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From: yipee <yipeeyipeeyipeeyipee@yahoo.com>
To: linux-kernel@vger.kernel.org
Subject: Re: changing physical page
Date: Fri, 3 Feb 2006 04:58:07 +0000 (UTC)	[thread overview]
Message-ID: <loom.20060203T055339-322@post.gmane.org> (raw)
In-Reply-To: Pine.LNX.4.61.0602021138001.21010@chaos.analogic.com

linux-os (Dick Johnson <linux-os <at> analogic.com> writes:

[snip]
 
> If your program(s) rely upon being in some physical location,
> they are broken. Even with mlockall(), you just keep them
> where they are, not where you'd like them to be. If you
> are trying to DMA into/out-of user-space, there is only
> ONE way to do it. Your driver allocates DMA-able pages and
> your code mmaps() it into user-space. That way, the page(s)
> are always present and have the right attributes. If you
> malloc() something, then try to "convert" in the kernel
> through your driver, the code's broken.

And all this page-moving for getting contiguous DMA memory, happens today on
x86_64 kernels?
Can you please give me a pointer to the source code?


Thanks



  reply	other threads:[~2006-02-03  4:58 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-02-02 15:08 changing physical page yipee
2006-02-02 15:50 ` linux-os (Dick Johnson)
2006-02-02 16:23   ` yipee
2006-02-02 16:47   ` linux-os (Dick Johnson)
2006-02-03  4:58     ` yipee [this message]
2006-02-02 17:18 ` Hugh Dickins
2006-02-04 14:29   ` yipee
2006-02-04 15:20     ` Hugh Dickins
2006-02-05  7:00       ` Gleb Natapov
2006-02-05 11:55         ` Hugh Dickins

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