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Kernel: Add a compile-time switch to enable scheduling on all CPUs

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This is meant to be temporary only and should be removed once scheduling
on all CPUs is stable.
This commit is contained in:
Tom 2021-01-26 22:45:30 -07:00 committed by Andreas Kling
parent e9e76b8074
commit db1448b21a
Notes: sideshowbarker 2024-07-18 22:48:22 +09:00 
Author: https://github.com/tomuta
Commit: https://github.com/SerenityOS/serenity/commit/db1448b21a2
Pull-request: https://github.com/SerenityOS/serenity/pull/5073
1 changed files with 9 additions and 0 deletions
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9
Kernel/Scheduler.cpp
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@ -36,6 +36,9 @@
#include <Kernel/Time/TimeManagement.h>
#include <Kernel/TimerQueue.h>
// Remove this once SMP is stable and can be enabled by default
#define SCHEDULE_ON_ALL_PROCESSORS 0
namespace Kernel {
class SchedulerPerProcessorData {
@ -550,9 +553,11 @@ void Scheduler::timer_tick(const RegisterState& regs)
ASSERT(current_thread->current_trap());
ASSERT(current_thread->current_trap()->regs == &regs);
#if !SCHEDULE_ON_ALL_PROCESSORS
bool is_bsp = Processor::id() == 0;
if (!is_bsp)
return; // TODO: This prevents scheduling on other CPUs!
#endif
if (current_thread->process().is_profiling()) {
ASSERT(current_thread->process().perf_events());
auto& perf_events = *current_thread->process().perf_events();
@ -616,8 +621,12 @@ void Scheduler::idle_loop(void*)
proc.idle_end();
ASSERT_INTERRUPTS_ENABLED();
#if SCHEDULE_ON_ALL_PROCESSORS
yield();
#else
if (Processor::current().id() == 0)
yield();
#endif
}
}