Convert the cpu source to do feature discovery and creation of feature
labels separately.
Move cpuidutils from source/internal to the source/cpu package. Change
the cpuid custom rule to utilize GetFeatures of the cpu source.
Also, add minimalist unit test.
Specify a new interface for managing "raw" feature data. This is the
first step to separate raw feature data from node labels. None of the
feature sources implement this interface, yet.
This patch unifies the data format of "raw" features by dividing them
into three different basic types.
- keys, a set of names without any associated values, e.g. CPUID flags
or loaded kernel modules
- values, a map of key-value pairs, for features with a single value,
e.g. kernel config flags or os version
- instances, a list of instances each of which has multiple attributes
(key-value pairs of their own), e.g. PCI or USB devices
The new feature data types are defined in a new "pkg/api/feature"
package, catering decoupling and re-usability of code e.g. within future
extentions of the NFD gRPC API.
Rename the Discover() method of LabelSource interface to GetLabels().
Implement new registration infrastructure under the "source" package.
This change loosens the coupling between label sources and the
nfd-worker, making it easier to refactor and move the code around.
Also, create a separate interface (ConfigurableSource) for configurable
feature sources in order to eliminate boilerplate code.
Add safety checks to the sources that they actually implement the
interfaces they should.
In sake of consistency and predictability (of behavior) change all
methods of the sources to use pointer receivers.
Add simple unit tests for the new functionality and include source/...
into make test target.
Drop confusing errors in the log when intel pstate or cstate driver is
not enabled in the system. However, we still log an error if sysfs is
not available at all, in which case we're not able to detect these
correctly.
The naming was changed in when with cpuid v2
(github.com/klauspost/cpuid/v2) and we didn't catch this in NFD. No
issue reports of the inadvertent naming change so let's just adapt to
the updated naming in NFD configuration. The SSE4* labels are disabled
by default so they're not widely used, if at all.
This adds additional cpu features:
- pstate status from status of intel_pstate driver
- pstate scaling settings from scaling_governor
- cstate enable from max_cstates in intel_idle driver
This provides support for 32-bit ARM cpuid capabilities based on
the HWCAP flags, and enables the build of NFD on the 32-bit ARM
userland - notably, this also applies to ARM64 systems that are
running userspace in Aarch32 mode, which is where this problem
was first encountered.
Signed-off-by: Paul Mundt <paul.mundt@adaptant.io>
Extend the FeatureSource interface with new methods for configuration
handling. This enables easier on-the fly reconfiguration of the
feature sources. Further, it simplifies adding config support to feature
sources in the future. Stub methods are added to sources that do not
currently have any configurability.
The patch fixes some (corner) cases with the overrides (--options)
handling, too:
- Overrides were not applied if config file was missing or its parsing
failed
- Overrides for a certain source did not have effect if an empty config
for the source was specified in the config file. This was caused by
the first pass of parsing (config file) setting a nil pointer to the
source-specific config, effectively detaching it from the main config.
The second pass would then create a new instance of the source
specific config, but, this was not visible in the feature source, of
course.
Some workloads may benefit from Intel Turbo Boost technology being
disabled. This patch sets the
'feature.node.kubernetes.io/cpu-pstate.turbo' label to 'false' if we can
detect that it has been disabled. If detection fails no label is
published.
Add 'cpuid/attributeBlacklist' and 'cpuid/attributeWhitelist' config
options for the cpu feature source. These can be used to filter the set
of cpuid capabilities that get published. The intention is to reduce
clutter in the NFD label space, getting rid of "obvious" or misleading
cpuid labels. Whitelisting has higher priority, i.e. only whitelist
takes effect if both attributeWhitelist and attributeBlacklist are
specified.
Remove 'cpuid', 'pstate' and 'rdt' feature sources and move their
functionality under the 'cpu' source. The goal is to have a more
systematic organization of feature sources and labels. After this change
we now basically have one source per type of hw, one for kernel and one
for userspace sw.
Related feature labels are changed, correspondingly, new labels being:
feature.node.k8s.io/cpu-cpuid.<cpuid flag>
feature.node.k8s.io/cpu-pstate.turbo
feature.node.k8s.io/cpu-rdt.<rdt feature>
Detect of the Intel SST-BF (Speed Select Technology - Base Frequency)
has been enabled.
Adds one new feature label:
feature.node.kubernetes.io/cpu-power.sst_bf.enabled=true
Based on a patch from kuralamudhan.ramakrishnan@intel.com
Currently, it only detects one feature, i.e. hardware multithreading
(such as Intel hyper-threading technology). The corresponding feature
label is:
feature.node.kubernetes.io/cpu-hardware_multithreading=true
However, this (architecture/platform dependent) feature is not detected
directly, and, the heuristics can be mislead. Detection works by
checking the thread siblings of each logical (and online) cpu in the
system. If any cpu has any thread siblings the feature label is set to
true. Thus, hardware multithreading could be effectively disabled e.g.
by putting all sibling cpus offline (even if the technology would be
enabled in hardware).
