meminfo.sh

#!/bin/bash

case "$1" in

-g)
  UNITS_DIV="/1024/1024"
  UNITS="GB"
  ;;
-m)
  UNITS_DIV="/1024"
  UNITS="MB"
  ;;
-k)
  UNITS_DIV=""
  UNITS="kB"
  ;;
*)
  UNITS_DIV="/1024"
  UNITS="MB"
esac

mem_total=$((`cat /proc/meminfo | awk '/^MemTotal/ { print $2; }'`$UNITS_DIV))
mem_free=$((`cat /proc/meminfo | awk '/^MemFree/ { print $2; }'`$UNITS_DIV))
swap_free=$((`cat /proc/meminfo | awk '/^SwapFree/ { print $2; }'`$UNITS_DIV))
swap_total=$((`cat /proc/meminfo | awk '/^SwapTotal/ { print $2; }'`$UNITS_DIV))

slab_size=$((`cat /proc/meminfo | awk '/^Slab/ { print $2; }'`$UNITS_DIV))
dcache_size=$((`cat /proc/meminfo | awk '/^Cached/ { print $2; }'`$UNITS_DIV))
swapcache_size=$((`cat /proc/meminfo | awk '/^SwapCached/ { print $2; }'`$UNITS_DIV))
buffers_size=$((`cat /proc/meminfo | awk '/^Buffers/ { print $2; }'`$UNITS_DIV))
mem_free_no_cache=$(( $mem_free + $swapcache_size + $buffers_size))
zfs_arc_shrink_shift=`cat /sys/module/zfs/parameters/zfs_arc_shrink_shift`
zfs_arc_shrink_size=$(( $mem_total / (1<<$zfs_arc_shrink_shift) ))
swap_used=$(( $swap_total - $swap_free ))

pages_shared=$(cat /sys/kernel/mm/ksm/pages_shared)
pages_sharing=$(cat /sys/kernel/mm/ksm/pages_sharing)
pages_unshared=$(cat /sys/kernel/mm/ksm/pages_unshared)
pages_volatile=$(cat /sys/kernel/mm/ksm/pages_volatile)
page_size=$(getconf PAGESIZE)
ratio_sharing_to_shared=$(echo "scale=2;$pages_sharing / $pages_shared"|bc);
ratio_unshared_to_sharing=$(echo "scale=2;$pages_unshared / $pages_sharing"|bc);
ksm_saved=$(echo "scale=0;$pages_sharing * $page_size / 1024"|bc);
ksm_saved=$(($ksm_saved $UNITS_DIV))

if [ -d /proc/spl/kstat/zfs ]; then
  arc_size=$((`cat /proc/spl/kstat/zfs/arcstats | awk '/^size/ { print $3; }'`/1024$UNITS_DIV))
  arc_mfu_size=$((`cat /proc/spl/kstat/zfs/arcstats | awk '/^mfu_size/ { print $3; }'`/1024$UNITS_DIV))
  arc_mfu_ghost_size=$((`cat /proc/spl/kstat/zfs/arcstats | awk '/^mfu_ghost_size/ { print $3; }'`/1024$UNITS_DIV))
  arc_mru_size=$((`cat /proc/spl/kstat/zfs/arcstats | awk '/^mru_size/ { print $3; }'`/1024$UNITS_DIV))
  arc_mru_ghost_size=$((`cat /proc/spl/kstat/zfs/arcstats | awk '/^mru_ghost_size/ { print $3; }'`/1024$UNITS_DIV))

  arc_hits=$(grep '^hits' /proc/spl/kstat/zfs/arcstats | awk '{print $3}')
  arc_misses=$(grep '^misses' /proc/spl/kstat/zfs/arcstats | awk '{print $3}')
  arc_total=$(($arc_hits + $arc_misses))
  arc_hit_rate=$(($arc_hits * 100 / $arc_total))
fi

printf "mem_total             %12s $UNITS\n" $mem_total
printf "slab_size             %12s $UNITS\n" $slab_size
printf "dcache_size           %12s $UNITS\n" $dcache_size
printf "swapcache_size        %12s $UNITS\n" $swapcache_size
printf "buffers_size          %12s $UNITS\n" $buffers_size
printf "arc_size              %12s $UNITS\n" $arc_size
printf "arc_mfu_size          %12s $UNITS\n" $arc_mfu_size
printf "arc_mfu_ghost_size    %12s $UNITS\n" $arc_mfu_ghost_size
printf "arc_mru_size          %12s $UNITS\n" $arc_mru_size
printf "arc_mru_ghost_size    %12s $UNITS\n" $arc_mru_ghost_size
printf "zfs_arc_shrink_size   %12s $UNITS\n" $zfs_arc_shrink_size
printf "mem_free              %12s $UNITS\n" $mem_free
printf "mem_free_no_cache     %12s $UNITS\n" $mem_free_no_cache
printf "mem_swap_free         %12s $UNITS\n" $swap_free
printf "mem_swap_used         %12s $UNITS\n" $swap_used

printf "ksm_saved             %12s $UNITS\n" $ksm_saved
printf "ksm_shared            %12s\n" $pages_shared
printf "ksm_sharing           %12s\n" $pages_sharing
printf "ksm_unsuared          %12s\n" $pages_unshared
printf "ksm_volatile          %12s\n" $pages_volatile
printf "ksm_sharing_ratio     %12s %%\n" $ratio_sharing_to_shared
printf "ksm_unshared_ratio    %12s %%\n" $ratio_unshared_to_sharing

if [ -d /proc/spl/kstat/zfs ]; then
  printf "arc_hits              %12s\n" $arc_hits
  printf "arc_misses            %12s\n" $arc_misses
  printf "arc_hit_rate          %12s %%\n" $arc_hit_rate
fi