[PATCH v8 00/21] x86/resctrl: Move the resctrl filesystem code to /fs/resctrl

James Morse
2025-04-11T16:42:42Z

Changes since v7:
* Switched to Tony's alternative for having a structure behind struct
mon_data.

Changes otherwise noted on each patch.

N.B, the disk in my machine recently died - so I've re-done the feedback
changes multiple times. Appologies if I missed something on the second pass!
---
Patch 1 has been posted as a fix that should get picked up independently.

Patches X-Y should be squashed together when merged - they are posted like
this to allow folk to re-generate patch N, then review the differences on
top. Not squashing them together would expose a ftrace build warning
during bisect. (but who does that!)
That would look like this:
git://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/move_to_fs/v8_final

This series is based on rc1, and can be retrieved from:
git://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/move_to_fs/v8

This series renames functions and moves code around. With the
exception of invalid configurations for the configurable-events, there should
be no changes in behaviour caused by this series. It is now possible for
throttle_mode to report 'undefined', but no known platform will do this.

The driving pattern is to make things like struct rdtgroup private to resctrl.
Features like pseudo-lock aren't going to work on arm64, the ability to disable
it at compile time is added.

After this, I can start posting the MPAM driver to make use of resctrl on arm64.
(What's MPAM? See the cover letter of the first series. [1])

As ever - bugs welcome,
Thanks,

James

[v7] https://lore.kernel.org/all/20250228195913.24895-1-james.morse@arm.com/
[v6] https://lore.kernel.org/lkml/20250207181823.6378-1-james.morse@arm.com/
[v5] https://lore.kernel.org/r/20241004180347.19985-1-james.morse@arm.com
[v4] https://lore.kernel.org/all/20240802172853.22529-1-james.morse@arm.com/
[v3] https://lore.kernel.org/r/20240614150033.10454-1-james.morse@arm.com
[v2] https://lore.kernel.org/r/20240426150537.8094-1-Dave.Martin@arm.com
[v1] https://lore.kernel.org/r/20240321165106.31602-1-james.morse@arm.com
[1] https://lore.kernel.org/lkml/20201030161120.227225-1-james.morse@arm.com/

Amit Singh Tomar (1):
x86/resctrl: Remove the limit on the number of CLOSID

Dave Martin (3):
x86/resctrl: Squelch whitespace anomalies in resctrl core code
x86/resctrl: Prefer alloc(sizeof(*foo)) idiom in rdt_init_fs_context()
x86/resctrl: Relax some asm #includes

James Morse (17):
x86/resctrl: Fix rdtgroup_mkdir()'s unlocked use of kernfs_node::name
x86/resctrl: Rename resctrl_sched_in() to begin with "resctrl_arch_"
x86/resctrl: resctrl_exit() teardown resctrl but leave the mount point
x86/resctrl: Drop __init/__exit on assorted symbols
x86/resctrl: Move is_mba_sc() out of core.c
x86/resctrl: Add end-marker to the resctrl_event_id enum
x86/resctrl: Expand the width of dom_id by replacing mon_data_bits
x86/resctrl: Remove a newline to avoid confusing the code move script
x86/resctrl: Split trace.h
fs/resctrl: Add boiler plate for external resctrl code
x86/resctrl: Move the filesystem bits to headers visible to fs/resctrl
x86/resctrl: Always initialise rid field in rdt_resources_all[]
x86,fs/resctrl: Move the resctrl filesystem code to live in
/fs/resctrl
x86,fs/resctrl: Remove duplicated trace header files
fs/resctrl: Remove unnecessary includes
fs/resctrl: Change internal.h's header guard macros
x86,fs/resctrl: Move resctrl.rst to live under
Documentation/filesystems

Documentation/arch/x86/index.rst | 1 -
Documentation/filesystems/index.rst | 1 +
.../{arch/x86 => filesystems}/resctrl.rst | 0
MAINTAINERS | 3 +-
arch/Kconfig | 8 +
arch/x86/Kconfig | 11 +-
arch/x86/include/asm/resctrl.h | 7 +-
arch/x86/kernel/cpu/resctrl/Makefile | 3 +
arch/x86/kernel/cpu/resctrl/core.c | 31 +-
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 635 ---
arch/x86/kernel/cpu/resctrl/internal.h | 397 +-
arch/x86/kernel/cpu/resctrl/monitor.c | 909 +---
arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 1092 +---
.../resctrl/{trace.h => pseudo_lock_trace.h} | 26 +-
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 4426 +----------------
arch/x86/kernel/process_32.c | 2 +-
arch/x86/kernel/process_64.c | 2 +-
fs/Kconfig | 1 +
fs/Makefile | 1 +
fs/resctrl/Kconfig | 39 +
fs/resctrl/Makefile | 6 +
fs/resctrl/ctrlmondata.c | 660 +++
fs/resctrl/internal.h | 440 ++
fs/resctrl/monitor.c | 929 ++++
fs/resctrl/monitor_trace.h | 33 +
fs/resctrl/pseudo_lock.c | 1105 ++++
fs/resctrl/rdtgroup.c | 4311 ++++++++++++++++
include/linux/resctrl.h | 10 +-
include/linux/resctrl_types.h | 5 +
29 files changed, 7731 insertions(+), 7363 deletions(-)
rename Documentation/{arch/x86 => filesystems}/resctrl.rst (100%)
rename arch/x86/kernel/cpu/resctrl/{trace.h => pseudo_lock_trace.h} (56%)
create mode 100644 fs/resctrl/Kconfig
create mode 100644 fs/resctrl/Makefile
create mode 100644 fs/resctrl/ctrlmondata.c
create mode 100644 fs/resctrl/internal.h
create mode 100644 fs/resctrl/monitor.c
create mode 100644 fs/resctrl/monitor_trace.h
create mode 100644 fs/resctrl/pseudo_lock.c
create mode 100644 fs/resctrl/rdtgroup.c

--
2.20.1