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There is a comment "Set up shemata with 100% allocation on the first run" in function mbm_setup(), but there is an increment bug and the condition "num_of_runs == 0" will never be met and write_schemata() will never be called to set schemata to 100%. Even if write_schemata() is called in MBM test, since it is not supported for MBM test it does not set the schemata. This is currently fine because resctrl_val_parm->mum_resctrlfs is always 1 and umount/mount will be run in each test to set the schemata to 100%. To support the usage when MBM test does not unmount/remount resctrl filesystem before the test starts, fix to call write_schemata() and set schemata properly when the function is called for the first time. Also, remove static local variable 'num_of_runs' because this is not needed as there is resctrl_val_param->num_of_runs which should be used instead like in cat_setup(). Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
resctrl_tests - resctrl file system test suit
Authors:
Fenghua Yu <fenghua.yu@intel.com>
Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
resctrl_tests tests various resctrl functionalities and interfaces including
both software and hardware.
Currently it supports Memory Bandwidth Monitoring test and Memory Bandwidth
Allocation test on Intel RDT hardware. More tests will be added in the future.
And the test suit can be extended to cover AMD QoS and ARM MPAM hardware
as well.
resctrl_tests can be run with or without kselftest framework.
WITH KSELFTEST FRAMEWORK
=======================
BUILD
-----
Build executable file "resctrl_tests" from top level directory of the kernel source:
$ make -C tools/testing/selftests TARGETS=resctrl
RUN
---
Run resctrl_tests as sudo or root since the test needs to mount resctrl file
system and change contents in the file system.
Using kselftest framework will run all supported tests within resctrl_tests:
$ sudo make -C tools/testing/selftests TARGETS=resctrl run_tests
More details about kselftest framework can be found in
Documentation/dev-tools/kselftest.rst.
WITHOUT KSELFTEST FRAMEWORK
===========================
BUILD
-----
Build executable file "resctrl_tests" from this directory(tools/testing/selftests/resctrl/):
$ make
RUN
---
Run resctrl_tests as sudo or root since the test needs to mount resctrl file
system and change contents in the file system.
Executing the test without any parameter will run all supported tests:
$ sudo ./resctrl_tests
OVERVIEW OF EXECUTION
=====================
A test case has four stages:
- setup: mount resctrl file system, create group, setup schemata, move test
process pids to tasks, start benchmark.
- execute: let benchmark run
- verify: get resctrl data and verify the data with another source, e.g.
perf event.
- teardown: umount resctrl and clear temporary files.
ARGUMENTS
=========
Parameter '-h' shows usage information.
usage: resctrl_tests [-h] [-b "benchmark_cmd [options]"] [-t test list] [-n no_of_bits]
-b benchmark_cmd [options]: run specified benchmark for MBM, MBA and CMT default benchmark is builtin fill_buf
-t test list: run tests specified in the test list, e.g. -t mbm,mba,cmt,cat
-n no_of_bits: run cache tests using specified no of bits in cache bit mask
-p cpu_no: specify CPU number to run the test. 1 is default
-h: help