From: Krzysztof Halasa <khc@pm.waw.pl>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Phillip Susi <psusi@cfl.rr.com>, Jun Sun <jsun@junsun.net>,
linux-kernel@vger.kernel.org
Subject: Re: Can Linux live without DMA zone?
Date: Fri, 03 Nov 2006 18:54:13 +0100 [thread overview]
Message-ID: <m364dwju0q.fsf@defiant.localdomain> (raw)
In-Reply-To: <1162505945.14530.98.camel@laptopd505.fenrus.org> (Arjan van de Ven's message of "Thu, 02 Nov 2006 23:19:05 +0100")
Arjan van de Ven <arjan@infradead.org> writes:
> you're right in theory, but the kernel only has a few pools of memory
> available, but not at every bit boundary. there is a 32 bit pool
> (GFP_DMA32) on some, a 30-ish bit pool (GFP_KERNEL) on others, and a 24
> bit pool (GFP_DMA) with basically nothing inbetween.
Perhaps naive question, but... what's wrong with allocating memory
from the top (within given address mask[1], size-wise)? I think we
don't allocate more than 1 page with kmalloc anymore, do we?
[1] - some devices (a specific StrongARM only?) need non-continuous
masks due to a hardware bug(s).
--
Krzysztof Halasa
next prev parent reply other threads:[~2006-11-03 17:54 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-02 2:15 Can Linux live without DMA zone? Jun Sun
2006-11-02 9:16 ` Arjan van de Ven
2006-11-02 10:32 ` Paul Mundt
2006-11-02 16:32 ` Phillip Susi
2006-11-02 16:57 ` Arjan van de Ven
2006-11-02 19:08 ` Phillip Susi
2006-11-02 20:10 ` Arjan van de Ven
2006-11-02 21:26 ` Phillip Susi
2006-11-02 22:19 ` Arjan van de Ven
2006-11-02 23:17 ` Jun Sun
2006-11-02 23:24 ` Stephen Hemminger
2006-11-06 2:19 ` Phillip Susi
2006-11-03 17:54 ` Krzysztof Halasa [this message]
2006-11-02 18:02 ` Alan Cox
-- strict thread matches above, loose matches on Subject: below --
2006-11-02 3:43 Conke Hu
2006-11-02 7:13 ` Peter Zijlstra
2006-11-02 16:13 ` Christoph Lameter
2006-11-02 10:33 Conke Hu
2006-11-02 10:51 ` Arjan van de Ven
2006-11-02 13:09 ` Alan Cox
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