linux-kernel - Re: [PATCH v3 2/5] selftests/resctrl: Make resctrl

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Date:   Wed, 23 Feb 2022 17:13:21 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     "tan.shaopeng@...itsu.com" <tan.shaopeng@...itsu.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Shuah Khan <shuah@...nel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v3 2/5] selftests/resctrl: Make resctrl_tests run using
 kselftest framework

On 2/22/22 12:55 AM, tan.shaopeng@...itsu.com wrote:
> Hi Khan,
> 
>> On 2/15/22 7:26 PM, Shaopeng Tan wrote:
>>> In kselftest framework, all tests can be build/run at a time, and a
>>> sub test also can be build/run individually. As follows:
>>> $ make -C tools/testing/selftests run_tests $ make -C
>>> tools/testing/selftests TARGETS=ptrace run_tests
>>>
>>> However, resctrl_tests cannot be run using kselftest framework, users
>>> have to change directory to tools/testing/selftests/resctrl/, run
>>> "make" to build executable file "resctrl_tests", and run "sudo
>>> ./resctrl_tests" to execute the test.
>>>
>>> To build/run resctrl_tests using kselftest framework.
>>> Modify tools/testing/selftests/Makefile and
>>> tools/testing/selftests/resctrl/Makefile.
>>>
>>> Even after this change, users can still build/run resctrl_tests
>>> without using framework as before.
>>>
>>> Signed-off-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
>>> ---
>>> Some important feedbacks from v1&v2 are addressed as follows:
>>>
>>> - The changelog mentions that changes were made to the resctrl
>>>     selftest Makefile but it does not describe what the change accomplish
>>>     or why they are needed.
>>>     => By changing the Makefile, resctrl_tests can use kselftest
>>>        framework like other sub tests. I described this in changelog.
>>>
>>> - The changelog did not describe how a user may use the kselftest
>>>     framework to run the resctrl tests nor the requested information
>>>     on how existing workflows are impacted.
>>>     => I described how to build/run resctrl_tests with kselftest framework,
>>>        and described the existing workflows are not impacted that users can
>>>        build/run resctrl_tests without using kselftest framework as before.
>>>
>>> - tools/testing/selftests/resctrl/README should be updated.
>>>     => I separate the update of README to a new patch.[patch v3 3/5]
>>>
>>> - Why is the meaning of "EXTRA_SOURCES" (i.e. what is "extra"?) and
>>>     why is "SRCS" no longer sufficient?
>>>     => I referred to other Makefiles, and found "SRCS" is better
>>>        than "EXTRA_SOURCES". So, I updated it to use "SRCS".
>>>
>>>    tools/testing/selftests/Makefile         |  1 +
>>>    tools/testing/selftests/resctrl/Makefile | 20 ++++++--------------
>>>    2 files changed, 7 insertions(+), 14 deletions(-)
>>>
>>> diff --git a/tools/testing/selftests/Makefile
>>> b/tools/testing/selftests/Makefile
>>> index c852eb40c4f7..7df397c6893c 100644
>>> --- a/tools/testing/selftests/Makefile
>>> +++ b/tools/testing/selftests/Makefile
>>> @@ -51,6 +51,7 @@ TARGETS += proc
>>>    TARGETS += pstore
>>>    TARGETS += ptrace
>>>    TARGETS += openat2
>>> +TARGETS += resctrl
>>>    TARGETS += rlimits
>>>    TARGETS += rseq
>>>    TARGETS += rtc
>>> diff --git a/tools/testing/selftests/resctrl/Makefile
>>> b/tools/testing/selftests/resctrl/Makefile
>>> index 6bcee2ec91a9..de26638540ba 100644
>>> --- a/tools/testing/selftests/resctrl/Makefile
>>> +++ b/tools/testing/selftests/resctrl/Makefile
>>> @@ -1,17 +1,9 @@
>>> -CC = $(CROSS_COMPILE)gcc
>>> -CFLAGS = -g -Wall -O2 -D_FORTIFY_SOURCE=2 -SRCS=$(wildcard *.c)
>>> -OBJS=$(SRCS:.c=.o)
>>> +CFLAGS += -g -Wall -O2 -D_FORTIFY_SOURCE=2
>>>
>>> -all: resctrl_tests
>>> +TEST_GEN_PROGS := resctrl_tests
>>> +SRCS := $(wildcard *.c)
>>>
>>> -$(OBJS): $(SRCS)
>>> -	$(CC) $(CFLAGS) -c $(SRCS)
>>> +all: $(TEST_GEN_PROGS)
>>>
>>> -resctrl_tests: $(OBJS)
>>> -	$(CC) $(CFLAGS) -o $@ $^
>>> -
>>> -.PHONY: clean
>>> -
>>> -clean:
>>> -	$(RM) $(OBJS) resctrl_tests
>>> +$(TEST_GEN_PROGS): $(SRCS)
>>
>> This patch breaks the test build - the below use-cases fail
>>
>> make kselftest-all TARGETS=resctrl
>> make -C  tools/testing/selftests/ TARGETS=resctrl
>>
>> Also a simple make in tools/testing/selftests/resctr
> 
> Thanks for your feedbacks.
> I applied these patches to the source below and built
> resctrl_tests successfully using above use-cases on x86/arm machine.
> (1)
>   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>   Tag: v5.16
> (2)
>   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
>   Tag: next-20220217
> 
> Could you tell me which kernel source you used to build
> and what error message you got?
> 

I tried this on Linux 5.17-rc4

thanks,
-- Shuah