User-managed concurrency groups
User-managed concurrency groups
[Kernel] Posted Dec 28, 2021 15:45 UTC (Tue) by corbet
The kernel's thread model is relatively straightforward and performs reasonably well, but that's not enough for all users. Specifically, there are use cases out there that benefit from a lightweight threading model that gives user space control over scheduling decisions. Back in May 2021, Peter Oskolkov posted a patch set implementing an abstraction known as user-managed concurrency groups, or UMCG. Several revisions later, many observers still lack a clear idea of what this patch is supposed to do, much less whether it is a good idea for the kernel. Things have taken a turn, though, with Peter Zijlstra's reimplementation of UMCG.