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Kernel: Don't create Function objects in the scheduling code
Each Function is a heap allocation, so let's make an effort to avoid doing that during scheduling. Because of header dependencies, I had to put the runnables iteration helpers in Thread.h, which is a bit meh but at least this cuts out all the kmalloc() traffic in pick_next().
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3 changed files with 49 additions and 59 deletions
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@ -384,3 +384,47 @@ inline const LogStream& operator<<(const LogStream& stream, const Thread& value)
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{
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return stream << "Thread{" << &value << "}(" << value.pid() << ":" << value.tid() << ")";
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}
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struct SchedulerData {
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typedef IntrusiveList<Thread, &Thread::m_runnable_list_node> ThreadList;
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ThreadList m_runnable_threads;
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ThreadList m_nonrunnable_threads;
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ThreadList& thread_list_for_state(Thread::State state)
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{
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if (Thread::is_runnable_state(state))
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return m_runnable_threads;
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return m_nonrunnable_threads;
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}
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};
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template<typename Callback>
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inline IterationDecision Scheduler::for_each_runnable(Callback callback)
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{
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ASSERT_INTERRUPTS_DISABLED();
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auto& tl = g_scheduler_data->m_runnable_threads;
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for (auto it = tl.begin(); it != tl.end();) {
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auto thread = *it;
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it = ++it;
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if (callback(*thread) == IterationDecision::Break)
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return IterationDecision::Break;
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}
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return IterationDecision::Continue;
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}
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template<typename Callback>
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inline IterationDecision Scheduler::for_each_nonrunnable(Callback callback)
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{
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ASSERT_INTERRUPTS_DISABLED();
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auto& tl = g_scheduler_data->m_nonrunnable_threads;
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for (auto it = tl.begin(); it != tl.end();) {
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auto thread = *it;
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it = ++it;
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if (callback(*thread) == IterationDecision::Break)
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return IterationDecision::Break;
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}
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return IterationDecision::Continue;
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}
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