Re: [PATCH tip/core/rcu 11/17] rcu: Bind grace-period kthreads to non-NO_HZ_FULL CPUs

[Peter Zijlstra]

On Fri, Jul 11, 2014 at 02:05:08PM -0500, Christoph Lameter wrote:
> The use case is pretty straightforward because we are trying to keep as
> much OS noise as possible off most processors. Processor 0 is the
> sacrificial lamb that will be used for all OS processing and hopefully all
> high latency operations will occur there. Processors 1-X have a tick but
> we still try to keep latencies sane. And then there is X-Y where tick is
> off.

So the problem is -- and this isn't too hard to create -- when we
saturate/overload cpu0 with just the housekeeping. At that point it
would be good if we could scale and use multiple housekeepers.
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