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    SubjectRe: [RFC PATCH RT] rwsem: The return of multi-reader PI rwsems
    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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