android cpu 利用率
proc/$PID/stat文件中的值
其内容14~17 列 :
seq_put_decimal_ull(m, ' ', cputime_to_clock_t(utime));
seq_put_decimal_ull(m, ' ', cputime_to_clock_t(stime));
seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cutime));
seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cstime));
的四位数字分别是:
utime该任务在用户运行状态的时间
stime该任务在核心运行的时间
cutime所有已死线程在用户状态运行状态的时间
cstime所有已死线程在核心的运行时间
所以processCpuTime为这个四个属性的和.
当前进行所占CPU的算法是:
100*(processCpuTimeS-processCpuTimeF)/(totalCpuTimeS-totalCpuTimeF)
内存:
http://blog.csdn.net/jackjones_008/article/details/41944973
http://www.cnblogs.com/adv-qbj/p/4719787.html
http://gityuan.com/2016/01/02/memory-analysis-command/
- Active = Active(anon) + Active(file) Inactive = Inactive(anon) + Inactive(file)
- Active(file), Inactive(file) has file back-end which means its original file is in disk but to use it faster it was loaded on RAM.
- Active(file) + Inactive(file) + Shmem = Cached + Buffer + SwapCached