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[kernel] Don't keep creating new processes for kernel tasks

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The scheduler was making new process objects every time it made kernel
task threads. Don't do that.
This commit is contained in:
Justin C. Miller
2020-08-02 18:13:09 -07:00
parent e1b1b5d357
commit b98334db28
1 changed files with 9 additions and 9 deletions
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18
src/kernel/scheduler.cpp
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@@ -47,6 +47,7 @@ scheduler::scheduler(lapic *apic) :
reinterpret_cast<uintptr_t>(&idle_stack_end)); reinterpret_cast<uintptr_t>(&idle_stack_end));
log::debug(logs::task, "Idle thread koid %llx", idle->koid()); log::debug(logs::task, "Idle thread koid %llx", idle->koid());
log::debug(logs::task, "Kernel PML4 %llx", pml4);
auto *tcb = idle->tcb(); auto *tcb = idle->tcb();
m_runlists[max_priority].push_back(tcb); m_runlists[max_priority].push_back(tcb);
@@ -181,20 +182,16 @@ void
scheduler::create_kernel_task(void (*task)(), uint8_t priority, bool constant) scheduler::create_kernel_task(void (*task)(), uint8_t priority, bool constant)
{ {
page_table *pml4 = page_manager::get()->get_kernel_pml4(); page_table *pml4 = page_manager::get()->get_kernel_pml4();
thread *th = create_process(pml4, false); thread *th = m_kernel_process->create_thread(priority, false);
auto *tcb = th->tcb(); auto *tcb = th->tcb();
uint16_t kcs = (1 << 3) | 0; // Kernel CS is GDT entry 1, ring 0
uint16_t kss = (2 << 3) | 0; // Kernel SS is GDT entry 2, ring 0
th->add_thunk_kernel(reinterpret_cast<uintptr_t>(task)); th->add_thunk_kernel(reinterpret_cast<uintptr_t>(task));
tcb->priority = priority; tcb->time_left = quantum(priority);
tcb->pml4 = page_manager::get()->get_kernel_pml4();
if (constant) if (constant)
th->set_state(thread::state::constant); th->set_state(thread::state::constant);
m_runlists[default_priority].push_back(tcb); m_runlists[priority].push_back(tcb);
log::debug(logs::task, "Creating kernel task: thread %llx pri %d", th->koid(), tcb->priority); log::debug(logs::task, "Creating kernel task: thread %llx pri %d", th->koid(), tcb->priority);
log::debug(logs::task, " RSP0 %016lx", tcb->rsp0); log::debug(logs::task, " RSP0 %016lx", tcb->rsp0);
@@ -337,8 +334,11 @@ scheduler::schedule()
bsp_cpu_data.p = &th->parent(); bsp_cpu_data.p = &th->parent();
thread *next_thread = thread::from_tcb(m_current); thread *next_thread = thread::from_tcb(m_current);
log::debug(logs::task, "Scheduler switching threads %llx->%llx, priority %d time left %d @ %lld.", log::debug(logs::task, "Scheduler switching threads %llx->%llx",
th->koid(), next_thread->koid(), m_current->priority, m_current->time_left, m_clock); th->koid(), next_thread->koid());
log::debug(logs::task, " priority %d time left %d @ %lld.",
m_current->priority, m_current->time_left, m_clock);
log::debug(logs::task, " PML4 %llx", m_current->pml4);
task_switch(m_current); task_switch(m_current);
} }