pid1: drop unit caches only based on mtime

v2:
- do not watch mtime of transient and generated dirs

  We'd reload the map after every transient unit we created, which we don't
  need to do, since we create those units ourselves and know their fragment
  path.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/core/manager.h b/src/core/manager.h
index 3cb37b3bf4..596220848f 100644
--- a/src/core/manager.h
+++ b/src/core/manager.h
@@ -224,6 +224,7 @@ struct Manager {
         Hashmap *unit_id_map;
         Hashmap *unit_name_map;
         Set *unit_path_cache;
+        usec_t unit_cache_mtime;
 
         char **transient_environment;  /* The environment, as determined from config files, kernel cmdline and environment generators */
         char **client_environment;     /* Environment variables created by clients through the bus API */