Init pid ns 00064:/* 00065: PID-map pages start out as NULl, they get allocated upon 00066: first use and are never deallocated This way a low pid max 00067: value does not cause lots of bitmaps to be allocated, but 00068: the scheme scales to up to 4 million PIDs, runtime 00069: 00070: struct pid_namespace init_pid_ns=t 00071: kref=i 00072: refcount ATOMIC_INIT(2) 00073: 00074 pidmap =t 00075 [ O. PIDMAP_ENTRIES-1]= ATOMIC_INIT(BITS_PER_PAGE), NULL] 00076: 在 start kernel中,调用 pidmap_in进行合理的初始化 00077: last pid =0 00078 00079 child reaper= &init_task 00080: }; 在 kernel initr中,被修改为ini进程 2021/2/6 Linux操作系统分析 14/65 嵌入式系统实验室 EMBEDDED SYSTEM LAB口RAT口RY SU:MDU INTHUTE OR AOVANCLD STUOY D USTt2021/2/6 Linux操作系统分析 14/65 Init_pid_ns 在kernel_init中，被修改为init进程 在start_kernel中，调用pidmap_init进行合理的初始化