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mmtests: add AB testing and comparison support
This commit introduces comprehensive A/B testing and comparison capabilities for the mmtests workflow in kdevops, enabling performance regression detection between baseline and development kernels. Key Features Added: - A/B testing configuration support for mmtests workflow - Automated performance comparison between baseline and dev nodes - Visual performance analysis with graph generation - HTML reports with embedded performance graphs New Components: 1. Defconfigs: - mmtests-ab-testing: Basic A/B testing setup - mmtests-ab-testing-thpcompact: Advanced config with monitoring 2. Comparison Infrastructure (playbooks/roles/mmtests_compare/): - Automated result collection from baseline and dev nodes - Local mmtests repository management with patch support - Multiple comparison output formats (HTML, text, graphs) - Shell scripts for graph generation and HTML embedding 3. Playbook Integration: - mmtests-compare.yml: Orchestrates the comparison workflow - Updated mmtests.yml to target mmtests group specifically - Enhanced hosts template with localhost and mmtests group 4. Result Visualization: - Performance graphs (main, sorted, smoothed trends) - Monitor data visualization (vmstat, mpstat, proc stats) - Professional HTML reports with embedded graphs - Comprehensive comparison tables with statistical analysis 5. Workflow Enhancements: - Support for applying patches from fixes directory - Python script for advanced graph generation - Makefile targets for comparison workflow - Results organization in workflows/mmtests/results/ Technical Improvements: - Added localhost to mmtests hosts template for local operations - Added dedicated mmtests group definition in hosts template - Support for applying patches from fixes directory - Robust error handling in comparison scripts - Dependency management for Perl and Python tools - Temporary file management in /tmp for comparisons Included Patches: - Fix undefined array reference in mmtests compare - Fix library order in thpcompact gcc command The implementation supports the standard kdevops A/B testing pattern where baseline nodes run the stable kernel and dev nodes run the development kernel, with automated comparison and visualization of performance differences between them. Usage: make defconfig-mmtests-ab-testing make bringup make mmtests make mmtests-compare This enables developers to quickly identify performance regressions and improvements between kernel versions with professional-quality reports and visualizations. Generated-by: Claude AI Signed-off-by: Luis Chamberlain <[email protected]>
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‎.gitignore‎

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workflows/nfstest/results/
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workflows/sysbench/results/
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workflows/mmtests/results/
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tmp
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playbooks/roles/linux-mirror/linux-mirror-systemd/*.service
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playbooks/roles/linux-mirror/linux-mirror-systemd/*.timer

‎CLAUDE.md‎

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@@ -111,7 +111,10 @@ make pynfs # NFS testing
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make gitr # Git regression testing
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make ltp # Linux Test Project
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make sysbench # Database performance testing
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make mmtests # Memory management tests from mmtests
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# Memory management testing
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make mmtests # Run memory management tests
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make mmtests-compare # Compare baseline vs dev results (A/B testing)
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```
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### Development Utilities
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- **Supports**: firmware, kmod, sysctl, and other kernel subsystem tests
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- **Location**: `workflows/selftests/`
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### mmtests (Memory Management Testing)
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- **Purpose**: Comprehensive memory management and performance testing
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- **Features**: A/B testing support, automated performance comparison, visual analysis
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- **Location**: `workflows/mmtests/`
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- **Key Capabilities**:
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- Run various memory and performance benchmarks (thpcompact, thpchallenge, etc.)
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- A/B testing between baseline and development kernels
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- Automated performance comparison with statistical analysis
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- Graph generation for performance visualization
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- HTML reports with embedded performance graphs
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#### mmtests A/B Testing and Comparison
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The mmtests workflow supports advanced A/B testing for kernel performance regression detection:
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```bash
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# Setup A/B testing configuration
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make defconfig-mmtests-ab-testing # Basic A/B testing
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make defconfig-mmtests-ab-testing-thpcompact # With monitoring
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# Run the workflow
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make bringup # Provision baseline and dev nodes
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make mmtests # Run tests on both nodes
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make mmtests-compare # Generate comparison reports
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# Results location
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# workflows/mmtests/results/compare/
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# - comparison.html # Main HTML report
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# - comparison.txt # Text-based comparison
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# - graph-*.png # Performance graphs
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# - comparison_report.html # Enhanced report with embedded graphs
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```
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**Comparison Features**:
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- Automated collection of results from baseline and dev nodes
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- Statistical analysis of performance differences
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- Multiple visualization formats:
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- Performance trend graphs
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- Sorted performance comparisons
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- Smoothed data analysis
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- System monitoring graphs (vmstat, mpstat, proc stats)
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- Professional HTML reports with:
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- Summary statistics
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- Detailed per-metric comparisons
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- Embedded performance graphs
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- Color-coded performance indicators
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**Technical Implementation**:
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- Local mmtests repository management with patch support
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- Support for fixing known mmtests issues via patches in `workflows/mmtests/fixes/`
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- Python and shell scripts for advanced graph generation
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- Robust error handling and dependency management
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## Architecture Highlights
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### Configuration System

‎README.md‎

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For more details see [kdevops nfs docs](docs/selftests.md)
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### mmtests - Memory Management and Performance Testing
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kdevops supports running comprehensive memory management and performance tests through mmtests:
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* `make mmtests` - Run memory management benchmarks
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* `make mmtests-compare` - Compare baseline vs development kernel performance (A/B testing)
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Quick A/B testing setup:
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```bash
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make defconfig-mmtests-ab-testing-thpcompact # Configure for A/B testing
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make bringup # Provision baseline and dev nodes
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make mmtests # Run tests on both nodes
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make mmtests-compare # Generate comparison reports
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```
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Results are generated in `workflows/mmtests/results/compare/` with HTML reports,
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performance graphs, and statistical analysis for easy regression detection.
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### CXL
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There is CXL support. You can either use virtualized CXL devices or with

‎defconfigs/mmtests-ab-testing‎

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CONFIG_GUESTFS=y
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CONFIG_LIBVIRT=y
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CONFIG_WORKFLOWS=y
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CONFIG_WORKFLOW_LINUX_CUSTOM=y
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CONFIG_BOOTLINUX=y
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# Enable baseline and dev testing
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CONFIG_KDEVOPS_BASELINE_AND_DEV=y
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# Enable mmtests workflow
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CONFIG_WORKFLOWS_TESTS=y
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CONFIG_WORKFLOWS_LINUX_TESTS=y
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CONFIG_WORKFLOWS_DEDICATED_WORKFLOW=y
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CONFIG_KDEVOPS_WORKFLOW_DEDICATE_MMTESTS=y
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# mmtests configuration - using defaults
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CONFIG_MMTESTS_ENABLE_THPCOMPACT=y
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# Filesystem for tests
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CONFIG_MMTESTS_FS_XFS=y

‎defconfigs/mmtests-ab-testing-thpcompact‎

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CONFIG_GUESTFS=y
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CONFIG_LIBVIRT=y
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CONFIG_WORKFLOWS=y
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CONFIG_WORKFLOW_LINUX_CUSTOM=y
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CONFIG_BOOTLINUX=y
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# Enable baseline and dev testing
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CONFIG_KDEVOPS_BASELINE_AND_DEV=y
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# Enable A/B testing with different kernel references
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CONFIG_BOOTLINUX_AB_DIFFERENT_REF=y
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# Enable mmtests workflow
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CONFIG_WORKFLOWS_TESTS=y
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CONFIG_WORKFLOWS_LINUX_TESTS=y
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CONFIG_WORKFLOWS_DEDICATED_WORKFLOW=y
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CONFIG_KDEVOPS_WORKFLOW_DEDICATE_MMTESTS=y
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# mmtests configuration
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CONFIG_MMTESTS_ENABLE_THPCOMPACT=y
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CONFIG_MMTESTS_ITERATIONS=5
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CONFIG_MMTESTS_MONITOR_INTERVAL=1
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CONFIG_MMTESTS_MONITOR_ENABLE_FTRACE=y
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CONFIG_MMTESTS_MONITOR_ENABLE_PROC_MONITORING=y
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CONFIG_MMTESTS_MONITOR_ENABLE_MPSTAT=y
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CONFIG_MMTESTS_PRETEST_THP_SETTING="always"
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# Filesystem for tests
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CONFIG_MMTESTS_FS_XFS=y

‎playbooks/mmtests-compare.yml‎

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---
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- hosts: localhost
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roles:
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- role: mmtests_compare
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when: kdevops_baseline_and_dev|bool

‎playbooks/roles/gen_hosts/templates/mmtests.j2‎

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{% endif %}
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[dev:vars]
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ansible_python_interpreter = "{{ kdevops_python_interpreter }}"
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[mmtests]
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{% for test_type in mmtests_enabled_test_types %}
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{{ kdevops_host_prefix }}-{{ test_type }}
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{% if kdevops_baseline_and_dev %}
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{{ kdevops_host_prefix }}-{{ test_type }}-dev
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{% endif %}
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{% endfor %}
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[mmtests:vars]
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ansible_python_interpreter = "{{ kdevops_python_interpreter }}"

‎playbooks/roles/mmtests/tasks/main.yaml‎

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path: "{{ data_path }}"
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owner: "{{ data_user }}"
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group: "{{ data_group }}"
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recurse: yes
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state: directory
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- name: Clone mmtests repository
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version: "{{ mmtests_git_version }}"
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force: yes
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- name: Check if mmtests fixes directory exists
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tags: [ 'setup' ]
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delegate_to: localhost
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stat:
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path: "{{ topdir_path }}/workflows/mmtests/fixes/"
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register: fixes_dir
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run_once: false
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- name: Find mmtests patches in fixes directory
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tags: [ 'setup' ]
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delegate_to: localhost
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find:
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paths: "{{ topdir_path }}/workflows/mmtests/fixes/"
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patterns: "*.patch"
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register: mmtests_patches
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when: fixes_dir.stat.exists
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run_once: false
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- name: Copy patches to remote host
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tags: [ 'setup' ]
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become: yes
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become_method: sudo
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copy:
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src: "{{ item.path }}"
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dest: "/tmp/{{ item.path | basename }}"
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mode: '0644'
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with_items: "{{ mmtests_patches.files }}"
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when:
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- fixes_dir.stat.exists
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- mmtests_patches.files | length > 0
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- name: Apply mmtests patches on remote host
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tags: [ 'setup' ]
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become: yes
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become_method: sudo
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shell: |
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cd {{ mmtests_data_dir }}
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git am /tmp/{{ item.path | basename }}
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with_items: "{{ mmtests_patches.files }}"
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when:
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- fixes_dir.stat.exists
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- mmtests_patches.files | length > 0
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ignore_errors: true
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register: patch_results
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- name: Report patch application results
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tags: [ 'setup' ]
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debug:
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msg: |
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Applied {{ mmtests_patches.files | length | default(0) }} patches from fixes directory:
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{% for patch in mmtests_patches.files | default([]) %}
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- {{ patch.path | basename }}
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{% endfor %}
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when:
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- fixes_dir.stat.exists
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- mmtests_patches.files | length > 0
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- name: Generate mmtests configuration
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tags: [ 'setup' ]
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become: yes

‎playbooks/roles/mmtests_compare/defaults/main.yml‎

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---
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# mmtests compare role defaults
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mmtests_data_dir: "{{ data_path }}/mmtests"
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mmtests_results_dir: "{{ mmtests_data_dir }}/work/log/{{ inventory_hostname }}-{{ kernel_version.stdout }}"
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# Git URL is from extra_vars.yaml, fallback to GitHub
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mmtests_git_url: "{{ mmtests_git_url | default('https://github.com/gormanm/mmtests.git') }}"

‎playbooks/roles/mmtests_compare/files/apply_patch.sh‎

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#!/bin/bash
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# Script to apply mmtests patches with proper error handling
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TOPDIR="$1"
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PATCH_FILE="$2"
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cd "$TOPDIR/tmp/mmtests" || exit 1
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PATCH_NAME=$(basename "$PATCH_FILE")
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# Check if patch is already applied by looking for the specific fix
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if grep -q "if (@operations > 0 && exists" bin/lib/MMTests/Compare.pm 2>/dev/null; then
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echo "Patch $PATCH_NAME appears to be already applied"
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exit 0
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fi
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# Try to apply with git apply first
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if git apply --check "$PATCH_FILE" 2>/dev/null; then
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git apply "$PATCH_FILE"
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echo "Applied patch with git: $PATCH_NAME"
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exit 0
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fi
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# Try with patch command as fallback
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if patch -p1 --dry-run < "$PATCH_FILE" >/dev/null 2>&1; then
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patch -p1 < "$PATCH_FILE"
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echo "Applied patch with patch command: $PATCH_NAME"
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exit 0
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fi
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echo "Failed to apply $PATCH_NAME - may already be applied or conflicting"
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exit 0 # Don't fail the playbook

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