mapstop: Program to output /proc/pid/maps in sorted order by virtsize

Committing as-is quick & dirty program I did a while ago to investigate
process mappings. This was handy for understanding something related to
wendelin.core.

mapstop

+#!/usr/bin/env python
+""" read /prod/pid/maps-like input and sort entries based on amount of
+allocated address space """
+
+import sys
+
+
+# 7fdd3fe01000-7fdd40000000 ... -> 
+def virt_space_amount(arg):
+    addr_range = arg.split()[0]
+    addr_start, addr_stop = addr_range.split('-')
+    addr_start = int(addr_start, 16)
+    addr_stop  = int(addr_stop, 16)
+    return addr_stop - addr_start
+
+KB = 1024
+MB = 1024*KB
+GB = 1024*MB
+def pretty_size(size):
+    if size > GB:
+        return '%.2fGB' % (float(size) / GB)
+    if size > MB:
+        return '%.0fMB' % (float(size) / MB)
+    return '%.0fKB' % (float(size) / KB)
+    
+
+def main():
+    lines = sys.stdin.readlines()
+    #lines.sort(key=virt_space_amount, reverse=True)
+    for _ in lines:
+        print '%8s %s' % (pretty_size(virt_space_amount(_)), _,),
+
+
+
+if __name__ == '__main__':
+    main()