On Thu, 14 Dec 2017, Peter Zijlstra wrote: > > 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.
But what we were talking about are instructions that work effectively in kernel space whose efficiency restartable sequences could bring to user space.
