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

third_party/ashmem/ashmem-dev.c

Index: third_party/ashmem/ashmem-dev.c
diff --git a/third_party/ashmem/ashmem-dev.c b/third_party/ashmem/ashmem-dev.c
index 1cfdfe0761313d08cc61bf7faa8c3895c7130f2e..2303369d81678af9a3c351040419b9d2e6e39b79 100644
--- a/third_party/ashmem/ashmem-dev.c
+++ b/third_party/ashmem/ashmem-dev.c
@@ -88,3 +88,13 @@ 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;
+}