dumpsys cpuinfo

文章出处：https://blog.csdn.net/shift_wwx/article/details/42555135

根据android 中的dumpsys和android 查看内存使用情况不做过多的source code解析。

根据：

ServiceManager.addService("cpuinfo", new CpuBinder(m));

找到CpuBinder：

        @Override        protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {            if (mActivityManagerService.checkCallingPermission(android.Manifest.permission.DUMP)                    != PackageManager.PERMISSION_GRANTED) {                pw.println("Permission Denial: can't dump cpuinfo from from pid="                        + Binder.getCallingPid() + ", uid=" + Binder.getCallingUid()                        + " without permission " + android.Manifest.permission.DUMP);                return;            }            synchronized (mActivityManagerService.mProcessCpuThread) {                pw.print(mActivityManagerService.mProcessCpuTracker.printCurrentLoad());                pw.print(mActivityManagerService.mProcessCpuTracker.printCurrentState(                        SystemClock.uptimeMillis()));            }        }

最终就可以获取cpu使用情况了：

130|root@h15:/ # dumpsys cpuinfoLoad: 0.44 / 0.49 / 0.5CPU usage from 79896ms to 19892ms ago:  48% 3803/kdvb-ad-0-fe-0: 0% user + 48% kernel  0.5% 6221/kworker/1:0: 0% user + 0.5% kernel  0.5% 6336/kworker/0:1: 0% user + 0.5% kernel  0.2% 2586/tvserver: 0% user + 0.2% kernel  0.1% 1549/kthread_di: 0% user + 0.1% kernel  0% 3749/system_server: 0% user + 0% kernel / faults: 1 minor  0% 2591/surfaceflinger: 0% user + 0% kernel  0% 3887/com.android.systemui: 0% user + 0% kernel / faults: 4 minor  0% 4034/com.qiyi.video: 0% user + 0% kernel / faults: 2 minor25% TOTAL: 0% user + 25% kernel

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