Messages in this thread | | | From | Daniel Colascione <> | Date | Thu, 03 May 2018 16:22:00 +0000 | Subject | Re: [RFC PATCH for 4.18 00/14] Restartable Sequences |
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On Thu, May 3, 2018 at 9:12 AM Mathieu Desnoyers < mathieu.desnoyers@efficios.com> wrote: > By the way, if we eventually find a way to enhance user-space mutexes in the > fashion you describe here, it would belong to another TLS area, and would > be registered by another system call than rseq. I proposed a more generic > "TLS area registration" system call a few years ago, but Linus told me he > wanted a system call that was specific to rseq. If we need to implement > other use-cases in a TLS area shared between kernel and user-space in a > similar fashion, the plan is to do it in a distinct system call.
If we proliferate TLS areas; we'd have to register each one upon thread creation, adding to the overall thread creation path. There's already a provision for versioning the TLS area. What's the benefit of splitting the registration over multiple system calls?
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