Hi. On Tuesday 03 July 2007 15:48:26 Benjamin Herrenschmidt wrote: > > > Note, though, that this won't help at all when people use the "suspend-to-ram > > instead of powering down after writing a hibernation image" feature in > > (uswsusp | tuxonice). Fuse is just a broken idea in the first place, but > > given that it exists, we still need to find the underlying cause. > > No, Fuse is not a broken idea in the first place. It's the freezer that > is a totally broken idea. It has proven many times to be racy by design > and cannot be made right. Ther usermode helper mess is just part of > that, fuse is another example, etc etc ... To some extent, I agree. I think the ideal solution would be to simply not schedule processes that are supposed to be frozen. But who wants to play with scheduler code? Not me! > So I think Matthew is totally right. In fact, the presence of the > freezer is the main reason why Paulus so far NACKed Johannes attempts at > merging the PPC PM code with the generic code in kernel/power.c > > We've been doing fine without it so far and intend to continue to do so. Fuse depends on !PPC? > As for suspend-to-disk, I refer you to the discussions we had in the > past with Linus, where he explains I think quite clearly how wrong the > current implementation of STR is :-) I assume you mean STD. The problem there is that Linus doesn't care about STD. If he did, I dare say he'd think through the issues more thoroughly than he apparently has. > Thing is, if you're going to do snapshots, you should probably not sync > after you have "frozen" anyway. Fully agree. But how do you stop things syncing while you're writing the image if you don't have a freezer or equivalent? (scheduler based, kexec.. they're all workarounds for this issue). Regards, Nigel -- Nigel, Michelle and Alisdair Cunningham 5 Mitchell Street Cobden 3266 Victoria, Australia
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