> > > I have discussed the benefits elsewhere. As for the deadlocks -- do > > > you still observe them if you use the version of the freezer which > > > doesn't freeze kernel threads? > > > > In general the only way to guarantee there are no deadlocks is to > > construct the graph of dependencies between tasks. Those dependencies > > are not in practice observable from outside the tasks, so it is > > virtually impossible to construct the graph. > > In which way can user space tasks depend on each other in a way that > allows a them members of that cycle to be in uninterruptible sleep? - process A calls rename() on a fuse fs - process B, the fuse server, starts to process the rename request - process B is frozen before it can reply Now process A is unfreezable. We cannot make rename() restartable, hence it cannot be interruptible. Miklos _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
