On Sat, 2015-12-12 at 14:11 -0600, Gary Robertson wrote: > On Fri, Dec 11, 2015 at 11:50 AM, Sebastian Andrzej Siewior > <bigeasy@xxxxxxxxxxxxx> wrote: > > * Mike Galbraith | 2015-12-11 15:36:17 [+0100]: > > > > > On Fri, 2015-12-11 at 19:29 +0800, GeHao Kang wrote: > > > > When I enable CONFIG_PREEMPT_RT_FULL and CONFIG_NO_HZ_FULL > > > > in Linux Kernel v4.1.12-rt12, I find the tick on the nohz_full > > > > cpu > > > > never stops. > > > > > > Also - since in RT the tick timer interrupt results in a schedulable > thread running to handle the software interrupt work stimulated by > the > tick - upon exit from the interrupt handler there are always at least > 2 runnable threads in the CPU running the tick if there was a > runnable > task interrupted by the tick event. Yup, handling that was one of the hacks that was dropped. If you look at what all was dropped in one 'let's con NOHZ_FULL into working' patch, you'd think twice about submitting it for review. -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
