[PATCH v2 0/4] powerpc/topology: Introduce llc_override kernel parameter

[Shrikanth Hegde <sshegde@linux.ibm.com>]

Provide an option for users to enable cache aware scheduling on powerpc
via a command line parameter.

More details of the problem and context is in cover-letter of v1.
v1: https://lore.kernel.org/all/20261012102037.2477378-1-sshegde@linux.ibm.com/

v1->v2:
- Move to kernel parameters from debugfs. This helps to keep
  llc_id consistent which doesn't change across sched domain
  rebuilds. (Tim Chen)
- Update arch_llc_mask to reflect the override (Tim Chen)
- Limit only to mc, pkg (Srikar Dronamraju)

Notes:

- A selftest for the functional validation of cache aware scheduling
  is a good idea as we discussed in v1. It is a significant change on
  its own and likely takes time. I am thinking it might be good idea to
  revisit selftests for scheduler in general. (We have very few).
  Maybe worth a discussion in coming OSPM. 

- I am on parental leave. This version is pretty much what I had last week
  and I haven't gotten any chance to update since. just sending it out.
  Sorry if I have missed to address any comments.
  Please expect delays in my response.

Shrikanth Hegde (4):
  powerpc/topology: Introduce llc_override kernel parameter
  powerpc/topology: Update mc/pkg flags based on llc_override
  powerpc/topology: update arch_llc_mask based llc_override
  Documentation/powerpc: Add details about llc_override

 .../admin-guide/kernel-parameters.txt         | 15 ++++
 arch/powerpc/include/asm/topology.h           |  8 +--
 arch/powerpc/kernel/smp.c                     | 69 +++++++++++++++++--
 3 files changed, 81 insertions(+), 11 deletions(-)

-- 
2.52.0