I find the root cause, the delayed process run a very long time
before, and its vruntime become very large, and must wait all process;
so it is delayed
the reason is below:
1. there is a low weight load process A (nice=19, weight=15)
2. there is a process B which is doing IO
3. there is a process
I have a programe to test CFS latency or fairness on high load,
the test shows CFS has high latency when disable autogroup
the program is in
https://gist.github.com/anonymous/af21ae289cfa5c6310eeac73b7a478ff.
the programe creates many threads, every thread does thing like:
do {
now =gettime()
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