Re: [RFC] cpuset: add interface to isolated cpus

[Nick Piggin]

Paul Jackson wrote:
> From: Paul Jackson <pj@xxxxxxx>
>
> Enable user code to isolate CPUs on a system from the domains that
> determine scheduler load balancing.
>
> This is already doable using the boot parameter "isolcpus=".  The folks
> running realtime code on production systems, where some nodes are
> isolated for realtime, and some not, and where it is unacceptable
> to reboot to adjust this, need to be able to change which CPUs are
> isolated from the scheduler balancing code on the fly.
>
> This is done by exposing the kernels cpu_isolated_map as a cpumask
> in the root cpuset directory, in a file called 'isolated_cpus',
> where it can be read and written by sufficiently privileged user code.

This should be done outside cpusets.

--
SUSE Labs, Novell Inc.
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