Re: [LTP] Full nohz test

Re: [LTP] Full nohz test

[Cyril Hrubis]

Hi!
> I'm (still...) working on a new test case for testing the NO_HZ_FULL
> kernel feature available from Linux 3.10. This test code depends on a
> tool that performs CPU isolation, which is a requirement for the
> NO_HZ_FULL to work.
> 
> It was previously proposed that this tool, rt-tools, would be a git
> submodule to ltp. That sounded good in the beginning, until I started
> to think about cross-compile, altering install location, etc. Since
> rt-tools uses cmake, and ltp uses autotools, there is no automatic
> inheritance of configuration. It would therefore be easy to miss copying
> some configuration from configure to the cmake invocation, causing
> surprises.
> 
> Since the test case is not intended to be part of default, I suggest
> the simple solution: Just document in the README file that this test
> case requires that the rt-tools are built and installed before the test
> case is run on target, and instructions how to get started with that.

Sounds ok to me. If the tool installs binaries somewhere to the $PATH
you just have to assert that these are installed. For bash code there is
tst_check_cmds function. For C code you can probably use tst_get_path().

In short make sure that the test exits louldy if these are not installed
and point the user to a README in the message.

-- 
Cyril Hrubis
chrubis@suse.cz

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