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authorTony Luck <tony.luck@intel.com>2017-09-25 16:39:38 -0700
committerThomas Gleixner <tglx@linutronix.de>2017-09-27 12:10:11 +0200
commit165d3ad884df4b30c3564a478b457b499345886f (patch)
tree6063e0c2b5f500edb57c0f8d9575d22aa8acd8b6 /Documentation/x86
parentcfd0f34e4cd5f1a5ad7000a3104c37886a70bca9 (diff)
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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: Tony Luck <tony.luck@intel.com> Signed-off-by: Thomas 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
Diffstat (limited to 'Documentation/x86')
-rw-r--r--Documentation/x86/intel_rdt_ui.txt11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/x86/intel_rdt_ui.txt b/Documentation/x86/intel_rdt_ui.txt
index 4d8848e4e224..6851854cf69d 100644
--- a/Documentation/x86/intel_rdt_ui.txt
+++ b/Documentation/x86/intel_rdt_ui.txt
@@ -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
---------------------------------