x86/resctrl: Detect Sub-NUMA Cluster (SNC) mode

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There isn't a simple hardware bit that indicates whether a CPU is running in
Sub-NUMA Cluster (SNC) mode. Infer the state by comparing the number of CPUs
sharing the L3 cache with CPU0 to the number of CPUs in the same NUMA node as
CPU0.

Add the missing definition of pr_fmt() to monitor.c. This wasn't noticed
before as there are only "can't happen" console messages from this file.

  [ bp: Massage commit message. ]

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-19-tony.luck@intel.com

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Tony Luck 2024-06-28 14:56:18 -07:00 • committed by Borislav Petkov (AMD)

parent 21b362cc76

commit 13488150f5

1 changed files with 66 additions and 0 deletions

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arch/x86/kernel/cpu/resctrl/monitor.c

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