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Date: Tue, 3 Jul 2007 16:51:09 +0200 From: "Rafael J. Wysocki" <rjw@...k.pl> To: Johannes Berg <johannes@...solutions.net> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>, Matthew Garrett <mjg59@...f.ucam.org>, linux-kernel@...r.kernel.org, Pavel Machek <pavel@....cz>, linux-pm@...ts.linux-foundation.org Subject: Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway On Tuesday, 3 July 2007 16:21, Johannes Berg wrote: > On Tue, 2007-07-03 at 14:56 +0200, Rafael J. Wysocki wrote: > > > Still, can you please read this post from Alan Stern: > > > > https://lists.linux-foundation.org/pipermail/linux-pm/2007-June/012847.html > > > > ? I don't think I'm able to repeat the arguments given in there in a > > convincing way. > > As I read it, Alan basically has two objections: > (1) drivers shouldn't need to worry about this > (2) suspend should be transparent to userspace > > His proposed solution (freezing tasks when they cross the kernel > boundary) helps for the s-t-r case, but in fact doesn't solve (1) > because devices can be suspended at runtime This is a different thing and a different infrastructure is needed for it (not present at the moment). > and then you certainly do not want to freeze tasks that try to access the > device. > > (2) is related but not identical, what if you have a device suspended at > runtime and some tasks tries to access it; should the task block until > you wake up that device? I think the device should be woken up in that case. > I think the core of the discussion isn't appreciated by everybody here > yet---we need to solve both run-time and suspend-to-ram-time device > suspend, not just one of them. For now, we're discussing the suspend-to-ram-time suspend only, for which we have (some) infrastrcuture (and which should be supported by all drivers, IMO). Greetings, Rafael -- "Premature optimization is the root of all evil." - Donald Knuth - 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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