linux-kernel - Re: suspend2 merge (was Re: [Suspend2-devel] Re: CFS and suspend2: hang in atomic copy)

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Message-ID: <463008A2.9020301@zytor.com>
Date:	Wed, 25 Apr 2007 19:04:18 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Pavel Machek <pavel@....cz>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Kenneth Crudup <kenny@...ix.com>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Con Kolivas <kernel@...ivas.org>,
	suspend2-devel@...ts.suspend2.net, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: suspend2 merge (was Re: [Suspend2-devel] Re: CFS and suspend2:
 hang in atomic copy)

Linus Torvalds wrote:
> 
> On Thu, 26 Apr 2007, Pavel Machek wrote:
>> Ok, I guess I'll have nightmares of DMA controllers doing DMAs from
>> chips that are no longer there tonight.
> 
> Umm. Welcome to the 21st century: we don't do that "separate DMA 
> controller" thing any more. All devices do their own DMA.
> 

That was the 1990s.  On a brand new server system:

00:08.0 System peripheral: Intel Corporation 5000 Series Chipset DMA
Engine (rev b1)

For better or worse, slave DMA seems to be making a comeback of sorts.
Not to mention all kinds of embedded crap^Whardware with optimized DMA
engines which look nothing like PCI at all.

	-hpa
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