Purge unpinned ashmem before parsing /proc/$pid/smaps.

tools/android/purge_ashmem/purge_ashmem.c

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "third_party/ashmem/ashmem.h"
+
+int main(void) {
+  const int pages_purged = ashmem_purge_all();
+  if (pages_purged < 0) {
+    perror("ashmem_purge_all");
+    return EXIT_FAILURE;
+  }
+  printf("Purged %d pages (%d KBytes)\n",
+         pages_purged, pages_purged * getpagesize() / 1024);
+  return EXIT_SUCCESS;
+}