def test_ioclass_pid(prepare_and_cleanup):
cache, core = prepare()
ioclass_id = 1
iterations = 20
dd_count = 100
dd_size = Size(4, Unit.KibiByte)
Udev.disable()
# Since 'dd' has to be executed right after writing pid to 'ns_last_pid',
# 'dd' command is created and is appended to 'echo' command instead of running it
dd_command = str(Dd().input("/dev/zero").output(
core.system_path).count(dd_count).block_size(dd_size))
for i in range(iterations):
cache.flush_cache()
output = TestProperties.executor.execute(
"cat /proc/sys/kernel/ns_last_pid")
if output.exit_code != 0:
raise Exception(
f"Failed to retrieve pid. stdout: {output.stdout} \n stderr :{output.stderr}"
)
# Few pids might be used by system during test preparation
pid = int(output.stdout) + 50
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation=True,
rule=f"pid:eq:{pid}&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config_path)
TestProperties.LOGGER.info(f"Running dd with pid {pid}")
# pid saved in 'ns_last_pid' has to be smaller by one than target dd pid
dd_and_pid_command = (
f"echo {pid-1} > /proc/sys/kernel/ns_last_pid && {dd_command}")
output = TestProperties.executor.execute(dd_and_pid_command)
if output.exit_code != 0:
raise Exception(
f"Failed to run dd with target pid. "
f"stdout: {output.stdout} \n stderr :{output.stderr}")
sync()
stats = cache.get_cache_statistics(per_io_class=True,
io_class_id=ioclass_id)
assert stats["dirty"].get_value(Unit.Blocks4096) == dd_count
ioclass_config.remove_ioclass(ioclass_id)
def test_ioclass_pid():
"""
title: Test IO classification by process id.
description: Check if data generated by process with particular id is cached.
pass_criteria:
- No kernel bug.
- IO is classified properly based on process generating IO id.
"""
ioclass_id = 1
iterations = 20
dd_count = 100
dd_size = Size(4, Unit.KibiByte)
with TestRun.step("Prepare cache, core and disable udev."):
cache, core = prepare()
Udev.disable()
with TestRun.step("Prepare dd command."):
# Since 'dd' has to be executed right after writing pid to 'ns_last_pid',
# 'dd' command is created and is appended to 'echo' command instead of running it
dd_command = str(Dd().input("/dev/zero").output(
core.path).count(dd_count).block_size(dd_size))
for _ in TestRun.iteration(range(iterations)):
with TestRun.step("Flush cache."):
cache.flush_cache()
with TestRun.step("Prepare and load IO class config."):
output = TestRun.executor.run("cat /proc/sys/kernel/ns_last_pid")
if output.exit_code != 0:
raise Exception(
f"Failed to retrieve pid. stdout: {output.stdout} \n stderr :{output.stderr}"
)
# Few pids might be used by system during test preparation
pid = int(output.stdout) + 50
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation="1.00",
rule=f"pid:eq:{pid}&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config_path)
with TestRun.step(f"Run dd with pid {pid}."):
# pid saved in 'ns_last_pid' has to be smaller by one than target dd pid
dd_and_pid_command = (
f"echo {pid-1} > /proc/sys/kernel/ns_last_pid && {dd_command}")
output = TestRun.executor.run(dd_and_pid_command)
if output.exit_code != 0:
raise Exception(
f"Failed to run dd with target pid. "
f"stdout: {output.stdout} \n stderr :{output.stderr}")
sync()
with TestRun.step("Check if data was cached properly."):
dirty = cache.get_io_class_statistics(
io_class_id=ioclass_id).usage_stats.dirty
if dirty.get_value(Unit.Blocks4096) != dd_count:
TestRun.LOGGER.error(f"Wrong amount of dirty data ({dirty}).")
ioclass_config.remove_ioclass(ioclass_id)