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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-14 06:05:19 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-14 06:05:19 +0300 |
| commit | 3643b7e05b16a9fc4077ec56b655a1f8547d259c (patch) | |
| tree | eaa3a14a60082a374591ae6f7a44f29121d65c30 /Documentation/x86 | |
| parent | b18d62891aaff49d0ee8367d4b6bb9452469f807 (diff) | |
| parent | 2244645ab194fe45ffcbaa08f235c8f0c7fb54fc (diff) | |
| download | linux-3643b7e05b16a9fc4077ec56b655a1f8547d259c.tar.xz | |
Merge branch 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 cache resource updates from Thomas Gleixner:
"This update provides updates to RDT:
- A diagnostic framework for the Resource Director Technology (RDT)
user interface (sysfs). The failure modes of the user interface are
hard to diagnose from the error codes. An extra last command status
file provides now sensible textual information about the failure so
its simpler to use.
- A few minor cleanups and updates in the RDT code"
* 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/intel_rdt: Fix a silent failure when writing zero value schemata
x86/intel_rdt: Fix potential deadlock during resctrl mount
x86/intel_rdt: Fix potential deadlock during resctrl unmount
x86/intel_rdt: Initialize bitmask of shareable resource if CDP enabled
x86/intel_rdt: Remove redundant assignment
x86/intel_rdt/cqm: Make integer rmid_limbo_count static
x86/intel_rdt: Add documentation for "info/last_cmd_status"
x86/intel_rdt: Add diagnostics when making directories
x86/intel_rdt: Add diagnostics when writing the cpus file
x86/intel_rdt: Add diagnostics when writing the tasks file
x86/intel_rdt: Add diagnostics when writing the schemata file
x86/intel_rdt: Add framework for better RDT UI diagnostics
Diffstat (limited to 'Documentation/x86')
| -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 --------------------------------- |