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September 11-14, 2017 - Los Angeles, CA
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Tuesday, September 12 • 1:55pm - 2:35pm
Decoding Those Inscrutable RCU CPU Stall Warnings - Paul McKenney, IBM

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You are minding your own business when suddenly one of your system splats out something like "INFO: rcu_bh_state detected stalls on CPUs/tasks: { 3 5 } (detected by 2, 2502 jiffies)". Whatever does this RCU CPU stall warning mean and what can you do about it? That is, other than simply beating your head against Documentation/RCU/stallwarn.txt?

This talk will look at a few representative RCU CPU stall warning messages and show how they can be decoded into real information that can help you find otherwise silent hangs the easy way. Or at least an easier way!
Speakers
avatar for Paul McKenney

Paul McKenney

Distinguished Engineer, IBM Linux Technology Center, Beaverton
Paul E. McKenney is a Distinguished Engineer with the IBM Linux Technology Center, where he maintains the RCU implementation within the Linux kernel. He has been coding for four decades, more than half of that on parallel hardware. His prior lives include the DYNIX/ptx kernel at Sequent... Read More →

stallwarning.2017.09.08a pdf
Tuesday September 12, 2017 1:55pm - 2:35pm PDT
Plaza I/II
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