Messages in this thread | | | Subject | Re: [PATCH v2 15/45] rcu: Use get/put_online_cpus_atomic() to prevent CPU offline | From | Steven Rostedt <> | Date | Wed, 26 Jun 2013 10:51:11 -0400 |
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On Wed, 2013-06-26 at 07:34 -0700, Paul E. McKenney wrote: > On Wed, Jun 26, 2013 at 03:29:40PM +0100, David Laight wrote: > > > Once stop_machine() is gone from the CPU offline path, we won't be able > > > to depend on disabling preemption to prevent CPUs from going offline > > > from under us. > > > > Could you use an rcu-like sequence so that disabling pre-emption > > would be enough? > > > > Something like rebuilding the cpu list, then forcing yourself > > to run on all the cpu. > > > > That would be far less intrusive. > > It would also increase the latency of CPU-hotunplug operations. >
Is that a big deal?
-- Steve
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