The following commit has been merged into the x86/cache branch of tip: Commit-ID: faf6ef673787956ec4d33ac8bf56f8ea929abf37 Gitweb: https://git.kernel.org/tip/faf6ef673787956ec4d33ac8bf56f8ea929abf37 Author: Tony Luck <tony.luck@xxxxxxxxx> AuthorDate: Fri, 06 Dec 2024 08:31:48 -08:00 Committer: Borislav Petkov (AMD) <bp@xxxxxxxxx> CommitterDate: Thu, 12 Dec 2024 11:27:43 +01:00 x86/resctrl: Document the new "mba_MBps_event" file 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@xxxxxxxxx> Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx> Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx> Tested-by: Babu Moger <babu.moger@xxxxxxx> Link: https://lore.kernel.org/r/20241206163148.83828-9-tony.luck@xxxxxxxxx --- Documentation/arch/x86/resctrl.rst | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst index a824aff..6768fc1 100644 --- a/Documentation/arch/x86/resctrl.rst +++ b/Documentation/arch/x86/resctrl.rst @@ -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 -------------------------
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