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

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Message-ID: <462FD9A1.5060700@redhat.com>
Date:	Wed, 25 Apr 2007 18:43:45 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Pavel Machek <pavel@....cz>, 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:
> Tell me, what does "suspend" do, and what does "freeze" (snapshot) do?
> 
> And name *one* thing that have in common.
> 
> I'll tell you: Nada. Zero. Zilch. Nothing.
> 
> "Freeze" for a disk is a total no-op. There is no DMA, there is no 
> nothing. In contrast, "suspend" for a disk is a totally valid operation.
> 

Freeze is a subset of suspend, isn't it? (It might be an empty subset
in some cases.)

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