linux-kernel - Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway

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Message-ID: <Pine.LNX.4.44L0.0707051713440.2753-100000@iolanthe.rowland.org>
Date:	Thu, 5 Jul 2007 17:15:24 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Miklos Szeredi <miklos@...redi.hu>
cc:	oliver@...kum.org, <pavel@....cz>, <paulus@...ba.org>,
	<johannes@...solutions.net>, <rjw@...k.pl>,
	<linux-pm@...ts.linux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <mjg59@...f.ucam.org>,
	<benh@...nel.crashing.org>
Subject: Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to
 RAM pathway

On Thu, 5 Jul 2007, Miklos Szeredi wrote:

> I fear, that your efforts to "save" the freezer are in vain.  It is
> already moderately hackish with that PF_FREEZER_SKIP and the kernel
> dotted randomly with try_to_freeze() calls, but adding bandaids to try
> to order freezing userspace processes in the right order would just
> make it a horrible mess.

I agree that bandaids won't work.  What's needed is something more 
radical.  Things like FUSE must be written so that the kernel parts 
_can_ freeze even while they are waiting for a response from a user 
thread.

Alan Stern

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