linux-kernel - Re: q[PATCH] selftests/damon: fix damon selftests by installing

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Message-ID: <87v7mrvs5a.fsf_-_@kylinos.cn>
Date: Wed, 13 Aug 2025 11:04:33 +0800
From: Enze Li <lienze@...inos.cn>
To: Sang-Heon Jeon <ekffu200098@...il.com>
Cc: Alexandre Ghiti <alexghiti@...osinc.com>,  SeongJae Park
 <sj@...nel.org>,  Shuah Khan <shuah@...nel.org>,  Andrew Morton
 <akpm@...ux-foundation.org>,  damon@...ts.linux.dev,  linux-mm@...ck.org,
  linux-kselftest@...r.kernel.org,  linux-kernel@...r.kernel.org
Subject: Re: q[PATCH] selftests/damon: fix damon selftests by installing
 _common.sh

Hello Alexandre, Sang-Heon

On Tue, Aug 12 2025 at 10:27:00 PM +0900, Sang-Heon Jeon wrote:

> Hello, Alexandre
>
> On Tue, Aug 12, 2025 at 9:32 PM Sang-Heon Jeon <ekffu200098@...il.com> wrote:
>>
>> Hello, Alexandre
>>
>> On Tue, Aug 12, 2025 at 5:13 PM Alexandre Ghiti <alexghiti@...osinc.com> wrote:
>> >
>> > _common.sh was recently introduced but is not installed and then
>> > triggers an error when trying to run the damon selftests:
>> >
>> > selftests: damon: sysfs.sh
>> > ./sysfs.sh: line 4: _common.sh: No such file or directory
>> >
>> > Install this file to avoid this error.

Excellent catch!  This patch unlocks a testing method that was
completely off my radar. :)

>>
>> I tried to reproduce those error with my vm environment but I failed;
>> with my workaround test method, it doesn't exist.
>> If you're okay, could you please tell me line by line how you execute
>> tests in what environment?
>> I'm also struggling with the test environment, as well.
>
> I succeeded to reproduce and also check that this patch removes those errors.
>

Thanks to Sang-Heon for helping reproduce this issue.  I reproduce this
issue locally as well and I can confirm that this patch will fix it
successfully.

Here's my reproduction procedure:

  # cd /root/linux/
  # make -C tools/testing/selftests/ install INSTALL_PATH=/root/test-dir/
  # cd /root/test-dir/
  # ./run_kselftest.sh -c damon

and I got the following error,

  TAP version 13
  1..13
  # timeout set to 45
  # selftests: damon: sysfs.sh
  # ./sysfs.sh: line 4: _common.sh: No such file or directory
  # ./sysfs.sh: line 369: check_dependencies: command not found     
  ok 1 selftests: damon: sysfs.sh

with Alexandre's patch applied, I got this,

  TAP version 13  
  1..13
  # timeout set to 45
  # selftests: damon: sysfs.sh
  ok 1 selftests: damon: sysfs.sh

The root cause was my misunderstanding of the TEST_FILES macro.  I've now
refined the testing methodology - thanks all for the guidance.

Tested-by: Enze Li <lienze@...inos.cn>

Best Regards,
Enze

>> > Fixes: 511914506d19 ("selftests/damon: introduce _common.sh to host shared function")
>> > Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
>> > ---
>
> Tested-by: Sang-Heon Jeon <ekffu200098@...il.com>
>
>> >  tools/testing/selftests/damon/Makefile | 1 +
>> >  1 file changed, 1 insertion(+)
>> >
>> > diff --git a/tools/testing/selftests/damon/Makefile b/tools/testing/selftests/damon/Makefile
>> > index 5b230deb19e8ee6cee56eb8f18c35e12f331e8b7..ddc69e8bde2905ff1c461a08f2ad008e6b28ac87 100644
>> > --- a/tools/testing/selftests/damon/Makefile
>> > +++ b/tools/testing/selftests/damon/Makefile
>> > @@ -4,6 +4,7 @@
>> >  TEST_GEN_FILES += access_memory access_memory_even
>> >
>> >  TEST_FILES = _damon_sysfs.py
>> > +TEST_FILES += _common.sh
>> >
>> >  # functionality tests
>> >  TEST_PROGS += sysfs.sh
>> >
>> > ---
>> > base-commit: 2754d549af31f8f029f02d02cd8e574676229b3d
>>
>> Does this commit exist in `mm-new` or `damon-next`?  I failed to setup
>> the same base-commit environment.
>
> However, I'm still not sure that this patch is in the correct
> baseline. maybe it will not cause any problems with the merge
> though... but I'm not sure. So I didn't add a reviewed-by tag.
>
>> > change-id: 20250812-alex-fixes_manual-aed3ef75dd83
>> >
>> > Best regards,
>> > --
>> > Alexandre Ghiti <alexghiti@...osinc.com>
>> >
>> >
>>
>> Thank you for great work!
>>
>> Best Regards.
>> Sang-Heon Jeon
>
> Best Regards.
> Sang-Heon Jeon