Why does RHEL 8 report MemFree value greater than MemTotal in numastat output?

Solution Verified - Updated -

Issue

  • Why does RHEL 8 report MemFree value greater than MemTotal in numastat -m output?

    # numastat -m
...
                          Node 0          Node 1           Total
                 --------------- --------------- ---------------
MemTotal               371354.52       372294.73       743649.25
MemFree                380842.13       384308.93       765151.06
MemUsed         900719925474099290071992547409921801439850948198
...

  • Why does /sys/devices/system/node/node*/meminfo show higher MemFree than MemTotal

    # head -n3 /sys/devices/system/node/node0/meminfo
Node 0 MemTotal:       380267028 kB
Node 0 MemFree:        389982344 kB
Node 0 MemUsed:        18446744073699836300 kB

# head -n3 /sys/devices/system/node/node1/meminfo
Node 1 MemTotal:       381229808 kB
Node 1 MemFree:        393531896 kB
Node 1 MemUsed:        18446744073697249528 kB

  • Why is MemUsed invalid value in numastat & /sys/devices/system/node/node*/meminfo`

Environment

  • Red Hat Enterprise Linux (RHEL) 8
  • Non-Uniform Memory Access (NUMA) system

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