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topdown: Created a component for interfacing with Intel's PERF_METRICS MSR #286

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topdown: Created a component for interfacing with Intel's PERF_METRICS MSR #286

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@willowec willowec commented Nov 17, 2024 •
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Pull Request Description

This PR adds a component that reads the PERF_METRICS Model Specific Register (MSR) and extracts topdown micro-architecture analysis metrics from it, converting those metrics to percentages automatically for ease of use. For example:

$ ./utils/papi_command_line TOPDOWN_RETIRING_PERC TOPDOWN_BAD_SPEC_PERC \ 
    TOPDOWN_FE_BOUND_PERC TOPDOWN_BE_BOUND_PERC

Successfully added: TOPDOWN_RETIRING_PERC
Successfully added: TOPDOWN_BAD_SPEC_PERC
Successfully added: TOPDOWN_FE_BOUND_PERC
Successfully added: TOPDOWN_BE_BOUND_PERC

TOPDOWN_RETIRING_PERC : 	20.784 %
TOPDOWN_BAD_SPEC_PERC : 	0.000 %
TOPDOWN_FE_BOUND_PERC : 	1.961 %
TOPDOWN_BE_BOUND_PERC : 	76.863 %

----------------------------------

Tested systems:

System Name Family/Model/Stepping papi_native_avail papi_component_avail papi_command_line Topdown tests
Raptor Lake-S/HX B0 0x6/0xb7/0x1

While this PR only adds support for RaptorLake, all IA32 systems that support the PERF_METRICS Model Specific Register should be able to be added without much hassle.

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  • Description
    Why this PR exists. Reference all relevant information, including background, issues, test failures, etc
  • Commits
    Commits are self contained and only do one thing
    Commits have a header of the form: module: short description
    Commits have a body (whenever relevant) containing a detailed description of the addressed problem and its solution
  • Tests
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@willowec
topdown: Created a component for interfacing with Intel's PERF_METRIC…
ed66b8d 
…S MSR

Add a component that collects Intel's topdown metrics from the
PERF_METRICS MSR and automatically converts the raw metric values to
user-consumable percentages.

The intent of this component is to provide an intuitive interface for
accessing topdown metrics on the supported processors.

Tested on a RaptorLake-S/HX machine (family/model/stepping
0x6/0xb7/0x1). To add other supported architectures the switch statment
in _topdown_init_component() should be populated for the architecture's
model number, whether it supports level 2 topdown metrics, and in the
case of a heterogeneous processor what core type it must be run on.
@willowec
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If desired, I can add entries for all of the models I am aware of that support the PERF_METRICS MSR, but I am only able to test on RaptorLake.

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