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

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Message-ID: <20070425235718.66b71f01@the-village.bc.nu>
Date:	Wed, 25 Apr 2007 23:57:18 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
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)

> Tell me, what does "suspend" do, and what does "freeze" (snapshot) do?
> 
> And name *one* thing that have in common.

Both of them have to ensure you can make a consistent snapshot. Doing
that means you've got to be able to define a single "point" at which the
snapshot is made and is internally self-consistent. That in both cases
tends to mean you've got to ensure nothing occurs which pees on the image
while you are making that snapshot (such as outstanding O_DIRECT I/O to
user pages).

Alan
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