Re: [RFC][PATCH 1/2] sched: Extended scheduler time slice

[Matthew Wilcox]

On Sat, Feb 01, 2025 at 10:22:08PM -0500, Steven Rostedt wrote:
> And before seeing Peter's use of yield(), I was reluctant to use it for
> the very same reasons you mentioned above. In my test programs, I was
> simply using getuid(), as that was one of the quickest syscalls.

Is getuid() guaranteed to issue a syscall?  It feels like the kind of
information that a tricksy libc could cache.  Traditionally, I think
we've used getppid() as the canonical "very cheap syscall" as no layer
can cache that information.