Re: Random abnormal high CPU sys usage related to timer

2016-08-29 Thread Mac Lin
at 6:45 PM, Thomas Gleixner wrote: > On Sat, 27 Aug 2016, Mac Lin wrote: >> Hi Vegard, >> Thanks for the prompt response. >> The commit is introduced since 4.6, but the issue can be reproduced at >> 3.10 (earliest I have ever test). And testing on buildroot+4.7 with >

Re: Random abnormal high CPU sys usage related to timer

2016-08-27 Thread Mac Lin
eally" doing something? x=0 trap 'echo x=$x;exit 1' SIGHUP SIGINT SIGTERM while : ; do x=$(($x+1)); # echo $x; done On Sat, Aug 27, 2016 at 5:12 AM, Vegard Nossum wrote: > On 26 August 2016 at 19:10, Mac Lin wrote: >> We were having issue with ou

Random abnormal high CPU sys usage related to timer

2016-08-26 Thread Mac Lin
perf, all the irq counter, timer counter, timer/irq event didn't show any abnormal value or useful clue. I'm looking forward for any suggestion desperately. Attached the test code and log, and script to detect the issue, which require dstat and taskset. Best Regards, Mac Lin #include #in