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    SubjectRe: [RFC PATCH for 4.18 00/14] Restartable Sequences
    ----- On May 3, 2018, at 12:22 PM, Daniel Colascione dancol@google.com wrote:

    > 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?

    See the original discussion thread at

    https://lkml.org/lkml/2016/4/7/502

    Thanks,

    Mathieu

    --
    Mathieu Desnoyers
    EfficiOS Inc.
    http://www.efficios.com

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