diff options
| author | Babu Moger <babu.moger@amd.com> | 2025-09-05 16:34:24 -0500 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2025-09-15 12:40:38 +0200 |
| commit | f9ae5913d47cda67481a4f54cc3273d3d1d00a01 (patch) | |
| tree | cf0b80a79a83fa64419e2a883b8d20a50ee41a8d /Documentation/filesystems | |
| parent | ea274cbeaf8f0667267b347e3f84797439cdab4e (diff) | |
fs/resctrl: Provide interface to update the event configurations
When "mbm_event" counter assignment mode is enabled, users can modify the
event configuration by writing to the 'event_filter' resctrl file. The event
configurations for mbm_event mode are located in
/sys/fs/resctrl/info/L3_MON/event_configs/.
Update the assignments of all CTRL_MON and MON resource groups when the event
configuration is modified.
Example:
$ mount -t resctrl resctrl /sys/fs/resctrl
$ cd /sys/fs/resctrl/
$ cat info/L3_MON/event_configs/mbm_local_bytes/event_filter
local_reads,local_non_temporal_writes,local_reads_slow_memory
$ echo "local_reads,local_non_temporal_writes" >
info/L3_MON/event_configs/mbm_total_bytes/event_filter
$ cat info/L3_MON/event_configs/mbm_total_bytes/event_filter
local_reads,local_non_temporal_writes
Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/cover.1757108044.git.babu.moger@amd.com
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/resctrl.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst index ddd95f1472e6..2e840ef26f68 100644 --- a/Documentation/filesystems/resctrl.rst +++ b/Documentation/filesystems/resctrl.rst @@ -343,6 +343,18 @@ 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. + + For example:: + + # echo "local_reads, local_non_temporal_writes" > + /sys/fs/resctrl/info/L3_MON/event_configs/mbm_total_bytes/event_filter + + # cat /sys/fs/resctrl/info/L3_MON/event_configs/mbm_total_bytes/event_filter + local_reads,local_non_temporal_writes + "max_threshold_occupancy": Read/write file provides the largest value (in bytes) at which a previously used LLC_occupancy |