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Date: Sat, 28 Apr 2007 21:14:48 +0200 From: "Rafael J. Wysocki" <rjw@...k.pl> To: David Lang <david.lang@...italinsight.com> Cc: Pavel Machek <pavel@....cz>, Linus Torvalds <torvalds@...ux-foundation.org>, Nigel Cunningham <nigel@...el.suspend2.net>, Pekka J Enberg <penberg@...helsinki.fi>, LKML <linux-kernel@...r.kernel.org>, Oleg Nesterov <oleg@...sign.ru> Subject: Re: Back to the future. On Saturday, 28 April 2007 20:32, David Lang wrote: > On Sat, 28 Apr 2007, Pavel Machek wrote: > > >> > >> We freeze user space processes for the reasons that you have quoted above. > >> > >> Why we freeze kernel threads in there too is a good question, but not for me to > >> answer. I don't know. Pavel should know, I think. > > > > We do not want kernel threads running: > > > > a) they may hold some locks and deadlock suspend > > > > b) they may do some writes to disk, leading to corruption > > > > We could solve a) by carefully auditing suspend lock usage to make > > sure deadlocks are impossible even with kernel threads running. > > remember that we are doing suspend-to-disk, after we do the snapshot we will be > doing a shutdown. that should simplify the locking issues That's assuming that we won't need to cancel the hibernation. Greetings, Rafael - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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