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Decoding Those Inscrutable RCU CPU Stall Warnings
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lca2018
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Marks
Author(s):
Paul E. McKenney
Location
Great Hall CB01.05.009
Date
jan Mon 22
Days Raw Files
Start
16:35
First Raw Start
16:21
Duration
0:25:0
Offset
0:13:10
End
17:00
Last Raw End
17:21
Chapters
00:00
0:14:34
Total cuts_time
21 min.
http://lca2018.linux.org.au/schedule/presentation/138/
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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!
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