Re: [PATCH] cpuset and sched domains: sched_load_balance flag

Ingo Molnar
2007-09-30T17:34:31Z

* Paul Jackson <pj@sgi.com> wrote:

> Add a new per-cpuset flag called 'sched_load_balance'.
>
> When enabled in a cpuset (the default value) it tells the kernel
> scheduler that the scheduler should provide the normal load balancing
> on the CPUs in that cpuset, sometimes moving tasks from one CPU to a
> second CPU if the second CPU is less loaded and if that task is
> allowed to run there.
>
> When disabled (write "0" to the file) then it tells the kernel
> scheduler that load balancing is not required for the CPUs in that
> cpuset.

i like this, this feature would be quite useful for -rt and CPU
shielding.

( a cpuset is a mandatory container for set_cpus_allowed(), so there is
a material and app-visible difference between a 4-CPU cpuset that has
balancing disabled and 4x 1-CPU cpusets. )

Ingo