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[kernel] Keep other threads out of idle priority

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Split out different constants for scheduler::idle_priority and
scheduler::max_priority, so that threads never fall to the same priority
level as the idle threads.
This commit is contained in:
Justin C. Miller
2023-02-18 14:17:57 -08:00
parent e250aaef30
commit 8817766469
5 changed files with 10 additions and 9 deletions
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5
src/kernel/scheduler.cpp
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@@ -226,8 +226,8 @@ scheduler::steal_work(cpu_data &cpu)
size_t stolen = 0;
// Don't steal from max_priority, that's the idle thread
for (unsigned pri = 0; pri < max_priority; ++pri)
// Steal from most urgent queues first, don't steal idle threads
for (unsigned pri = 0; pri < idle_priority; ++pri)
stolen += balance_lists(my_queue.ready[pri], other_queue.ready[pri], cpu);
stolen += balance_lists(my_queue.blocked, other_queue.blocked, cpu);
@@ -334,6 +334,7 @@ void
scheduler::maybe_schedule(TCB *t)
{
cpu_data *cpu = t->cpu;
kassert(cpu, "thread with a null cpu");
run_queue &queue = m_run_queues[cpu->index];
uint8_t current_pri = queue.current->priority;