linux-kernel - Re: pcmcia resume 60 second hang. Re: [patch 00/69] -stable review

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Message-Id: <1180473765.20718.47.camel@nigel.suspend2.net>
Date:	Wed, 30 May 2007 07:22:45 +1000
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	Mark Lord <lkml@....ca>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>,
	Romano Giannetti <romanol@...omillas.es>,
	Chris Wright <chrisw@...s-sol.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	stable@...nel.org, Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Theodore Ts'o <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: pcmcia resume 60 second hang. Re: [patch 00/69] -stable review

Hi.

On Tue, 2007-05-29 at 10:19 -0400, Mark Lord wrote:
> Nigel Cunningham wrote:
> >
> > I'm sorry to say it, but dropping process freezing still seems to me
> > like the better way though. I prefer it because of the reliability
> > aspect. With the current code, having frozen processes, I can look at
> > the state of memory, calculate how much I'll need for this or that and
> > know that I'll have sufficient memory for the atomic copy and for doing
> > the I/O  (making assumptions about how much memory drivers will
> > allocate) before I start to do either. If we stop freezing processes,
> > that predictability will go away. There'll always be a possibility that
> > some process will get memory hungry and stop me from being able to get
> > the image on disk, and I'll have to either abort or give up and try
> > again and again until I can complete writing the image, the battery runs
> > out or whatever... 
> 
> How about blocking brk() and mmap(MAP_ANONYMOUS) in addition to
> the filesystem VFS callers?   Or is that starting to get messy again?

Yeah. Getting messy again :)

Nigel

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