From: Tony Luck Date: Mon, 25 Sep 2017 23:39:38 +0000 (-0700) Subject: x86/intel_rdt: Add documentation for "info/last_cmd_status" X-Git-Tag: Ubuntu-5.13.0-19.19~12227^2~6 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=165d3ad884df4b30c3564a478b457b499345886f;p=mirror_ubuntu-jammy-kernel.git 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 Signed-off-by: Thomas Gleixner Cc: Fenghua Yu Cc: Steven Rostedt Cc: Vikas Shivappa Cc: Boris Petkov Cc: Reinette Chatre Link: https://lkml.kernel.org/r/387e78e444582403c2454479e576caf5721a363f.1506382469.git.tony.luck@intel.com --- 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 ---------------------------------