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

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Message-ID: <46304FD7.7050204@bandradar.com>
Date:	Thu, 26 Apr 2007 00:08:07 -0700
From:	Andy Grover <andy@...dradar.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	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)

Alan Cox wrote:

> Mind you some laptops think S2RAM is just a transition state on the way
> to disk, leave them in ACPI S2RAM and the firmware will magically turn it
> into a save to disk and back to ram if the battery runs low or you leave
> it idle too long.

The OS does this (or at least it's supposed to). STR with battery low,
it comes back on fully via a battery wake event, and then STD (aka
snapshot/poweroff). The ACPI state machine always goes through S0, FWIW.

OK, now back to the "should we have 2 function pointers or 4" debate...

-- Andy
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