[OE-core] [PATCH][RFC] pseudo: intercept syscall() and return ENOTSUP for renameat2

[Seebs]

On Wed, 4 Apr 2018 14:28:11 -0700
Khem Raj <raj.khem at gmail.com> wrote:

> what is the performance impact of adding another stack frame and
> function call in the chain here. Do we have data ?

Very close to unmeasurable, because *almost nothing ever uses syscall*.

This is used only for the case where someone is explicitly calling
syscall(), not for any other system call use case. And my
implementation (which is not the same as this one) also overrides the
wrapper generation, so there's no standard pseudo wrapper overhead
(which is several times larger and involves mutexes and signal mask
changing), it's just passing the call on unless it's SYS_renameat2.

-s