On Wed, Feb 5, 2020 at 9:58 AM David Gow davidgow@google.com wrote:
One thing we'd like to do with kunit_tool is to make its functionality a bit more independent: in particular, allowing the configuration, running the kernel, and parsing the results to be done independently.
If that's the case, it may make sense for "kunit.py run" or similar to not do anything with the .config, and to relegate that to a separate "configuration" step, which would allow someone to modify the configuration themselves (e.g., using make menuconfig) and re-run the tests, but also allow the config to be explicitly regenerated when helpful.
Exactly what that'd end up looking like (and to what extent we'd still want to support a single command that'd do both) are still up in the air: but I think a general "separation of concerns" like this is probably the right path forward for kunit_tool.
You and I have talked about splitting up kunit_tool's functionality before. I agree with the idea.
I imagine it that we would have
- configuration - running tests - dmesg/TAP parsing
as separate runnable scripts. I think that would make it a lot easier for people with various test bed setups to reuse our code in their test harness.
Nevertheless, I think it would also be nice to have, as Ted has previously suggested, a short easy to remember one line command that just works; it is easily said, and much harder to do, but I think it is at odds with the separation of functionality. I guess one solution might just be to have these three separate tools, and then the classic kunit.py script that combines the functionalities in a single step, or as Ted suggested we could have some sort of default "make kunit" command or something like that. I am not really sure what is best here.
It doesn't address the problem of separation of functionality in anyway, but one way we could achieve the idea of having a command that just works, is by putting a line in MAINTAINERS file entries that have a command that a maintainer expects a submitter to run before sending a patch to LKML. That might at least make it possible to hack together a single line KUnit command for every relevant MAINTAINERS entry. (Obviously there is no reason we have to do this particular idea just for KUnit. We could do this for other tests as well.) Russel, I think this was your idea at LCA?
On Tue, Feb 4, 2020 at 6:14 PM SeongJae Park sj38.park@gmail.com wrote:
On Tue, 4 Feb 2020 16:46:06 -0800 Brendan Higgins brendanhiggins@google.com wrote:
Sorry for the delay.
On Mon, Jan 27, 2020 at 10:03 PM SeongJae Park sj38.park@gmail.com wrote:
On Mon, 27 Jan 2020 16:02:48 -0800 Brendan Higgins brendanhiggins@google.com wrote:
On Sat, Jan 25, 2020 at 5:59 PM sj38.park@gmail.com wrote:
From: SeongJae Park sjpark@amazon.de
Deletions of configs in the '.kunitconfig' is not applied because kunit rebuilds '.config' only if the '.config' is not a subset of the '.kunitconfig'. To allow the deletions to applied, this commit modifies the '.config' rebuild condition to addtionally check the modified times of those files.
The reason it only checks that .kunitconfig is a subset of .config is because we don't want the .kunitconfig to remove options just because it doesn't recognize them.
It runs `make ARCH=um olddefconfig` on the .config that it generates from the .kunitconfig, and most of the time that means you will get a .config with lots of things in it that aren't in the .kunitconfig. Consequently, nothing should ever be deleted from the .config just because it was deleted in the .kunitconfig (unless, of course, you change a =y to a =n or # ... is not set), so I don't see what this change would do.
Can you maybe provide an example?
Sorry for my insufficient explanation. I added a kunit test (SYSCTL_KUNIT_TEST) to '.kunitconfig', ran the added test, and then removed it from the file. However, '.config' is not generated again due to the condition and therefore the test still runs.
For more detail:
$ ./tools/testing/kunit/kunit.py run --defconfig --build_dir ../kunit.out/ $ echo "CONFIG_SYSCTL_KUNIT_TEST=y" >> ../kunit.out/.kunitconfig $ ./tools/testing/kunit/kunit.py run --build_dir ../kunit.out/ $ sed -i '4d' ../kunit.out/.kunitconfig $ ./tools/testing/kunit/kunit.py run --build_dir ../kunit.out/The 2nd line command adds sysctl kunit test and the 3rd line shows it runs the added test as expected. Because the default kunit config contains only 3 lines, The 4th line command removes the sysctl kunit test from the .kunitconfig. However, the 5th line still run the test.
This patch is for such cases. Of course, this might make more false positives but I believe it would not be a big problem because .config generation takes no long time. If I missed something, please let me know.
I think I understand.
It is intentional - currently - that KUnit doesn't generate a new .config with every invocation. The reason is basically to support interaction with other methods of generating .configs. Consider that you might want to use make menuconfig to turn something on. It is a pretty handy interface if you work on vastly different parts of the kernel. Or maybe you have a defconfig that you always use for some platform, I think it is easier to run
make foo_config; tools/testing/kunit/kunit.py run
Then having to maintain both your defconfig and a .kunitconfig which is a superset of the defconfig.
Your change would make it so that you have to have a .kunitconfig for every test environment that you care about, and you could not as easily take advantage of menuconfig.
Thank you for this kind answer. Now I understood the intention and agree with that. :)
I think what we do now is a bit janky, and the use cases I mentioned are not super well supported. So I am sympathetic to what you are trying to do, maybe we could have a config option for it?
I think Ted and Bjorn might have opinions on this; they had some related opinions in the past.
I'm ok with current state, but if related discussions continue and my opinion is required, I will join in.
Thanks, SeongJae Park
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