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Kernel: optimize yielding

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Doing a yield no longer raises a software interrupt. Instead it just
saves all the callee saved registers, ip, sp and return value. Because
yield is only called in the kernel, it can just restore registers and
jump to the target address. There is never a need to use iret :)
This commit is contained in:
Bananymous
2026-01-11 01:31:09 +02:00
parent 83e5cb81e8
commit 35c97e2ff8
13 changed files with 109 additions and 118 deletions
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kernel/kernel/Scheduler.cpp
+9 -7
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@@ -207,7 +207,7 @@ namespace Kernel
m_most_loaded_threads.back().queue = nullptr;
}
void Scheduler::reschedule(InterruptStack* interrupt_stack, InterruptRegisters* interrupt_registers)
void Scheduler::reschedule(YieldRegisters* yield_registers)
{
ASSERT(Processor::get_interrupt_state() == InterruptState::Disabled);
@@ -232,8 +232,7 @@ namespace Kernel
case Thread::State::Executing:
{
const uint64_t current_ns = SystemTimer::get().ns_since_boot();
m_current->thread->interrupt_stack() = *interrupt_stack;
m_current->thread->interrupt_registers() = *interrupt_registers;
m_current->thread->yield_registers() = *yield_registers;
m_current->time_used_ns += current_ns - m_current->last_start_ns;
add_current_to_most_loaded(m_current->blocked ? &m_block_queue : &m_run_queue);
if (!m_current->blocked)
@@ -267,8 +266,7 @@ namespace Kernel
{
if (&PageTable::current() != &PageTable::kernel())
PageTable::kernel().load();
*interrupt_stack = m_idle_thread->interrupt_stack();
*interrupt_registers = m_idle_thread->interrupt_registers();
*yield_registers = m_idle_thread->yield_registers();
m_idle_thread->m_state = Thread::State::Executing;
m_idle_start_ns = SystemTimer::get().ns_since_boot();
return;
@@ -296,8 +294,7 @@ namespace Kernel
Processor::load_segments();
}
*interrupt_stack = thread->interrupt_stack();
*interrupt_registers = thread->interrupt_registers();
*yield_registers = thread->yield_registers();
m_current->last_start_ns = SystemTimer::get().ns_since_boot();
}
@@ -333,6 +330,11 @@ namespace Kernel
Processor::yield();
}
extern "C" void scheduler_on_yield(YieldRegisters* yield_registers)
{
Processor::scheduler().reschedule(yield_registers);
}
void Scheduler::timer_interrupt()
{
ASSERT(Processor::get_interrupt_state() == InterruptState::Disabled);