tools: add tools/rpi_mem_usage.sh script

tools/rpi_mem_usage.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+get_mem() {
+  local mem=$(vcgencmd get_mem "$1" | cut -d= -f2)
+  shift
+  echo -e "$@\t\t$mem"
+}
+
+(
+  get_mem arm "Total ARM"
+  get_mem gpu "Total GPU"
+  get_mem malloc_total "GPU Malloc"
+  get_mem malloc "GPU Malloc Free"
+  get_mem reloc_total "GPU Reloc"
+  get_mem reloc "GPU Reloc Free"
+  cat /sys/kernel/debug/vcsm-cma/state | grep "SIZE" | awk '{s+=$2} END {printf("CMA\t\t\t%.1fMB\n", s/1024/1024)}'
+)
+
+echo "--------"
+vcdbg reloc | sed -s 's/^/reloc: /'
+
+echo "--------"
+vcdbg malloc | sed -s 's/^/maloc: /'
+echo "--------"
+cat /sys/kernel/debug/vcsm-cma/state | sed -s 's/^/cma: /'
+echo "--------"