Re: [RFC patch] introduce sys_membarrier(): process-wide memory barrier (v9)

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Nick Piggin wrote:

When writing multiprocessor scalable software, threads should often be
avoided. They share so much state that it is easy to run into
scalability issues in the kernel. So yes it would be really nice to
have userspace RCU available in a process-shared mode.

A bit off topic, but I'm interested in what you feel some of these scalability issues are. Is it mostly bouncing this shared context from one CPU to the next and the related cache effects, or is there something more you are referring to?

--
Darren Hart
IBM Linux Technology Center
Real-Time Linux Team
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