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-rw-r--r--Documentation/filesystems/resctrl.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst
index 446736dbd97f..4c24c5f3f4c1 100644
--- a/Documentation/filesystems/resctrl.rst
+++ b/Documentation/filesystems/resctrl.rst
@@ -434,6 +434,12 @@ When monitoring is enabled all MON groups will also contain:
for the L3 cache they occupy). These are named "mon_sub_L3_YY"
where "YY" is the node number.
+ When the 'mbm_event' counter assignment mode is enabled, reading
+ an MBM event of a MON group returns 'Unassigned' if no hardware
+ counter is assigned to it. For CTRL_MON groups, 'Unassigned' is
+ returned if the MBM event does not have an assigned counter in the
+ CTRL_MON group nor in any of its associated MON groups.
+
"mon_hw_id":
Available only with debug option. The identifier used by hardware
for the monitor group. On x86 this is the RMID.