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Meta
Monthly Archives: March 2009
A bit more than ten years ago…
A bit more than ten years ago, I gave the first-ever RCU conference presentation (though this was a few years before it became known as “RCU”). The presentation went reasonably well, in fact almost half of the attendees stayed awake. … Continue reading
CPU hotplug is not atomic: resolution
Lai Jianshan pulled off an interesting feat, locating a bug in rcu_barrier() by inspection and producing a very nice fix. The interesting part is that he produced the fix just in time for Frederic Weisbecker and perhaps Ingo Molnar as … Continue reading
CPU hotplug is not atomic
Lai Jiangshan found an interesting bug in rcu_barrier() that can result in rcu_barrier() returning too soon when there are concurrent CPU hotplug operations. The best approach thus far seems to be to make rcu_barrier() independent of CPU hotplug. The penalty … Continue reading
“Advising Students for Success” by Jeffrey D. Ullman in March 2009 CACM
Both Patterson’s and Ullman’s “Viewpoint” articles in the March 2009 CACM are well worth reading, as I suspect that much of their advice for working with Ph.D. students applies more generally to working with younger people. I was especially impressed … Continue reading
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Tagged readings
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Remove from structure, and only then invoke call_rcu()…
The idr_remove_all() function in 2.6.28 had an interesting bug. The code traverses the tree from the root down, invoking call_rcu() via the free_layer() function, thereby disposing of the data elements in the tree. Unfortunately, the rcu_assign_pointer() that prevents readers from … Continue reading
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Tagged bugs, rcu
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paulmckrcu 