Messages in this thread | | | Date | Tue, 31 Oct 2006 15:58:19 -0800 | From | Paul Jackson <> | Subject | Re: [RFC] cpuset: Explicit dynamic sched domain cpuset flag |
| |
pj wrote: > 9) Finally, we really do need a way, on a production system, for user > space to ask the kernel where load balancing is limited. > > For example one possible interface would have user space pass a > cpumask to the kernel, and get back a Boolean value, indicating > whether or not there are any limitations on load balancing between > any two CPUs specified in that cpumask.
Ah - a simpler API, more user friendly, more "cpuset API style" friendly:
A read-only, per-cpuset Boolean flag that indicates whether the scheduler is fully load balancing across all 'cpus' of that cpuset.
Internally, the kernel would answer this by seeing whether or not the cpusets cpus_allowed cpumask was a subset of one of the members of the scheduler domains partition.
Call this per-cpuset flag something such as:
sched_is_fully_load_balanced # read-only Boolean
This goes along with having the control flag named something such as:
sched_ok_not_to_load_balance # read-write Boolean
If a task was in a cpuset that had 'sched_is_fully_load_balanced' False, then it might not get load balanced.
-- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson <pj@sgi.com> 1.925.600.0401 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |