[PATCH v2 0/2] x86/resctrl: Implement rename to help move containers' tasks

[Peter Newman <peternewman@google.com>]

Hi Reinette, Fenghua,

This patch series implements the solution Reinette suggested in the
earlier RFD thread[1] for the problem of moving a container's tasks to a
different control group on systems that don't provide enough CLOSIDs to
give every container its own control group.

This change originally depended on the CLOSID update race fix[2] to
provide a race-free mechanism for notifying the CPUs where moved tasks
were residing. However, now that the current guidance for group task
movement is to broadcast IPIs to all CPUs, this patch can be applied
independently.

This patch series assumes that a MON group's CLOSID can simply be
changed to that of a new parent CTRL_MON group. This is allowed on Intel
and AMD, but not MPAM implementations. While we (Google) only foresee
needing this functionality on Intel and AMD systems, this series should
hopefully be a good starting point for supporting MPAM.

Thanks!
-Peter

Updates:

v2: reworded change logs based on what I've learned from review comments
    in another patch series[3]

[v1] https://lore.kernel.org/lkml/20221115154515.952783-1-peternewman@google.com/

[1] https://lore.kernel.org/lkml/7b09fb62-e61a-65b9-a71e-ab725f527ded@intel.com/
[2] https://lore.kernel.org/lkml/20221103141641.3055981-2-peternewman@google.com/
[3] https://lore.kernel.org/lkml/54e50a9b-268f-2020-f54c-d38312489e2f@intel.com/

Peter Newman (2):
  x86/resctrl: Factor rdtgroup lock for multi-file ops
  x86/resctrl: Implement rename op for mon groups

 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 101 +++++++++++++++++++++----
 1 file changed, 88 insertions(+), 13 deletions(-)


base-commit: b7b275e60bcd5f89771e865a8239325f86d9927d
-- 
2.38.1.584.g0f3c55d4c2-goog