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Message-ID: <20070712091553.GC1866@elf.ucw.cz> Date: Thu, 12 Jul 2007 11:15:53 +0200 From: Pavel Machek <pavel@....cz> To: Miklos Szeredi <miklos@...redi.hu> Cc: nigel@...el.suspend2.net, rjw@...k.pl, a1426z@...ab.com, jeremy@...p.org, jbms@....edu, nickpiggin@...oo.com.au, linux-kernel@...r.kernel.org, akpm@...ux-foundation.org Subject: Re: Hibernation Redesign Hi! > > > Freezing of tasks is slowing down suspend. Don't know how serious > > > this is, suspend is pretty fast, but could possibly be even faster. > > > > It's FUD. Freezing of tasks normally takes next to no time. I've never > > understood the rediculously long timeout it has. If freezing succeeds, all > > processes are frozen within 1/2 a second tops. If it fails, nothing is going > > to change in the following 19.5 seconds (or whatever it is if I don't > > remember the value properly). > > Right. The 20s timeout is again a sign of brokenness. Well, "scenario 1/2 - simple/tricky deadlock" is a sign of brokenness, too. > If we expect something to fail, it should fail immediately, without > waiting for arbitrary timeouts. Agreed that freezer is not nice, but core issue here is that fuse allows userspace tasks to hold kernel locks... bad. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - 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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