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tests: add scheduler policy tests
Add test_scheduler.py to test process scheduler configuration in src/libcrun/scheduler.c. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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Giuseppe Scrivano
@@ -272,6 +272,7 @@ PYTHON_TESTS = tests/test_capabilities.py \
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tests/test_seccomp.py \
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tests/test_time.py \
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tests/test_bpf_devices.py \
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tests/test_scheduler.py \
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tests/test_terminal.py \
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tests/test_commands.py \
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tests/test_net_device.py \
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277
tests/test_scheduler.py
Executable file
277
tests/test_scheduler.py
Executable file
@@ -0,0 +1,277 @@
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#!/bin/env python3
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# crun - OCI runtime written in C
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#
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# Copyright (C) 2017, 2018, 2019 Giuseppe Scrivano <giuseppe@scrivano.org>
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# crun is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# crun is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with crun. If not, see <http://www.gnu.org/licenses/>.
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import os
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import subprocess
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from tests_utils import *
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def test_scheduler_fifo():
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"""Test SCHED_FIFO scheduler policy."""
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if is_rootless():
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return (77, "SCHED_FIFO requires CAP_SYS_NICE")
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conf = base_config()
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add_all_namespaces(conf)
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# Set scheduler to SCHED_FIFO with priority 10
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conf['process']['scheduler'] = {
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'policy': 'SCHED_FIFO',
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'priority': 10
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}
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# Read scheduler policy from /proc/self/sched
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conf['process']['args'] = ['/init', 'cat', '/proc/self/sched']
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try:
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out, _ = run_and_get_output(conf, hide_stderr=True)
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# Just verify the container runs with scheduler config
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return 0
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except subprocess.CalledProcessError as e:
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output = e.output.decode('utf-8', errors='ignore') if e.output else ''
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if "scheduler" in output.lower() or "permission" in output.lower():
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return (77, "SCHED_FIFO not available")
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logger.info("test failed: %s", e)
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return -1
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except Exception as e:
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logger.info("test failed: %s", e)
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return -1
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def test_scheduler_rr():
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"""Test SCHED_RR (round-robin) scheduler policy."""
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if is_rootless():
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return (77, "SCHED_RR requires CAP_SYS_NICE")
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conf = base_config()
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add_all_namespaces(conf)
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# Set scheduler to SCHED_RR with priority 10
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conf['process']['scheduler'] = {
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'policy': 'SCHED_RR',
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'priority': 10
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}
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conf['process']['args'] = ['/init', 'true']
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try:
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out, _ = run_and_get_output(conf, hide_stderr=True)
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return 0
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except subprocess.CalledProcessError as e:
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output = e.output.decode('utf-8', errors='ignore') if e.output else ''
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if "scheduler" in output.lower() or "permission" in output.lower():
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return (77, "SCHED_RR not available")
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logger.info("test failed: %s", e)
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return -1
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except Exception as e:
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logger.info("test failed: %s", e)
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return -1
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def test_scheduler_batch():
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"""Test SCHED_BATCH scheduler policy."""
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conf = base_config()
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add_all_namespaces(conf)
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# SCHED_BATCH doesn't use priority
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conf['process']['scheduler'] = {
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'policy': 'SCHED_BATCH'
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}
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conf['process']['args'] = ['/init', 'true']
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try:
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out, _ = run_and_get_output(conf, hide_stderr=True)
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return 0
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except subprocess.CalledProcessError as e:
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output = e.output.decode('utf-8', errors='ignore') if e.output else ''
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if "scheduler" in output.lower() or "permission" in output.lower():
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return (77, "SCHED_BATCH not available")
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logger.info("test failed: %s", e)
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return -1
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except Exception as e:
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logger.info("test failed: %s", e)
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return -1
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def test_scheduler_idle():
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"""Test SCHED_IDLE scheduler policy."""
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conf = base_config()
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add_all_namespaces(conf)
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# SCHED_IDLE doesn't use priority
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conf['process']['scheduler'] = {
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'policy': 'SCHED_IDLE'
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}
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conf['process']['args'] = ['/init', 'true']
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try:
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out, _ = run_and_get_output(conf, hide_stderr=True)
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return 0
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except subprocess.CalledProcessError as e:
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output = e.output.decode('utf-8', errors='ignore') if e.output else ''
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if "scheduler" in output.lower() or "permission" in output.lower():
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return (77, "SCHED_IDLE not available")
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logger.info("test failed: %s", e)
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return -1
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except Exception as e:
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logger.info("test failed: %s", e)
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return -1
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def test_scheduler_other():
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"""Test SCHED_OTHER (default) scheduler policy."""
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conf = base_config()
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add_all_namespaces(conf)
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# SCHED_OTHER with nice value
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conf['process']['scheduler'] = {
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'policy': 'SCHED_OTHER',
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'nice': 5
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}
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conf['process']['args'] = ['/init', 'true']
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try:
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out, _ = run_and_get_output(conf, hide_stderr=True)
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return 0
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except Exception as e:
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logger.info("test failed: %s", e)
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return -1
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def test_scheduler_nice_value():
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"""Test scheduler with nice value."""
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conf = base_config()
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add_all_namespaces(conf)
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# Set nice value
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conf['process']['scheduler'] = {
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'policy': 'SCHED_OTHER',
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'nice': 10
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}
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# Just verify container runs with nice value set
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conf['process']['args'] = ['/init', 'true']
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try:
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out, _ = run_and_get_output(conf, hide_stderr=True)
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# Container ran with nice value set - test passes
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return 0
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except subprocess.CalledProcessError as e:
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output = e.output.decode('utf-8', errors='ignore') if e.output else ''
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if "scheduler" in output.lower() or "nice" in output.lower():
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return (77, "nice value not supported")
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logger.info("test failed: %s", e)
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return -1
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except Exception as e:
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logger.info("test failed: %s", e)
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return -1
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def test_scheduler_deadline():
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"""Test SCHED_DEADLINE scheduler policy."""
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if is_rootless():
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return (77, "SCHED_DEADLINE requires root")
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conf = base_config()
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add_all_namespaces(conf)
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# SCHED_DEADLINE requires runtime, deadline, period
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conf['process']['scheduler'] = {
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'policy': 'SCHED_DEADLINE',
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'runtime': 10000000, # 10ms
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'deadline': 20000000, # 20ms
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'period': 20000000 # 20ms
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}
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conf['process']['args'] = ['/init', 'true']
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try:
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out, _ = run_and_get_output(conf, hide_stderr=True)
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return 0
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except subprocess.CalledProcessError as e:
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output = e.output.decode('utf-8', errors='ignore') if e.output else ''
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# SCHED_DEADLINE often not available
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if "scheduler" in output.lower() or "permission" in output.lower() or "deadline" in output.lower():
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return (77, "SCHED_DEADLINE not available")
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logger.info("test failed: %s", e)
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return -1
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except Exception as e:
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error_str = str(e).lower()
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if "deadline" in error_str or "scheduler" in error_str:
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return (77, "SCHED_DEADLINE not available")
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logger.info("test failed: %s", e)
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return -1
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def test_scheduler_flags():
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"""Test scheduler with flags (reset_on_fork)."""
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if is_rootless():
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return (77, "SCHED_FIFO with flags requires CAP_SYS_NICE")
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conf = base_config()
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add_all_namespaces(conf)
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# Test with SCHED_RESET_ON_FORK flag
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conf['process']['scheduler'] = {
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'policy': 'SCHED_FIFO',
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'priority': 10,
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'flags': ['SCHED_FLAG_RESET_ON_FORK']
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}
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conf['process']['args'] = ['/init', 'true']
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try:
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out, _ = run_and_get_output(conf, hide_stderr=True)
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return 0
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except subprocess.CalledProcessError as e:
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output = e.output.decode('utf-8', errors='ignore') if e.output else ''
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if "scheduler" in output.lower() or "permission" in output.lower():
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return (77, "scheduler flags not available")
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logger.info("test failed: %s", e)
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return -1
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except Exception as e:
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logger.info("test failed: %s", e)
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return -1
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all_tests = {
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"scheduler-fifo": test_scheduler_fifo,
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"scheduler-rr": test_scheduler_rr,
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"scheduler-batch": test_scheduler_batch,
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"scheduler-idle": test_scheduler_idle,
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"scheduler-other": test_scheduler_other,
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"scheduler-nice-value": test_scheduler_nice_value,
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"scheduler-deadline": test_scheduler_deadline,
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"scheduler-flags": test_scheduler_flags,
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}
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if __name__ == "__main__":
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tests_main(all_tests)
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