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-rw-r--r--docs/ENVIRONMENT.md7
1 files changed, 7 insertions, 0 deletions
diff --git a/docs/ENVIRONMENT.md b/docs/ENVIRONMENT.md
index 01ee065583..604d1a6232 100644
--- a/docs/ENVIRONMENT.md
+++ b/docs/ENVIRONMENT.md
@@ -283,6 +283,13 @@ All tools:
type as unsupported may not prevent loading some units of that type if they
are referenced by other units of another supported type.
+* `$SYSTEMD_DEFAULT_MOUNT_RATE_LIMIT_BURST` — can be set to override the mount
+ units burst rate limit for parsing `/proc/self/mountinfo`. On a system with
+ few resources but many mounts the rate limit may be hit, which will cause the
+ processing of mount units to stall. The burst limit may be adjusted when the
+ default is not appropriate for a given system. Defaults to `5`, accepts
+ positive integers.
+
`systemd-remount-fs`:
* `$SYSTEMD_REMOUNT_ROOT_RW=1` — if set and no entry for the root directory