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x86/intel_rdt: Add cpus_list rdtgroup file

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The resource control filesystem provides only a bitmask based cpus file for
assigning CPUs to a resource group. That's cumbersome with large cpumasks
and non-intuitive when modifying the file from the command line.

Range based cpu lists are commonly used along with bitmask based cpu files
in various subsystems throughout the kernel.

Add 'cpus_list' file which is CPU range based.

  # cd /sys/fs/resctrl/
  # echo 1-10 > krava/cpus_list
  # cat krava/cpus_list
  1-10
  # cat krava/cpus
  0007fe
  # cat cpus
  fffff9
  # cat cpus_list
  0,3-23

[ tglx: Massaged changelog and replaced "bitmask lists" by "CPU ranges" ]

Signed-off-by: Jiri Olsa <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Shaohua Li <[email protected]>
Link: http://lkml.kernel.org/r/20170410145232.GF25354@krava
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Jiri Olsa 2017-04-10 16:52:32 +02:00 • committed by Thomas Gleixner
commit 4ffa3c977b
3 changed files with 33 additions and 4 deletions
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3
Documentation/x86/intel_rdt_ui.txt
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@ -59,6 +59,9 @@ There are three files associated with each group:
given to the default (root) group. You cannot remove CPUs
from the default group.
"cpus_list": One or more CPU ranges of logical CPUs assigned to this
group. Same rules apply like for the "cpus" file.
"schemata": A list of all the resources available to this group.
Each resource has its own line and format - see below for
details.