Re: [RFC PATCH for 4.16 02/21] rseq: Introduce restartable sequences system call (v12)

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?