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    SubjectRe: [RFC PATCH for 4.16 02/21] rseq: Introduce restartable sequences system call (v12)
    On Thu, Dec 14, 2017 at 03:14:00PM -0600, Christopher Lameter wrote:
    > On Thu, 14 Dec 2017, Mathieu Desnoyers wrote:
    >
    > > If we port this concept to kernel-space (as I start to understand
    > > would be your wish), then a simple pointer store to the current
    > > task_struct would suffice.
    >
    > Certainly such a port would be beneficial for non x86 archs.
    >
    > But my company has extensive user space code that maintains a lot of
    > counters and does other tricks to get full performance out of the
    > hardware. Such a mechanism would also be good from user space. Why keep
    > the good stuff only inside the kernel?

    Mathieu's proposal is for userspace, _only_ userspace.

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