On Fri, Mar 07, 2008 at 07:01:35PM +0100, Peter Zijlstra wrote: > The reason Christoph can do without RCU is because he doesn't allow > unregister, and as soon as you drop that you'll end up with something
Not sure to follow, what do you mean "he doesn't allow"? We'll also have to rip unregister regardless after you pointed out the ->release won't be called after calling my mmu_notifier_unregister in 3/4. If you figured out how to retain mmu_notifier_unregister I'm not seeing it anymore. > Curious problem indeed. Would it make sense to require registering these > MMU notifiers when the process is still single threaded along with the > requirement that they can never be removed again from a running process? I'm afraid that won't help much (even if the mmu notifiers users could cope with that restriction like KVM can) because the VM will run concurrently in another CPU despite the task is single threaded. See 2/4 in try_to_unmap_cluster: _start/end are not only invoked in the context of the current task. PS. this problem I pointed out of _end possibly called before _begin is the same for #v9 and EMM V1 as far as I can tell. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
