This series enumerates Memory Bandwidth Allocation (MBA) per-thread feature and introduces a new resctrl file "thread_throttle_mode". The file shows either "per-thread" on newer systems that implement the MBA per-thread feature or "max" on other systems that allocate maximum throttling per-core.
Details about the feature can be found in the commit description and in Chapter 9 of the most recent Intel ISE available from https://software.intel.com/sites/default/files/managed/c5/15/architecture-instruction-set-extensions-programming-reference.pdf This series replaces the original MBA thread throttling patch series found at https://lore.kernel.org/lkml/[email protected]/ This is a simplified version of the previous series that skips the min/max mode and just provides the per-core vs. per-thread indicator. Fenghua Yu (2): x86/resctrl: Enumerate per-thread MBA x86/resctrl: Enable user to view thread or core throttling mode Documentation/x86/resctrl_ui.rst | 18 ++++++++- arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/kernel/cpu/cpuid-deps.c | 1 + arch/x86/kernel/cpu/resctrl/core.c | 11 ++++++ arch/x86/kernel/cpu/resctrl/internal.h | 30 ++++++++++++--- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 53 +++++++++++++++++++++++++- arch/x86/kernel/cpu/scattered.c | 1 + 7 files changed, 106 insertions(+), 9 deletions(-) -- 2.19.1
