logging: add log level cache

This ensures multithreaded logging attempts, in particular ones that do
nothing, do not hold the lock just for checking the level, which
interferes with other logging attempts.

Closes: OS#5818

Change-Id: I35f8dd9127dd6e7feae392094fd6b3ce2d32558d

1 files changed, 7 insertions, 0 deletions

diff --git a/src/vty/logging_vty.c b/src/vty/logging_vty.c
index 2a074222..678ae686 100644
--- a/src/vty/logging_vty.c
+++ b/src/vty/logging_vty.c
@@ -382,6 +382,10 @@ DEFUN(logging_level,
 	tgt->categories[category].enabled = 1;
 	tgt->categories[category].loglevel = level;
 
+#if !defined(EMBEDDED)
+	log_cache_update(category, 1, level);
+#endif
+
 	RET_WITH_UNLOCK(CMD_SUCCESS);
 }
 
@@ -406,6 +410,9 @@ DEFUN(logging_level_set_all, logging_level_set_all_cmd,
 
 		cat->enabled = 1;
 		cat->loglevel = level;
+#if !defined(EMBEDDED)
+		log_cache_update(i, 1, level);
+#endif
 	}
 	RET_WITH_UNLOCK(CMD_SUCCESS);
 }