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| author | Jinjie Ruan <ruanjinjie@huawei.com> | 2026-04-17 11:25:40 +0800 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2026-05-15 08:26:31 -0600 |
| commit | f5899ff9c48d8f4dcfb1d622605d6ea2e0cf7eb9 (patch) | |
| tree | 93bf1fd14e1a9bfbd965569a1a99911241440cff /Documentation/admin-guide | |
| parent | 696ce7ca20f5269ccef828663c4272b72be88ac3 (diff) | |
| download | lwn-f5899ff9c48d8f4dcfb1d622605d6ea2e0cf7eb9.tar.gz lwn-f5899ff9c48d8f4dcfb1d622605d6ea2e0cf7eb9.zip | |
docs: Update nosmt support for arm64
commit eed4583bcf9a6 ("arm64: Kconfig: Enable HOTPLUG_SMT") enable
HOTPLUG_SMT for SMT control for arm64, but the documentation was
not updated accordingly to reflect that ARM64 now supports control SMT
via boot parameter and sysfs knobs:
1. Boot parameters:
nosmt: Disable SMT, can be enabled via sysfs knobs.
nosmt=force: Disable SMT, cannot be enabled via sysfs knobs.
2. Runtime sysfs controls:
Write "on", "off", "forceoff" or the number of SMT threads (1, 2, ...)
to /sys/devices/system/cpu/smt/control.
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260417032540.3720627-1-ruanjinjie@huawei.com>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index b1e2e50d5c8d..8c22943e51c0 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4638,7 +4638,7 @@ Kernel parameters nosmt [KNL,MIPS,PPC,EARLY] Disable symmetric multithreading (SMT). Equivalent to smt=1. - [KNL,LOONGARCH,X86,PPC,S390] Disable symmetric multithreading (SMT). + [KNL,LOONGARCH,X86,ARM64,PPC,S390] Disable symmetric multithreading (SMT). nosmt=force: Force disable SMT, cannot be undone via the sysfs control file. |