Messages in this thread | | | Subject | Re: [RFC PATCH 1/1] fair.c: Add/Export find_idlest_perfer_cpu API | From | Peter Zijlstra <> | Date | Mon, 20 Aug 2012 14:00:35 +0200 |
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On Fri, 2012-08-17 at 12:46 -0700, Shirley Ma wrote: > Add/Export a new API for per-cpu thread model networking device driver > to choose a preferred idlest cpu within allowed cpumask. > > The receiving CPUs of a networking device are not under cgroup controls. > Normally the receiving work will be scheduled on the cpu on which the > interrupts are received. When such a networking device uses per-cpu > thread model, the cpu which is chose to process the packets might not be > part of cgroup cpusets without using such an API here. > > On NUMA system, by using the preferred cpumask from the same NUMA node > would help to reduce expensive cross memory access to/from the other > NUMA node. > > KVM per-cpu vhost will be the first one to use this API. Any other > device driver which uses per-cpu thread model and has cgroup cpuset > control will use this API later.
How often will this be called and how do you obtain the cpumasks provided to the function?
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