11.5. 禁用 PC 卡守护进程来降低 CPU 使用量

流程

1. 检查 pcscd 守护进程的状态。

   # systemctl status pcscd
   ● pcscd.service - PC/SC Smart Card Daemon
        Loaded: loaded (/usr/lib/systemd/system/pcscd.service; indirect; vendor preset: disabled)
        Active: active (running) since Mon 2021-03-01 17:15:06 IST; 4s ago
   TriggeredBy: ● pcscd.socket
          Docs: man:pcscd(8)
      Main PID: 2504609 (pcscd)
         Tasks: 3 (limit: 18732)
        Memory: 1.1M
           CPU: 24ms
        CGroup: /system.slice/pcscd.service
                └─2504609 /usr/sbin/pcscd --foreground --auto-exit

   Active 参数显示 pcsd 守护进程的状态。

2. 如果 pcsd 守护进程正在运行，请停止它。

   # systemctl stop pcscd
   Warning: Stopping pcscd.service, but it can still be activated by:
     pcscd.socket

3. 将系统配置为确保 pcsd 守护进程在系统启动时不会重启。

   # systemctl disable pcscd
   Removed /etc/systemd/system/sockets.target.wants/pcscd.socket.

验证

1. 检查 pcscd 守护进程的状态。

   # systemctl status pcscd
   ● pcscd.service - PC/SC Smart Card Daemon
        Loaded: loaded (/usr/lib/systemd/system/pcscd.service; indirect; vendor preset: disabled)
        Active: inactive (dead) since Mon 2021-03-01 17:10:56 IST; 1min 22s ago
   TriggeredBy: ● pcscd.socket
          Docs: man:pcscd(8)
      Main PID: 4494 (code=exited, status=0/SUCCESS)
           CPU: 37ms

2. 确保 Active 参数的值是 inactive (dead)。