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Meta
Tag Archives: parallel
Verification Challenges
You would like to do some formal verification of C code? Or you would like a challenge for your formal-verification tool? Either way, here you go! Stupid RCU Tricks: rcutorture Catches an RCU Bug, also known as … Continue reading
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Tagged parallel, validation, verification
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A Linux-kernel memory model!
A big “thank you” to all my partners in LKMM crime, most especially to Jade, Luc, Andrea, and Alan! Jade presented our paper (slides, supplementary material) at ASPLOS, which was well-received. A number of people asked how they could learn … Continue reading
Posted in Uncategorized
Tagged linux, locking, multicore, parallel, perfbook, rcu, readings, verification
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Stupid RCU Tricks: rcutorture Accidentally Catches an RCU Bug
With the Linux-kernel v4.13 merge window coming up, it is time to do at least a little heavy-duty testing of the patches destined for v4.14, which had been but lightly tested on my laptop. An overnight run on a larger … Continue reading
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Tagged linux bugs, linux bugs rcu, parallel, rcu, rcutorture, stupid rcu tricks, validation
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Verification Challenge 6: Linux-Kernel Tree RCU
It has been more than two years since I posted my last verification challenge, so it is only natural to ask what, if anything, has happened in the meantime. The answer is “Quite a bit!” I had the privilege of … Continue reading
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Tagged parallel, rcu, validation, verification, verification challenge
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Stupid RCU Tricks: An Early-1970s Example
Up to now, I have been calling out Kung’s and Lehman’s classic 1980 “Concurrent Manipulation of Binary Search Trees” as the oldest mention of something vaguely resembling RCU. However, while looking into the history of reference counting, I found Weizenbaum’s … Continue reading
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Tagged parallel, rcu, stupid rcu tricks
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Stupid RCU Tricks: Ordering of RCU Callback Invocation
Suppose a Linux-kernel task registers a pair of RCU callbacks, as follows: call_rcu(&p->rcu, myfunc); smp_mb(); call_rcu(&q->rcu, myfunc); Given that these two callbacks are guaranteed to be registered in order, are they also guaranteed to be invoked in order?
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Tagged linux, parallel, rcu, stupid rcu tricks
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Stupid RCU Tricks: Hand-over-hand traversal of linked list using SRCU
Suppose that a very long linked list was to be protected with SRCU. Let’s also make the presumably unreasonable assumption that this list is so long that we don’t want to stay in a single SRCU read-side critical section for … Continue reading
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Tagged parallel, stupid rcu tricks
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Dagstuhl Seminar: Compositional Verification Methods for Next-Generation Concurrency
Some time ago, I figured out that there are more than a billion instances of the Linux kernel in use, and this in turn led to the realization that a million-year RCU bug is happening about three times a day … Continue reading
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Tagged bugs, linux bugs, parallel, stupid rcu tricks, stupid smp tricks, workshop
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Verification Challenge 5: Uses of RCU
This is another self-directed verification challenge, this time to validate uses of RCU instead of validating the RCU implementations as in earlier posts. As you can see from Verification Challenge 4, the logic expression corresponding even to the simplest Linux-kernel … Continue reading
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Tagged parallel, rcu, validation, verification, verification challenge
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Verification Challenge 4: Tiny RCU
The first and second verification challenges were directed to people working on verification tools, and the third challenge was directed at developers. Perhaps you are thinking that it is high time that I stop picking on others and instead direct … Continue reading
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Tagged parallel, rcu, validation, verification, verification challenge
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