Fuzzing scheduler CFS
I am very interested in finding bugs in such code. In such large projects which method you recommend to seek effective error? I do not necessarily insist on the method of fuzzing, it is one of the options. the answer to your question: The scheduler should work very quickly, and this demonstrates the quality and level of the algorithm. I would like to improve the code, but has not found a practical method of finding errors. Thank you very much for your reply!
On Wed, 22 Jul 2015 10:30:47 +0300, Meyer Lansky said:
I would like to improve the code, but has not found a practical method of finding errors.
Bugs in the scheduler almost always manifest in one of two ways: 1) Truly spectacular crashes or hangs where you *know* you've found a bug. 2) Find a workload that it performs poorly (for instance - how does it deal on a 4-core system with 8 processes that use enough memory that together, they push the system into thrashing mode, plus 40 or 50 processes that only want millisecond timeslices - but at a high realtime priority? Can you find other mixes that give it indigestion? You're going to have to learn a lot about process scheduling to find bugs in that code. And when I say a lot, I mean "probably as much as you'd cover in a full-semester college course"....
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Meyer Lansky -
Valdis.Kletnieks＠vt.edu