x86/intel_rdt: Add cpus file

Now we populate each directory with a read/write (mode 0644) file
named "cpus". This is used to over-ride the resources available
to processes in the default resource group when running on specific
CPUs.  Each "cpus" file reads as a cpumask showing which CPUs belong
to this resource group. Initially all online CPUs are assigned to
the default group. They can be added to other groups by writing a
cpumask to the "cpus" file in the directory for the resource group
(which will remove them from the previous group to which they were
assigned). CPU online/offline operations will delete CPUs that go
offline from whatever group they are in and add new CPUs to the
default group.

If there are CPUs assigned to a group when the directory is removed,
they are returned to the default group.

Signed-off-by: Tony Luck <[email protected]>
Signed-off-by: Fenghua Yu <[email protected]>
Cc: "Ravi V Shankar" <[email protected]>
Cc: "Shaohua Li" <[email protected]>
Cc: "Sai Prakhya" <[email protected]>
Cc: "Peter Zijlstra" <[email protected]>
Cc: "Stephane Eranian" <[email protected]>
Cc: "Dave Hansen" <[email protected]>
Cc: "David Carrillo-Cisneros" <[email protected]>
Cc: "Nilay Vaish" <[email protected]>
Cc: "Vikas Shivappa" <[email protected]>
Cc: "Ingo Molnar" <[email protected]>
Cc: "Borislav Petkov" <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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