Large amount of kmalloc-32 slab cache usage leading to OOM issue.

Issue

• Continuous growth of UN-reclaimable slab usage of kmalloc-32 object upon starting the cohesity application.

$ grep -A2 ^Sl proc/meminfo 
Slab:           18358632 kB
SReclaimable:     669856 kB
SUnreclaim:     17688776 kB

$ cat proc/slabinfo |awk '{printf "%7i MiB : %s\n",$6*$(NF-1)/256,$1}'|sort -nk 1 -r|head -5
  15881 MiB : kmalloc-32
    487 MiB : kmalloc-4k
    316 MiB : kmalloc-2k
    203 MiB : ext4_inode_cache
    149 MiB : mnt_cache

• At the time of OOM event, the kmalloc-32 usage is very high and leading to OOM.

NAME                                TOTAL OBJSIZE
kmalloc-32                     84740940 K      32   <<<----