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author | Linus Torvalds <torvalds@linux-foundation.org> | 2023-08-29 01:04:43 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-08-29 01:04:43 +0300 |
commit | 6f49693a6c85e7156d8fde589d9795a01c33c51a (patch) | |
tree | ea2b34cc813a6b8bd4e0093c1a73dc92012118dc /Documentation/ABI/testing/sysfs-devices-system-cpu | |
parent | dd3f0fe5010c2d85801a9c005b9c673908adf36f (diff) | |
parent | e0a99a839f04c90bf9f16919997c4b34f9c8f1f0 (diff) | |
download | linux-6f49693a6c85e7156d8fde589d9795a01c33c51a.tar.xz |
Merge tag 'smp-core-2023-08-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull CPU hotplug updates from Thomas Gleixner:
"Updates for the CPU hotplug core:
- Support partial SMT enablement.
So far the sysfs SMT control only allows to toggle between SMT on
and off. That's sufficient for x86 which usually has at max two
threads except for the Xeon PHI platform which has four threads per
core
Though PowerPC has up to 16 threads per core and so far it's only
possible to control the number of enabled threads per core via a
command line option. There is some way to control this at runtime,
but that lacks enforcement and the usability is awkward
This update expands the sysfs interface and the core infrastructure
to accept numerical values so PowerPC can build SMT runtime control
for partial SMT enablement on top
The core support has also been provided to the PowerPC maintainers
who added the PowerPC related changes on top
- Minor cleanups and documentation updates"
* tag 'smp-core-2023-08-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
Documentation: core-api/cpuhotplug: Fix state names
cpu/hotplug: Remove unused function declaration cpu_set_state_online()
cpu/SMT: Fix cpu_smt_possible() comment
cpu/SMT: Allow enabling partial SMT states via sysfs
cpu/SMT: Create topology_smt_thread_allowed()
cpu/SMT: Remove topology_smt_supported()
cpu/SMT: Store the current/max number of threads
cpu/SMT: Move smt/control simple exit cases earlier
cpu/SMT: Move SMT prototypes into cpu_smt.h
cpu/hotplug: Remove dependancy against cpu_primary_thread_mask
Diffstat (limited to 'Documentation/ABI/testing/sysfs-devices-system-cpu')
-rw-r--r-- | Documentation/ABI/testing/sysfs-devices-system-cpu | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index 77942eedf4f6..183a07c4f191 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -556,6 +556,7 @@ Description: Control Symmetric Multi Threading (SMT) ================ ========================================= "on" SMT is enabled "off" SMT is disabled + "<N>" SMT is enabled with N threads per core. "forceoff" SMT is force disabled. Cannot be changed. "notsupported" SMT is not supported by the CPU "notimplemented" SMT runtime toggling is not |