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authorMaciej Wieczor-Retman <[email protected]>2023-10-10 12:42:37 +0200
committerBorislav Petkov (AMD) <[email protected]>2023-10-11 21:48:52 +0200
commit0e3cd31f6e9074886dea5a999bfcc563d144e7de (patch)
tree66b98446f22df97be0ce4bbe61c1dd3fdafe274f /tools/perf/scripts/python/sched-migration.py
parent39c6eed1f61594f737160e498d29673edbd9eefd (diff)
x86/resctrl: Enable non-contiguous CBMs in Intel CAT
The setting for non-contiguous 1s support in Intel CAT is hardcoded to false. On these systems, writing non-contiguous 1s into the schemata file will fail before resctrl passes the value to the hardware. In Intel CAT CPUID.0x10.1:ECX[3] and CPUID.0x10.2:ECX[3] stopped being reserved and now carry information about non-contiguous 1s value support for L3 and L2 cache respectively. The CAT capacity bitmask (CBM) supports a non-contiguous 1s value if the bit is set. The exception are Haswell systems where non-contiguous 1s value support needs to stay disabled since they can't make use of CPUID for Cache allocation. Originally-by: Fenghua Yu <[email protected]> Signed-off-by: Maciej Wieczor-Retman <[email protected]> Signed-off-by: Borislav Petkov (AMD) <[email protected]> Reviewed-by: Ilpo Järvinen <[email protected]> Reviewed-by: Peter Newman <[email protected]> Reviewed-by: Reinette Chatre <[email protected]> Reviewed-by: Babu Moger <[email protected]> Tested-by: Peter Newman <[email protected]> Link: https://lore.kernel.org/r/1849b487256fe4de40b30f88450cba3d9abc9171.1696934091.git.maciej.wieczor-retman@intel.com
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