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| author | Tony Luck <tony.luck@intel.com> | 2017-09-25 16:39:38 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-09-27 12:10:11 +0200 |
| commit | 165d3ad884df4b30c3564a478b457b499345886f (patch) | |
| tree | 6063e0c2b5f500edb57c0f8d9575d22aa8acd8b6 | |
| parent | cfd0f34e4cd5f1a5ad7000a3104c37886a70bca9 (diff) | |
| download | linux-165d3ad884df4b30c3564a478b457b499345886f.tar.bz2 | |
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
| -rw-r--r-- | Documentation/x86/intel_rdt_ui.txt | 11 |
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 --------------------------------- |