Hi,
On Mon, Oct 30, 2000 at 01:56:07PM -0500, Jeff Garzik wrote:
>
> Seen it, re-read my question...
>
> I keep seeing "audio drivers' mmap" used a specific example of a place
> that would benefit from kiobufs. The current via audio mmap looks quite
> a bit like mmap_kiobuf and its support cod
Andrea Arcangeli <[EMAIL PROTECTED]> wrote:
>> +map = follow_page(ptr, datain, &failed);
>> +if (failed) {
>> +/*
>> + * Page got stolen before we could lock it down.
>> + * Retry.
>> + */
>>
On Mon, Oct 30, 2000 at 12:45:13PM +0100, Christoph Hellwig wrote:
> @@ -393,10 +396,15 @@
> pmd = pmd_offset(pgd, address);
> if (pmd) {
> pte_t * pte = pte_offset(pmd, address);
> - if (pte && pte_present(*pte))
> + if (pte && pte_present(*pte))
Christoph Hellwig wrote:
>
> On Mon, Oct 30, 2000 at 03:08:31PM -0500, Jeff Garzik wrote:
> > Actually, I wonder if its even possible for mmap_kiobuf to support audio
> > -- full duplex requires that both record and playback buffer(s),
> > theoretically two separate sets of kiobufs, to be present
On Mon, Oct 30, 2000 at 03:08:31PM -0500, Jeff Garzik wrote:
> Actually, I wonder if its even possible for mmap_kiobuf to support audio
> -- full duplex requires that both record and playback buffer(s),
> theoretically two separate sets of kiobufs, to be presented as one space
> (with playback alw
Christoph Hellwig wrote:
>
> On Mon, Oct 30, 2000 at 01:56:07PM -0500, Jeff Garzik wrote:
> > My question from above is: how can the via audio mmap in test10-preXX
> > be improved by using kiobufs? I am not a kiobuf expert, but AFAICS a
> > non-kiobuf implementation is better for audio drivers.
On Mon, Oct 30, 2000 at 01:56:07PM -0500, Jeff Garzik wrote:
> My question from above is: how can the via audio mmap in test10-preXX
> be improved by using kiobufs? I am not a kiobuf expert, but AFAICS a
> non-kiobuf implementation is better for audio drivers. (and the via
> audio mmap implemen
Christoph Hellwig wrote:
> On Mon, Oct 30, 2000 at 12:19:21PM -0500, Jeff Garzik wrote:
> > Take a look at drivers/sound/via82cxxx_audio.c. How can that mmap be
> > improved by using kiobufs?
>
> I think so - but you need Stephen's kvmap patch, that is in the same
> patchset the forward-ported f
On Mon, Oct 30, 2000 at 12:19:21PM -0500, Jeff Garzik wrote:
> Christoph Hellwig wrote:
> > +Locking down user memory and doing mass storage device IO with it is not
> > +the only purpose of kiobufs. Another use for kiobufs is allowing
> > +user-space mmaping dma memory, e.g in sound drivers. To
Christoph Hellwig wrote:
> +Locking down user memory and doing mass storage device IO with it is not
> +the only purpose of kiobufs. Another use for kiobufs is allowing
> +user-space mmaping dma memory, e.g in sound drivers. To do so you
> +need to lock-down kernel virtual memory and refernece i
On Fri, Oct 27, 2000 at 02:23:04PM -0700, Linus Torvalds wrote:
>
> [...]
>
> That solution, btw, might be as simple as just saying:
>
> - raw IO is based on physical pages, and the COW mapping crated by
>fork() may cause the changes to be visibile to either child or parent
>or both, dep
Ok, forgot to Cc linux-kernel ...
Please Cc linus on reply.
- Forwarded message from Christoph Hellwig <[EMAIL PROTECTED]> -
Date: Fri, 27 Oct 2000 22:03:54 +0200
From: Christoph Hellwig <[EMAIL PROTECTED]>
To: Linus Torvalds <[EMAIL PROTECTED]>
Subject: [PATCH] kiob
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