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Kernel: Rework Process::Priority into ThreadPriority

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Scheduling priority is now set at the thread level instead of at the
process level.

This is a step towards allowing processes to set different priorities
for threads. There's no userspace API for that yet, since only the main
thread's priority is affected by sched_setparam().
This commit is contained in:
Andreas Kling 2019-11-06 16:26:51 +01:00
parent e33bbdb6ba
commit 083c5f8b89
7 changed files with 46 additions and 46 deletions
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16
Kernel/Scheduler.cpp
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@ -27,17 +27,17 @@ void Scheduler::update_state_for_thread(Thread& thread)
//#define SCHEDULER_DEBUG
//#define SCHEDULER_RUNNABLE_DEBUG
static u32 time_slice_for(Process::Priority priority)
static u32 time_slice_for(ThreadPriority priority)
{
// One time slice unit == 1ms
switch (priority) {
case Process::HighPriority:
case ThreadPriority::High:
return 50;
case Process::NormalPriority:
case ThreadPriority::Normal:
return 15;
case Process::LowPriority:
case ThreadPriority::Low:
return 5;
case Process::IdlePriority:
case ThreadPriority::Idle:
return 1;
}
ASSERT_NOT_REACHED();
@ -387,7 +387,7 @@ bool Scheduler::donate_to(Thread* beneficiary, const char* reason)
if (!beneficiary || beneficiary->state() != Thread::Runnable || ticks_left <= 1)
return yield();
unsigned ticks_to_donate = min(ticks_left - 1, time_slice_for(beneficiary->process().priority()));
unsigned ticks_to_donate = min(ticks_left - 1, time_slice_for(beneficiary->priority()));
#ifdef SCHEDULER_DEBUG
dbgprintf("%s(%u:%u) donating %u ticks to %s(%u:%u), reason=%s\n", current->process().name().characters(), current->pid(), current->tid(), ticks_to_donate, beneficiary->process().name().characters(), beneficiary->pid(), beneficiary->tid(), reason);
#endif
@ -429,7 +429,7 @@ void Scheduler::switch_now()
bool Scheduler::context_switch(Thread& thread)
{
thread.set_ticks_left(time_slice_for(thread.process().priority()));
thread.set_ticks_left(time_slice_for(thread.priority()));
thread.did_schedule();
if (current == &thread)
@ -521,7 +521,7 @@ void Scheduler::initialize()
initialize_redirection();
s_colonel_process = Process::create_kernel_process("colonel", nullptr);
// Make sure the colonel uses a smallish time slice.
s_colonel_process->set_priority(Process::IdlePriority);
s_colonel_process->main_thread().set_priority(ThreadPriority::Idle);
load_task_register(s_redirection.selector);
}