Commit-ID: 165d3ad884df4b30c3564a478b457b499345886f Gitweb: http://git.kernel.org/tip/165d3ad884df4b30c3564a478b457b499345886f Author: Tony Luck <tony.luck@xxxxxxxxx> AuthorDate: Mon, 25 Sep 2017 16:39:38 -0700 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitDate: Wed, 27 Sep 2017 12:10:11 +0200 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@xxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Cc: Vikas Shivappa <vikas.shivappa@xxxxxxxxx> Cc: Boris Petkov <bp@xxxxxxx> Cc: Reinette Chatre <reinette.chatre@xxxxxxxxx> Link: https://lkml.kernel.org/r/387e78e444582403c2454479e576caf5721a363f.1506382469.git.tony.luck@xxxxxxxxx --- Documentation/x86/intel_rdt_ui.txt | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/Documentation/x86/intel_rdt_ui.txt b/Documentation/x86/intel_rdt_ui.txt index 4d8848e..6851854 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 --------------------------------- -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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