[PATCH v4 0/7] x86/resctrl: Miscellaneous resctrl features

Babu Moger
2023-04-17T23:34:22Z

These series adds support few minor features.
1. Support assigning multiple tasks to control/mon groups in one command.
2. Add debug mount option for resctrl interface.
3. Add RMID and CLOSID in resctrl interface when mounted with debug option.
4. While doing these above changes, found that rftype flags needed some cleanup.
They were named inconsistently. Re-arranged them much more cleanly now.
Hope it can help future additions.

---
v4: Changes since v3
Addressed comments from Reinette and others.
Removed newline requirement when adding tasks.
Dropped one of the changes on flags. Kept the flag names mostly same.
Changed the names of closid and rmid to ctrl_hw_id and mon_hw_id respectively.
James had some concerns about adding these files. But I thing it is big problem.
Please comment back if we can do better.
Tried to address Reinette's comment on patch 7. But due to current code design
I could not do it exact way. But changed it little bit to make it easy debug
file additions in the future.

v3: Changes since v2
Still waiting for more comments. While waiting, addressed few comments from Fenghua.
Added few more texts in the documentation about multiple tasks assignment feature.
Added pid in last_cmd_status when applicable.
Introduced static resctrl_debug to save the debug option.
Few minor text changes.

v2: Changes since v1
a. Removed the changes to add the task's threads automatically. It required
book keeping to handle the failures and gets complicated. Removed that change
for now.
b. Added -o debug option to mount in debug mode(comment from Fenghua)
c. Added debug files rmid and closid. Stephane wanted to rename them more
generic to accommodate ARM. It kind of loses meaning if is renamed differently.
Kept it same for now. Will change if he feels strong about it.

v3: https://lore.kernel.org/lkml/167778850105.1053859.14596357862185564029.stgit@bmoger-ubuntu/
v2: https://lore.kernel.org/lkml/167537433143.647488.9641864719195184123.stgit@bmoger-ubuntu/
v1: https://lore.kernel.org/lkml/167278351577.34228.12803395505584557101.stgit@bmoger-ubuntu/

Babu Moger (7):
x86/resctrl: Add multiple tasks to the resctrl group at once
x86/resctrl: Remove unnecessary rftype flags
x86/resctrl: Rename rftype flags for consistency
x86/resctrl: Re-arrange RFTYPE flags and add more comments
x86/resctrl: Introduce "-o debug" mount option
x86/resctrl: Display CLOSID and RMID for the resctrl groups
x86/resctrl: Add debug files when mounted with debug option

Documentation/x86/resctrl.rst | 29 +++-
arch/x86/kernel/cpu/resctrl/internal.h | 62 ++++++--
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 188 ++++++++++++++++++++++---
3 files changed, 243 insertions(+), 36 deletions(-)

--