Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [RFC][PATCH -mm] Freezer: Handle uninterruptible tasks | Date | Sat, 7 Jul 2007 01:00:16 +0200 |
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On Saturday, 7 July 2007 00:38, Oliver Neukum wrote: > Am Freitag, 6. Juli 2007 schrieb Oleg Nesterov: > > Rafael J. Wysocki wrote: > > > > > > This patch makes the freezer skip uninterruptible user space tasks (ie. such > > > that have an mm of their own) when counting the tasks to be frozen. As a > > > result, these tasks have the TIF_FREEZE and TIF_SIGPENDING flags set, but the > > > freezer doesn't wait for them to enter the refrigerator. Nevertheless, they > > > will enter the refrigerator as soon as they change their state. > > > > A small correction: they will enter the refrigerator on return to user-space. > > That is too late. We would need them to go to sleep as soon as they are > woken up. This does not matter if they are in uninterruptible sleep due to > fuse deadlocking, as they won't be woken up, but it kills the other cases.
I'm sorry I can't write anything more about that right now, I'll write more tomorrow.
For now, I can only say that I have reasons to believe that the other cases are not likely to "leak" through the freezer.
Greetings, Rafael
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