linux-kernel - [PATCH v2 0/2] x86/resctrl: Enable user to view thread or core throttling mode

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Date:   Fri, 21 Aug 2020 11:25:15 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     "Thomas Gleixner" <tglx@...utronix.de>,
        "Borislav Petkov" <bp@...en8.de>, "Ingo Molnar" <mingo@...hat.com>,
        "Tony Luck" <tony.luck@...el.com>,
        "Reinette Chatre" <reinette.chatre@...el.com>,
        "Ravi V Shankar" <ravi.v.shankar@...el.com>,
        "Babu Moger" <babu.moger@....com>
Cc:     "x86" <x86@...nel.org>,
        "linux-kernel" <linux-kernel@...r.kernel.org>,
        Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH v2 0/2] x86/resctrl: Enable user to view thread or core throttling mode

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/cover.1592841671.git.reinette.chatre@intel.com/

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.

Change Log:
v2:
- Rename "arch_throttle_mode" to "throttle_mode" and
  "rdtgroup_rftype_by_name()" to "rdtgroup_rftype_get_by_name()" (Boris).

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