IT20450: MEMORY STATISTICS ARE NOT OK

APAR status

• Closed as program error.

Error description

• The values for the memory info used in the WebUI and the memory
  monitoring output are retrieved from /proc/meminfo.  On a
  non-docker
  setup that usually results in:
  
  MemoryTotalBytes derived from: MemTotal * 1024
  MemoryFreeBytes derived from:
  ( MemFree + Buffers + Cached - Shmem ) if ( Cached > Shmem ) *
  1024
  ( MemFree + Buffers ) if ( Cached < Shmem ) * 1024
  
  where MemTotal, MemFree, Buffers, Cache and Shmem are all taken
  directly from /proc/meminfo.
  
  This will be changed in order to look at available memory from
  /proc/meminfor
  

Local fix

• run sync; echo 3 > /proc/sys/vm/drop_caches in order to free up
  more memory
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of MessaheSight V2.0 Server/WebUI
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  When available memory is calculated, we add the value of
  "Buffers" and "Cache" to "MemFree" (all from /proc/meminfo), but
  we don't add "SReclaimable" so it can appear we've run out of
  memory when we haven't.
  

Problem conclusion

• Use SReclaimable when reading /proc/meminfo and adding that to
  the count of free memory for correct output
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  MSGSIGHT VIRT E

• Fixed component ID

  5725S1700

Applicable component levels