[LTP] [RFC PATCh] lib: redefine the overall timeout logic of test

[Cyril Hrubis]

Hi!
> I have a different view on the readahead02 test, because the runtime
> resetting is based on pieces of each IO test elapsed time, then reset
> runtime for next time. This applies to any kernels, no matter the faster
> or slower, the elapsed time will be enough for the next tcases[].
> 
> If we put the worst-case runtime into .timeout and reset for the next
> tcases[], which will be multiplied again on debug kernel, actually we
> don't need that since the dynamic runtime comes from a real test.

I do not get why we need to reset anything. The test library does reset
the timeout after each test iteration:

       for (i = 0; i < tst_test->tcnt; i++) {
                saved_results = *results;
                heartbeat();
		^
		this resets the timeout timer so each iteration runs
		with the whole timeout

                tst_test->test(i);

                if (tst_getpid() != main_pid)
                        exit(0);

                tst_reap_children();

                if (results_equal(&saved_results, results))
                        tst_brk(TBROK, "Test %i haven't reported results!", i);
        }

> Maybe I missed something in the test, but we can treat readahead02
> in a separate work. The new patch 4/4 should be modified using .runtime
> instead of .timeout. Feel free to comment your thoughts there.

Why is readahead02 so special that we need to do more than the usuall?

That is:

- measure how long one tests iteration takes on slower hardware
- multiply that by two and set that as a .timeout

-- 
Cyril Hrubis
chrubis@suse.cz