Messages in this thread | | | Date | Tue, 15 Nov 2022 16:45:13 +0100 | Subject | [PATCH v1 0/2] x86/resctrl: implement rename to help move containers' tasks | From | Peter Newman <> |
| |
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.
Without this, we were forced to write all of the task IDs from the container into the tasks file of the new control group. Because a group is free to dynamically create new tasks, we found this approach unusable.
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.
These patches are based on v6.1-rc5
[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/
Thanks! -Peter
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(-)
-- 2.38.1.493.g58b659f92b-goog
| |