计算线程被抢占了多少次？

Question

I am trying to determine the impact of context switching on my Java thread. Therefore I would have to know first "how many times has it been preempted?" and second, if possible, "how long was my thread suspended from execution?". I would doubt very much that this can be done from Java, but hey! the fun things is to do the impossible, right? :) Even If I have to recompile the VM or to use some kind of LINUX tool or hack I would be happy. So now that we know that can't be done, let's do it. :)

EDIT: Come on people. The other question was priority related. I guess you just enjoy easy and boring questions. The question is clear and valid.

Answer 1

如果您可以为感兴趣的Java线程标识Linux TID（线程ID）（假设JVM将Java线程映射到Linux线程），则伪文件/proc/<tid>/status包含许多统计信息，包括voluntary_ctxt_switches和nonvoluntary_ctxt_switches 。

Answer 2

显然，它并不能满足您的所有需求，但是您可能会发现java.lang.management提供的ThreadMXBean很有用。