diff options
Diffstat (limited to 'Documentation/filesystems/resctrl.rst')
| -rw-r--r-- | Documentation/filesystems/resctrl.rst | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst index b003bed339fd..e4b66af55ffb 100644 --- a/Documentation/filesystems/resctrl.rst +++ b/Documentation/filesystems/resctrl.rst @@ -427,9 +427,9 @@ with the following files: Two MBM events are supported by default: mbm_local_bytes and mbm_total_bytes. Each MBM event's sub-directory contains a file named "event_filter" that is - used to view and modify which memory transactions the MBM event is configured - with. The file is accessible only when "mbm_event" counter assignment mode is - enabled. + used to view and (if writable) modify which memory transactions the MBM event + is configured with. The file is accessible only when "mbm_event" counter + assignment mode is enabled. List of memory transaction types supported: @@ -454,9 +454,8 @@ with the following files: # cat /sys/fs/resctrl/info/L3_MON/event_configs/mbm_local_bytes/event_filter local_reads,local_non_temporal_writes,local_reads_slow_memory - Modify the event configuration by writing to the "event_filter" file within - the "event_configs" directory. The read/write "event_filter" file contains the - configuration of the event that reflects which memory transactions are counted by it. + The memory transactions the MBM event is configured with can be changed + if "event_filter" is writable. For example:: @@ -480,6 +479,12 @@ with the following files: "1": Auto assignment is enabled. + Automatic counter assignment is done with best effort. If auto + assignment is enabled but there are not enough available counters then + monitor group creation could succeed while one or more events belonging + to the group may not have a counter assigned in all domains. Consult + mbm_L3_assignments for counter assignment states of the new groups. + Example:: # echo 0 > /sys/fs/resctrl/info/L3_MON/mbm_assign_on_mkdir @@ -570,6 +575,11 @@ All groups contain the following files: then the task must already belong to the CTRL_MON parent of this group. The task is removed from any previous MON group. + When writing to this file, a task id of 0 is interpreted as the + task id of the currently running task. On reading the file, a task + id of 0 will never be shown and there is no representation of the + idle tasks. Instead, a CPU's idle task is always considered as a + member of the group owning the CPU. "cpus": Reading this file shows a bitmask of the logical CPUs owned by |