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fs/resctrl: Provide interface to update the event configurations

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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
This commit is contained in:
Babu Moger
2025-09-05 16:34:24 -05:00
committed by Borislav Petkov (AMD)
parent ea274cbeaf
commit f9ae5913d4
4 changed files with 131 additions and 1 deletions
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12
Documentation/filesystems/resctrl.rst
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@@ -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