[PATCH] perf test: Test 73 Sig_trap fails on s390
John Garry
john.garry at huawei.com
Tue Jan 18 02:20:37 PST 2022
Hi Leo,
>> test child forked, pid 45193
> Both Arm and Arm64 platforms cannot support signal handler with
> breakpoint, please see the details in [1].
Thanks for the info.
>So I think we need
> something like below:
>
ok
> static int test__sigtrap(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
> {
> ...
>
> if (!BP_SIGNAL_IS_SUPPORTED) {
> pr_debug("Test not supported on this architecture");
> return TEST_SKIP;
> }
>
> ...
> }
>
> Since we have defined BP_SIGNAL_IS_SUPPORTED, I think we can reuse it at
> here.
Do you know any other architectures which would have this issue? Or a
generic way to check for support?
It's better to not have to add to this list arch-by-arch..
>
> [1]https://lore.kernel.org/lkml/157169993406.29376.12473771029179755767.tip-bot2@tip-bot2/
>
>> And fails on my x86 broadwell machine:
>>
>> john at localhost:~/kernel-dev2/tools/perf> sudo ./perf test -v 73
>> 73: Sigtrap :
>> --- start ---
>> test child forked, pid 22255
>> FAILED sys_perf_event_open(): Argument list too long
>> test child finished with -1
>> ---- end ----
>> Sigtrap: FAILED!
>> john at localhost:~/kernel-dev2/tools/perf>
> It is a bit suprise for the failure on x86, as I remembered x86 platform
> can support signal handler with hw breakpoint. And from the error
> "Argument list too long", it should be a different issue from other
> archs.
Yeah, I don't know what's going on here.
Thanks,
John
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