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| author |  Thomas Gleixner <tglx@linutronix.de>
| 2023-05-12 23:07:46 +0200 |
|---|---|---|
| committer |  Peter Zijlstra <peterz@infradead.org>
| 2023-05-15 13:45:01 +0200 |
| commit | 8b5a0f957cc5ca1f68486163d4da4683be3b47aa (patch) | |
| tree | 36d328208d183a30dc52126496e2bd16a498f336 /arch/x86/Kconfig | |
| parent | cpu/hotplug: Provide a split up CPUHP_BRINGUP mechanism (diff) | |
| download | linux-8b5a0f957cc5ca1f68486163d4da4683be3b47aa.tar.gz linux-8b5a0f957cc5ca1f68486163d4da4683be3b47aa.tar.bz2 linux-8b5a0f957cc5ca1f68486163d4da4683be3b47aa.zip | |
x86/smpboot: Enable split CPU startup
The x86 CPU bringup state currently does AP wake-up, wait for AP to
respond and then release it for full bringup.
It is safe to be split into a wake-up and and a separate wait+release
state.
Provide the required functions and enable the split CPU bringup, which
prepares for parallel bringup, where the bringup of the non-boot CPUs takes
two iterations: One to prepare and wake all APs and the second to wait and
release them. Depending on timing this can eliminate the wait time
completely.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Tested-by: Helge Deller <deller@gmx.de> # parisc
Tested-by: Guilherme G. Piccoli <gpiccoli@igalia.com> # Steam Deck
Link: https://lore.kernel.org/r/20230512205257.133453992@linutronix.de
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index adb1ec8503d0..c140a73b4295 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -274,8 +274,8 @@ config X86 select HAVE_UNSTABLE_SCHED_CLOCK select HAVE_USER_RETURN_NOTIFIER select HAVE_GENERIC_VDSO - select HOTPLUG_CORE_SYNC_FULL if SMP select HOTPLUG_SMT if SMP + select HOTPLUG_SPLIT_STARTUP if SMP select IRQ_FORCED_THREADING select NEED_PER_CPU_EMBED_FIRST_CHUNK select NEED_PER_CPU_PAGE_FIRST_CHUNK |