diff options
| author | Babu Moger <babu.moger@amd.com> | 2025-09-05 16:34:10 -0500 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2025-09-15 12:12:09 +0200 |
| commit | 8c793336eaf8893a29626155d74615fe9f03e7f2 (patch) | |
| tree | a6f94dee686630e0a0e6cd3334cfbee63e349377 /Documentation/filesystems | |
| parent | 3b497c3f4f0427d940ec5c8600e840c8adc5cfbf (diff) | |
fs/resctrl: Add resctrl file to display number of assignable counters
The "mbm_event" counter assignment mode allows users to assign a hardware
counter to an RMID, event pair and monitor bandwidth usage as long as it is
assigned. The hardware continues to track the assigned counter until it is
explicitly unassigned by the user.
Create 'num_mbm_cntrs' resctrl file that displays the number of counters
supported in each domain. 'num_mbm_cntrs' is only visible to user space when
the system supports "mbm_event" mode.
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 | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst index b692829fec5f..4eb27530be6f 100644 --- a/Documentation/filesystems/resctrl.rst +++ b/Documentation/filesystems/resctrl.rst @@ -288,6 +288,17 @@ with the following files: result in misleading values or display "Unavailable" if no counter is assigned to the event. +"num_mbm_cntrs": + The maximum number of counters (total of available and assigned counters) in + each domain when the system supports mbm_event mode. + + For example, on a system with maximum of 32 memory bandwidth monitoring + counters in each of its L3 domains: + :: + + # cat /sys/fs/resctrl/info/L3_MON/num_mbm_cntrs + 0=32;1=32 + "max_threshold_occupancy": Read/write file provides the largest value (in bytes) at which a previously used LLC_occupancy |