On 2014/7/8 9:10, xiaofeng.yan wrote: > On 2014/7/7 16:41, Peter Zijlstra wrote: >> On Fri, Jul 04, 2014 at 12:02:21PM +0000, xiaofeng.yan wrote: >>> It could be wrong for the precision of runtime and deadline >>> when the precision is within microsecond level. For example: >>> Task runtime deadline period >>> P1 200us 500us 500us >>> >>> This case need enbale HRTICK feature by the next command >>> PC#echo "HRTICK" > /sys/kernel/debug/sched_features >>> PC#./schedtool -E -t 200000:500000 -e ./test& >>> PC#trace-cmd record -e sched_switch >> Are you actually using HRTICK ? > yes, If HRTICK is close , then all of runtime and deadline will be wrong.
I think what peter meant is, do you use HRTICK in products or just use it for testing/experiment? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/