[LTP] [PATCH v4 0/4] New Fuzzy Sync library API

[Richard Palethorpe]

Hello,

Cyril Hrubis <chrubis@suse.cz> writes:

> Hi!
>> Interesting that it is so slow on an x86 system, but it also makes sense
>> with a single core because these are all multi-threaded tests. If the
>> kernel is completely preemptive then it may be theoretically possible to
>> trigger one of these bugs on a single core, but most people seem to
>> think the probability of it happening is lower than on a multi-core
>> machine.
>>
>> I am tempted to simply exit the test with TCONF if it is a single core
>> system. If we do allow them to run on a single core then we have to test
>> that they work reasonably well on single cores (given enough
>> time). Which I just don't think is worth doing based on the times you
>> have given.
>
> Well some of these test still trigger kernel crashes on single CPU
> 300Mhz arm quite reliably. If anything we may want to disable some
> subset on slow single CPUs, but then someone would have to do the
> selection which is probably not worth of the trouble.

OK, I think Jan's patch to limit the sampling time is a reasonably good
solution for now. Also I think based on new evidence we can say the
tests work on single CPUs in practice, it just takes longer.

--
Thank you,
Richard.