No Data Collected on Certain Tab Pages During Memory Access Analysis on CentOS 7.6 (Standard Kernel)

Symptom

Data about the DDR access bandwidth, L3C access bandwidth, and hit ratio is not collected when a memory access statistics analysis task is executed on CentOS 7.6 (standard kernel).

Possible Cause

SELinux is enabled in the current system and the driver for collecting data cannot be installed. Disable SELinux before using this function.

Troubleshooting Procedure

• Disabling SELinux temporarily
  1. Run the sestatus command to query the SELinux status. If the value of Current mode is enforcing, the SELinux enforcing mode is enabled.
  2. Set the SELinux mode to permissive:

     1	setenforce 0

  3. Run the sestatus command to query the SELinux status. If the value of Current mode is permissive, the SELinux enforcing mode is disabled temporarily.
  

  The setting becomes invalid after the server is rebooted. When the tool is used, service exceptions may occur.

• Disabling SELinux permanently
  1. Run the sestatus command to query the SELinux status. If SELinux status is enabled, SELinux is enabled.
  2. Run the following command to open the /etc/selinux/config file:

     1	vi /etc/selinux/config

  3. Press i to enter the insert mode and change SELINUX=enforcing to SELINUX=disabled.
  4. Press Esc, type :wq!, and press Enter to save the file and exit.
  5. Run the reboot command to reboot the server.
  6. Run the sestatus command to query the SELinux status. If SELinux status is disabled, SELinux is disabled.