Tag Archives: rcu

Further reading of the Linux-kernel Documentation/RCU/Design/Requirements/Requirements.rst file encounters RCU’s publish/subscribe guarantee. This guarantee ensures that RCU readers that traverse a newly inserted element of an RCU-protected data structure never see pre-initialization garbage in that element. In CONFIG_PREEMPT_NONE=y kernels, this guarantee … Continue reading →

A quick look at the beginning of the Documentation/RCU/Design/Requirements/Requirements.rst file in a recent Linux-kernel source tree might suggest that testing RCU’s fundamental requirements is Job One. And that suggestion would be quite correct. This post describes how rcutorture tests RCU’s … Continue reading →

Using Debuggers With rcutorture So rcutorture found a bug, you have figured out how to reproduce it, git bisect was unhelpful (perhaps because the bug has been around forever), and the bug happens to be one of those rare RCU … Continue reading →

So rcutorture found a bug, whether in RCU or elsewhere, and it is now time to reproduce that bug, whether to make good use of git bisect or to verify an alleged fix. One problem is that, rcutorture being what … Continue reading →

So you read the previous post, but simply running rcutorture did not completely vent your frustration. What can you do? One thing you can do is to tweak a number of rcutorture settings to adjust the manner and type of … Continue reading →

Let’s face it, using synchronization primitives such as RCU can be frustrating. And it is only natural to wish to get back, somehow, at the source of such frustration. In short, it is quite understandable to want to torture RCU. … Continue reading →