakin> (raw)
In-Reply-To: <20080506003104.4717D19B8050@mail213-sin.bigfish.com>
On Mon, 5 May 2008, Stephen Neuendorffer wrote:
> > -----Original Message-----
> > From: John Williams [mailto:john.williams@petalogix.com]
> >
> > Sure - what I meant is can dma_alloc just call kmalloc to do it's
> work?
>
> I scanned through Linux Device Drivers, and it appears that calling
> get_free_pages is:
> 1) more efficient than kmalloc for large allocations
> 2) allocates physically contiguous memory, which kmalloc doesn't
> necessarily do if there's an mmu.
kmalloc() allocates physically contiguous memory, vmalloc() doesn't.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2008-05-06 7:23 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-05 22:37 [PATCH] Microblaze: implement dma-coherent API and refactor cache flush code Stephen Neuendorffer
2008-05-05 22:37 ` Stephen Neuendorffer
2008-05-05 22:57 ` John Williams
2008-05-05 23:12 ` [PATCH] Microblaze: implement dma-coherent API and refactorcache " Stephen Neuendorffer
2008-05-06 0:14 ` John Williams
2008-05-06 0:31 ` [PATCH] Microblaze: implement dma-coherent API andrefactorcache " Stephen Neuendorffer
2008-05-06 7:23 ` Geert Uytterhoeven [this message]
2008-05-06 9:33 ` Michal Simek
2008-05-06 9:28 ` [PATCH] Microblaze: implement dma-coherent API and refactor cache " Michal Simek
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