From: Tony Luck Date: Fri, 6 Dec 2024 16:31:48 +0000 (-0800) Subject: x86/resctrl: Document the new "mba_MBps_event" file X-Git-Tag: v6.14-rc1~193^2 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=faf6ef673787956ec4d33ac8bf56f8ea929abf37;p=thirdparty%2Fkernel%2Flinux.git 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 Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Reinette Chatre Tested-by: Babu Moger Link: https://lore.kernel.org/r/20241206163148.83828-9-tony.luck@intel.com --- diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst index a824affd741d1..6768fc1fad166 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 -------------------------