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Kernel: Track processor idle state and wake processors when waking threads

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Attempt to wake idle processors to get threads to be scheduled more quickly.
We don't want to wait until the next timer tick if we have processors that
aren't doing anything.
This commit is contained in:
Tom 2020-10-28 16:06:16 -06:00 • committed by Andreas Kling
parent 39f408daa0
commit c531084873
4 changed files with 72 additions and 3 deletions
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12
Kernel/Arch/i386/CPU.h
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@ -709,6 +709,7 @@ class Processor {
u32 m_cpu;
u32 m_in_irq;
Atomic<u32, AK::MemoryOrder::memory_order_relaxed> m_in_critical;
static Atomic<u32> s_idle_cpu_mask;
TSS32 m_tss;
static FPUState s_clean_fpu_state;
@ -763,6 +764,16 @@ public:
void early_initialize(u32 cpu);
void initialize(u32 cpu);
void idle_begin()
{
s_idle_cpu_mask.fetch_or(1u << m_cpu, AK::MemoryOrder::memory_order_relaxed);
}
void idle_end()
{
s_idle_cpu_mask.fetch_and(~(1u << m_cpu), AK::MemoryOrder::memory_order_relaxed);
}
static u32 count()
{
// NOTE: because this value never changes once all APs are booted,
@ -1010,6 +1021,7 @@ public:
static void smp_unicast(u32 cpu, void (*callback)(), bool async);
static void smp_unicast(u32 cpu, void (*callback)(void*), void* data, void (*free_data)(void*), bool async);
static void smp_broadcast_flush_tlb(const PageDirectory*, VirtualAddress, size_t);
static u32 smp_wake_n_idle_processors(u32 wake_count);
template<typename Callback>
static void deferred_call_queue(Callback callback)