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

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Message-ID: <465C366C.2070900@rtr.ca>
Date:	Tue, 29 May 2007 10:19:24 -0400
From:	Mark Lord <lkml@....ca>
To:	nigel@...el.suspend2.net
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

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?

Cheers

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