On Saturday, 28 April 2007 00:08, Linus Torvalds wrote:
Yes. We have a lot less interdependencies to worry about during the whole
operation.
Well, I don't know if that's a 'coherent' explanation from your point of view
(probably not), but I'll try nevertheless:
1) if the kernel threads are frozen, we know that they don't hold any locks
that could interfere with the freezing of device drivers,
2) if they are frozen, we know, for example, that they won't call user mode
helpers or do similar things,
3) if they are frozen, we know that they won't submit I/O to disks and
potentially damage filesystems (suspend2 has much more problems with that
than swsusp, but still. And yes, there have been bug reports related to it,
so it's not just my fantasy).
Probably some other people can say more about it.
It is actually useful for some things other than the hibernation/suspend, the
code is not idiotic (it's one line of code in the majority of cases) and you
should take that "I hate everything even remotely related to hibernation" hat
off, really.
Greetings,
Rafael
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