Messages in this thread | | | Date | Thu, 10 Apr 2014 22:48:56 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC PATCH RT] rwsem: The return of multi-reader PI rwsems |
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On Thu, Apr 10, 2014 at 03:17:41PM -0400, Steven Rostedt wrote: > On Thu, 10 Apr 2014 17:36:17 +0200 > Peter Zijlstra <peterz@infradead.org> wrote: > > > > It defaults to the total number of CPUs in the system, given the default > > setup (all CPUs in a single balance domain), this should result in all > > CPUs working concurrently on the boosted read sides. > > Unfortunately, it currently defaults to the number of possible CPUs in > the system. I should probably move the default assignment to after SMP > is setup. Currently it happens in early boot before all the CPUs are > running. On boot up, the limit is set to NR_CPUS which should be much > higher than what the system has, but shouldn't matter during boot. But > after all the CPUs are up and running, it can lower it to online CPUs. > > I think I'll go and make v3 of this patch.
Yah, I should have read the patch in more than 5 seconds flat I suppose :-)
modifying the number post smp bringup should be fine.
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