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Commit 165d3ad8 authored by Tony Luck's avatar Tony Luck Committed by Thomas Gleixner
Browse files

x86/intel_rdt: Add documentation for "info/last_cmd_status" 



New file in the "info" directory helps diagnose what went wrong
when using the /sys/fs/resctrl file system

Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Vikas Shivappa <vikas.shivappa@intel.com>
Cc: Boris Petkov <bp@suse.de>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lkml.kernel.org/r/387e78e444582403c2454479e576caf5721a363f.1506382469.git.tony.luck@intel.com
parent cfd0f34e

Documentation/x86/intel_rdt_ui.txt

+11 −0
Original line number Diff line number Diff line
@@ -87,6 +87,17 @@ with the following files: 
			bytes) at which a previously used LLC_occupancy

			counter can be considered for re-use.



Finally, in the top level of the "info" directory there is a file

named "last_cmd_status". This is reset with every "command" issued

via the file system (making new directories or writing to any of the

control files). If the command was successful, it will read as "ok".

If the command failed, it will provide more information that can be

conveyed in the error returns from file operations. E.g.



	# echo L3:0=f7 > schemata

	bash: echo: write error: Invalid argument

	# cat info/last_cmd_status

	mask f7 has non-consecutive 1-bits



Resource alloc and monitor groups

---------------------------------