[LTP] getrusage04 on ARM fails sometimes

[Sebastian Frias <sf84@laposte.net>]

Hi,

We are wondering if other people have issues with getrusage04 LTP test.
We see it failing sometimes on our ARM platform.
It seems to happen most often when CONFIG_HZ=300 than when CONFIG_HZ=100.

When the test was introduced (https://sourceforge.net/p/ltp/mailman/message/27853271/) it did not support the "-m" parameter, which is meant to broaden the "acceptance" interval.
The "-m" parameter was added by people from ST (fd875256d6f99102e3940c4dfc6b0a8a27f4d62c), so presumably working on embedded (probably ARM) systems.
Some people are increasing that interval (https://ez.analog.com/docs/DOC-9111).

Also, according to the commit history, the test is disabled on QEMU, Xen and other environments.

Questions:
1) Does anybody else using ARM has issues with this test? Or is it just us?
2) Do you suggest that we increase the "-m" parameter?
3) Do you know of another test that could be used to double check that getrusage04 failure is a false positive?

Thanks, regards,

Sebastian