x86/intel_rdt: Add tasks files

The root directory all subdirectories are automatically populated with a
read/write (mode 0644) file named "tasks". When read it will show all the
task IDs assigned to the resource group. Tasks can be added (one at a time)
to a group by writing the task ID to the file.  E.g.

Membership in a resource group is indicated by a new field in the
task_struct "int closid" which holds the CLOSID for each task. The default
resource group uses CLOSID=0 which means that all existing tasks when the
resctrl file system is mounted belong to the default group.

If a group is removed, tasks which are members of that group are moved to
the default group.

Signed-off-by: Fenghua Yu <[email protected]>
Cc: "Ravi V Shankar" <[email protected]>
Cc: "Tony Luck" <[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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