Servers running with high CPU / MEM with with slab cache (slab_unreclaimable) in kmalloc-2048

Solution Verified - Updated -

Issue

  • System was suffered with lack of free memory due to large amount of allocation in kmalloc-2048.
$ cat /proc/slabinfo |awk '{printf "%7i MiB : %s\n",$6*$(NF-1)/256,$1}'|sort -nk 1 -r|head -5
   20367 MiB : kmalloc-2048
   2648 MiB : kmalloc-192
   2299 MiB : kmalloc-1024
   1757 MiB : shared_policy_node
   1049 MiB : kmalloc-64

Environment

  • Red Hat Enterprise Linux 7.9
  • 3rd party module falcon_kal was loaded

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