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

third_party/ashmem/ashmem-dev.c

 /*
  * Copyright (C) 2008 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
@@ skipping 70 matching lines @@
 int ashmem_unpin_region(int fd, size_t offset, size_t len)
 {
         struct ashmem_pin pin = { offset, len };
         return ioctl(fd, ASHMEM_UNPIN, &pin);
 }
 
 int ashmem_get_size_region(int fd)
 {
   return ioctl(fd, ASHMEM_GET_SIZE, NULL);
 }
+
+int ashmem_purge_all(void)
+{
+  const int fd = open(ASHMEM_DEVICE, O_RDWR);
+  if (fd < 0)
+    return fd;
+  const int ret = ioctl(fd, ASHMEM_PURGE_ALL_CACHES, 0);
+  close(fd);
+  return ret;
+}