Wait with bash for some amount of memory (MemAvailable) to be available

wait_for_mem_available.sh

#!/bin/bash

# Wait for MemAvailable to be bigger than a certain value.
#
# $1 - Value in kb that MemAvailable should be greater than.
# $2 - (Optional, Default=60) Timeout in seconds
#
# Examples
#
#   wait_for_mem_available 10000000 120
wait_for_mem_available() {
  REQUESTED_MEMORY_KB=$1
  TIMEOUT_DURATION=$((${2:-60}))
  TIMEOUT_END=$((SECONDS+TIMEOUT_DURATION))

  while true; do
    mem_available=$(grep MemAvailable /proc/meminfo | awk '{ print $2 }')

    if [ $SECONDS -gt $TIMEOUT_END ]; then
      echo "Stopped waiting for $REQUESTED_MEMORY_KB kb MemAvailable after $SECONDS seconds (MemAvailable=$mem_available kb)"
      break
    fi

    if [ "$mem_available" -gt "$REQUESTED_MEMORY_KB" ]; then
      break
    fi

    sleep 1
  done
}