on 23/11/2010 08:33 Andriy Gapon said the following: > I think that this is quite similar to what we do for per-CPU caches in UMA and > so the same approach should work here. > That is, as in (Open)Solaris, the data should be accessed only from the owning > CPU and spinlock_enter()/spinlock_exit() should be used to prevent races > between > non-interrupt code and nested interrupt code.
Here's a patch that makes our version of cyclic.c a little bit closer to the upstream version whilst implementing the above idea: http://people.freebsd.org/~avg/cyclic-deadlock.diff All accesses to per-CPU cyclics data are performed strictly from the corresponding CPUs in an interrupt or interrupt-like context. "Upcalls" occur in event timer's interrupt filter and all down calls are performed via smp_rendezvous_cpus(). I will appreciate reviews and testing. Thanks! -- Andriy Gapon _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
