New AMD processors can now support following QoS features.
1. Slow Memory Bandwidth Configuration
With this feature, the QOS enforcement policies can be applied
to the external slow memory connected to the host. QOS enforcement
is accomplished by assigning a Class Of Service (COS) to a processor
and specifying allocations or limits for that COS for each resource
to be allocated.
2. Bandwidth Monitoring Event Configuration (BMEC)
The bandwidth monitoring events mbm_total_event and mbm_local_event
are set to count all the total and local reads/writes respectively.
With the introduction of slow memory, the two counters are not enough
to count all the different types are memory events. With the feature
BMEC, the users have the option to configure mbm_total_event and
mbm_local_event to count the specific type of events.
Following are the bitmaps of events supported.
Bits Description
6 Dirty Victims from the QOS domain to all types of memory
5 Reads to slow memory in the non-local NUMA domain
4 Reads to slow memory in the local NUMA domain
3 Non-temporal writes to non-local NUMA domain
2 Non-temporal writes to local NUMA domain
1 Reads to memory in the non-local NUMA domain
0 Reads to memory in the local NUMA domain
This series adds support for these features.
Feature description is available in the specification, "AMD64 Technology Platform Quality
of Service Extensions, Revision: 1.03 Publication # 56375 Revision: 1.03 Issue Date: February 2022".
Link: https://www.amd.com/en/support/tech-docs/amd64-technology-platform-quality-service-extensions
Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537
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Babu Moger (9):
x86/cpufeatures: Add Slow Memory Bandwidth Allocation feature flag
x86/resctrl: Add a new resource type RDT_RESOURCE_SMBA
x86/resctrl: Detect and configure Slow Memory Bandwidth allocation
x86/cpufeatures: Add Bandwidth Monitoring Event Configuration feature flag
x86/resctrl: Introduce mon_configurable to detect Bandwidth Monitoring Event Configuration
x86/resctrl: Add sysfs interface files to read/write event configuration
x86/resctrl: Add the sysfs interface to read the event configuration
x86/resctrl: Add sysfs interface to write the event configuration
Documentation/x86: Update resctrl_ui.rst for new features
Documentation/x86/resctrl.rst | 123 +++++++++++
arch/x86/include/asm/cpufeatures.h | 2 +
arch/x86/kernel/cpu/resctrl/core.c | 62 ++++++
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 2 +-
arch/x86/kernel/cpu/resctrl/internal.h | 26 +++
arch/x86/kernel/cpu/resctrl/monitor.c | 16 ++
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 237 +++++++++++++++++++++-
arch/x86/kernel/cpu/scattered.c | 2 +
include/linux/resctrl.h | 1 +
9 files changed, 467 insertions(+), 4 deletions(-)
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