[PATCH] ppc32: add CONFIG_HZ

Paul Mackerras paulus at samba.org
Sun Aug 28 12:19:47 EST 2005

Dan Malek writes:

> Yes, the application interfaces are all defined as 100 Hz (10 mSec).
> If the POSIX timer implementation is done properly, it should be
> possible to determine the timer parameters to eliminate this, but
> I doubt any applications do this.  They all assume 10 mSec :-)

There are in fact only a few interfaces that work in terms of "clock
ticks", which are 10ms as far as userspace is concerned.  I can think
of times() and that's about it.  There are also the si_utime and
si_stime fields of the siginfo_t that comes along with a SIGCHLD.  All
of those are about reporting CPU time used, not about specifying

All of the interfaces that specify timeouts or control timers use
struct timeval (seconds + microseconds) or struct timespec (seconds +
nanoseconds), or else use milliseconds (e.g. poll()).


More information about the Linuxppc-dev mailing list