Why Kernel-3.10.0-1160.el7 consumes double amount of memory compared to kernel-3.10.0-1127.el7?

Solution Verified - Updated -

Issue

  • Why Kernel-3.10.0-1160.el7 consumes double amount of memory compared to kernel-3.10.0-1127.el7?
  • why memory allocated by page_cgroup is more than double in RHEL7.9 kernel compared to RHEL7.8
# uname -r 
3.10.0-1127.el7.x86_64

# free -m
              total        used        free      shared  buff/cache   available
Mem:         128677        1246      127029          13         402      126894
Swap:          4095           0        4095

# journalctl -b|grep page_cgroup
Oct 20 01:52:35 HOSTNAME kernel: allocated 536870912 bytes of page_cgroup     <<<<  512M


# uname -r
3.10.0-1160.2.2.el7.x86_64

# free -m
              total        used        free      shared  buff/cache   available
Mem:         128677        4063      124215          13         398      124076
Swap:          4095           0        4095

[root@dell-r430-11 ~]# journalctl -b|grep page_cgroup
Oct 20 00:38:53 HOSTNAME kernel: allocated 3489660928 bytes of page_cgroup     <<<<    3328M

Environment

  • RHEL7.9
  • kernel-3.10.0-1160.el7

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