x86/resctrl: Add "mba_MBps_event" file to CTRL_MON directories

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The "mba_MBps" mount option provides an alternate method to control memory
bandwidth. Instead of specifying allowable bandwidth as a percentage of
maximum possible, the user provides a MiB/s limit value.

In preparation to allow the user to pick the memory bandwidth monitoring event
used as input to the feedback loop, provide a file in each CTRL_MON group
directory that shows the event currently in use. Note that this file is only
visible when the "mba_MBps" mount option is in use.

Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
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/20241206163148.83828-7-tony.luck@intel.com

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Tony Luck 2024-12-06 08:31:46 -08:00 • committed by Borislav Petkov (AMD)

parent 141cb5c482

commit f5cd0e316f

3 changed files with 42 additions and 0 deletions

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30

arch/x86/kernel/cpu/resctrl/ctrlmondata.c

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2

arch/x86/kernel/cpu/resctrl/internal.h

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10

arch/x86/kernel/cpu/resctrl/rdtgroup.c

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