[PATCH v5 0/4] Add system-wide tunables

[Michael Jeanson]

On 2026-02-12 15:19, DJ Delorie wrote:
> 
>> One thing I forgot to ask, currently only the tests that need the rseq
>> tunable disabled use GLIBC_TUNABLES to explictly set the value because
>> we expect the default to always be enabled.
>>
>> Since the default could now be disabled by a system-wide policy, should
>> I add GLIBC_TUNABLES to the environment of all rseq tests like this:
>>
>> tst-rseq-nptl-ENV = GLIBC_TUNABLES=glibc.pthread.rseq=1
>>
>> Or would that be considered overzealous?
> 
> Given your concerns about non-overridable settings, I think a check
> inside the test to ensure the tunable is set the way the test expects,
> and UNSUPPORTED if not, should be sufficient.
> 
> If (it's a big if) developers find their machines are usually in a
> non-standard overridable configuration due to system-wide tunables they
> have no control over...  we can revisit this then ;-)

Yeah, I might be a bit paranoid about this, I ship software to clients 
that do run our test suites in "corporate" environments. I've seen things...

As you said, we can revisit this if it turns out to be an issue.

Thanks,

Michael