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x86/resctrl: Document the new "mba_MBps_event" file

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Add a section to document a new read/write file that shows/sets the memory
bandwidth event used to control bandwidth used by each CTRL_MON group.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20241206163148.83828-9-tony.luck@intel.com
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Tony Luck 2024-12-06 08:31:48 -08:00 committed by Borislav Petkov (AMD)
parent 8e931105ac
commit faf6ef6737
1 changed files with 10 additions and 0 deletions
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Documentation/arch/x86/resctrl.rst
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@ -384,6 +384,16 @@ When monitoring is enabled all MON groups will also contain:
Available only with debug option. The identifier used by hardware
for the monitor group. On x86 this is the RMID.
When the "mba_MBps" mount option is used all CTRL_MON groups will also contain:
"mba_MBps_event":
Reading this file shows which memory bandwidth event is used
as input to the software feedback loop that keeps memory bandwidth
below the value specified in the schemata file. Writing the
name of one of the supported memory bandwidth events found in
/sys/fs/resctrl/info/L3_MON/mon_features changes the input
event.
Resource allocation rules
-------------------------