On Thu, 17 Jul 2014 16:02:26 -0700 Tony Luck <[email protected]> wrote:
> On Mon, Jun 30, 2014 at 1:31 PM, Tony Luck <[email protected]> wrote: > > +#else > > + jiffy *= HZ_TO_NSEC_NUM; > > + do_div(jiffy, HZ_TO_NSEC_DEN); > > + return jiffy; > > +#endif > > Well that didn't work either. kernel/trace/trace_clock.c doesn't include > timeconst.h - so we fail the compile because HZ_TO_NSEC_{NUM,DEN} > aren't defined. a #include looks dicey because timeconst.h is a generated > file up the the kernel/ level ... so getting Makefile dependencies right would > be ugly. > > Do we really need to convert to nanoseconds? Couldn't we just return > jiffies: Sure, and we can make it a "counter". That is, the counters don't hide 1000 counts on output. > > u64 notrace trace_clock_jiffies(void) > { > return jiffies_64 - INITIAL_JIFFIES; > } > > and leave it as an exercise to userspace to interpret that? > > -Tony > > [Yes, this changes the UI . but there can't be any serious users > given that the existing UI only works for 1hr 11 minutes after each > boot] I doubt it will break any tools, so it's fine. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
