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fs/resctrl: Document that automatic counter assignment is best effort

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When using automatic counter assignment it's useful for a user to know
which counters they can expect to be assigned on group creation.

Document that automatic counter assignment is best effort and how to
discover any assignment failures.

Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/20260506082855.3694761-1-ben.horgan@arm.com
This commit is contained in:
Ben Horgan 2026-05-06 09:28:54 +01:00 committed by Borislav Petkov (AMD)
parent 3aec86e4ea
commit 9a1646211f
1 changed files with 6 additions and 0 deletions
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6
Documentation/filesystems/resctrl.rst
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@ -479,6 +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