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Kernel: Schedule threads on all processors when SMP is enabled

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Note that SMP is still off by default, but this basically removes the
weird "SMP on but threads don't get scheduled" behavior we had by
default. If you pass "smp=on" to the kernel, you now get SMP. :^)
This commit is contained in:
Andreas Kling 2022-08-18 18:56:50 +02:00
parent b560442fe1
commit c3ad4ffcec
Notes: sideshowbarker 2024-07-17 23:02:37 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/c3ad4ffcec
1 changed files with 1 additions and 14 deletions
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15
Kernel/Scheduler.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -20,9 +20,6 @@
#include <Kernel/Time/TimeManagement.h>
#include <Kernel/kstdio.h>
// Remove this once SMP is stable and can be enabled by default
#define SCHEDULE_ON_ALL_PROCESSORS 0
namespace Kernel {
RecursiveSpinlock g_scheduler_lock;
@ -451,11 +448,6 @@ void Scheduler::timer_tick(RegisterState const& regs)
VERIFY(current_thread->current_trap());
VERIFY(current_thread->current_trap()->regs == &regs);
#if !SCHEDULE_ON_ALL_PROCESSORS
if (!Processor::is_bootstrap_processor())
return; // TODO: This prevents scheduling on other CPUs!
#endif
if (current_thread->process().is_kernel_process()) {
// Because the previous mode when entering/exiting kernel threads never changes
// we never update the time scheduled. So we need to update it manually on the
@ -519,12 +511,7 @@ void Scheduler::idle_loop(void*)
proc.idle_end();
VERIFY_INTERRUPTS_ENABLED();
#if SCHEDULE_ON_ALL_PROCESSORS
yield();
#else
if (Processor::current_id() == 0)
yield();
#endif
}
}