User space getpid()

Posted Dec 19, 2002 5:53 UTC (Thu) by ncm (guest, #165)
In reply to: User space gettimeofday() by kbob
Parent article: How to speed up system calls

While getpid() could certainly be put in user space, the
number of programs that it would speed up noticeably
could probably be counted on a pig's hoof. It would be
pretty surprising if any syscall used frequently enough
to make a difference could be handled in user space.

gettimeofday() is called so frequently in real programs
that any speedup matters, at least for some programs.
Few other syscalls have that property.