diff -r 000000000000 -r 6474c204b198 build/link.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/build/link.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,53 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import with_statement
+import os, subprocess, sys, threading, time
+from win32 import procmem
+
+def measure_vsize_threadfunc(proc, output_file):
+    """
+    Measure the virtual memory usage of |proc| at regular intervals
+    until it exits, then print the maximum value and write it to
+    |output_file|.  Also, print something to the console every
+    half an hour to prevent the build job from getting killed when
+    linking a large PGOed binary.
+    """
+    maxvsize = 0
+    idleTime = 0
+    while proc.returncode is None:
+        maxvsize, vsize = procmem.get_vmsize(proc._handle)
+        time.sleep(0.5)
+        idleTime += 0.5
+        if idleTime > 30 * 60:
+          print "Still linking, 30 minutes passed..."
+          sys.stdout.flush()
+          idleTime = 0
+    print "TinderboxPrint: linker max vsize: %d" % maxvsize
+    with open(output_file, "w") as f:
+        f.write("%d\n" % maxvsize)
+
+def measure_link_vsize(output_file, args):
+    """
+    Execute |args|, and measure the maximum virtual memory usage of the process,
+    printing it to stdout when finished.
+    """
+    proc = subprocess.Popen(args)
+    t = threading.Thread(target=measure_vsize_threadfunc,
+                         args=(proc, output_file))
+    t.start()
+    # Wait for the linker to finish.
+    exitcode = proc.wait()
+    # ...and then wait for the background thread to finish.
+    t.join()
+    return exitcode
+
+if __name__ == "__main__":
+    if sys.platform != "win32":
+        print >>sys.stderr, "link.py is only for use on Windows!"
+        sys.exit(1)
+    if len(sys.argv) < 3:
+        print >>sys.stderr, "Usage: link.py <output filename> <commandline>"
+        sys.exit(1)
+    sys.exit(measure_link_vsize(sys.argv[1], sys.argv[2:]))