获取堆栈方案也会耗时？

[mikelhm]

    scheduler.scheduleAtFixedRate(new Runnable() {
        @Override
        public void run() {

            long wallTime = FastTimer.currentTimeMillis();
            //todo support cpu time by read /proc/pid/tid/..
            StackTraceElement[] stackTraceElements = targetThread.getStackTrace();
            StackTraceSample stackTraceSample = new StackTraceSample(wallTime, stackTraceElements);
            synchronized (queueLock){
                if (stackTraceSampleQueue.size()>maxCacheCount){
                    stackTraceSampleQueue.poll();
                }
                stackTraceSampleQueue.offer(stackTraceSample);
            }

        }
    }, 0, sampleInterval, TimeUnit.MILLISECONDS);