Reload cache factors from disk on SIGHUP (#12673)

1 files changed, 17 insertions, 0 deletions

diff --git a/docs/usage/configuration/config_documentation.md b/docs/usage/configuration/config_documentation.md

index 21dad0ac41..f292b94fb0 100644
--- a/docs/usage/configuration/config_documentation.md
+++ b/docs/usage/configuration/config_documentation.md
@@ -1130,6 +1130,23 @@ caches:
   expire_caches: false
   sync_response_cache_duration: 2m
 ```
+
+### Reloading cache factors
+
+The cache factors (i.e. `caches.global_factor` and `caches.per_cache_factors`)  may be reloaded at any time by sending a
+[`SIGHUP`](https://en.wikipedia.org/wiki/SIGHUP) signal to Synapse using e.g.
+
+```commandline
+kill -HUP [PID_OF_SYNAPSE_PROCESS]
+```
+
+If you are running multiple workers, you must individually update the worker 
+config file and send this signal to each worker process.
+
+If you're using the [example systemd service](https://github.com/matrix-org/synapse/blob/develop/contrib/systemd/matrix-synapse.service)
+file in Synapse's `contrib` directory, you can send a `SIGHUP` signal by using
+`systemctl reload matrix-synapse`.
+
 ---
 ## Database ##
 Config options related to database settings.