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Everywhere: Make tracking cpu usage independent from system ticks

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This switches tracking CPU usage to more accurately measure time in
user and kernel land using either the TSC or another time source.
This will also come in handy when implementing a tickless kernel mode.
This commit is contained in:
Tom 2021-07-14 21:46:32 -06:00 • committed by Andreas Kling
parent 7e77a2ec40
commit a635ff4e60
13 changed files with 174 additions and 85 deletions
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19
Kernel/Thread.h
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@ -987,6 +987,7 @@ public:
void exit(void* = nullptr);
void update_time_scheduled(u64, bool, bool);
bool tick();
void set_ticks_left(u32 t) { m_ticks_left = t; }
u32 ticks_left() const { return m_ticks_left; }
@ -1112,15 +1113,22 @@ public:
static constexpr u32 default_kernel_stack_size = 65536;
static constexpr u32 default_userspace_stack_size = 1 * MiB;
u32 ticks_in_user() const { return m_ticks_in_user; }
u32 ticks_in_kernel() const { return m_ticks_in_kernel; }
u64 time_in_user() const { return m_total_time_scheduled_user; }
u64 time_in_kernel() const { return m_total_time_scheduled_kernel; }
enum class PreviousMode : u8 {
KernelMode = 0,
UserMode
};
PreviousMode previous_mode() const { return m_previous_mode; }
void set_previous_mode(PreviousMode mode) { m_previous_mode = mode; }
bool set_previous_mode(PreviousMode mode)
{
if (m_previous_mode == mode)
return false;
m_previous_mode = mode;
return true;
}
TrapFrame*& current_trap() { return m_current_trap; }
RecursiveSpinLock& get_lock() const { return m_lock; }
@ -1270,6 +1278,9 @@ private:
IntrusiveListNode<Thread> m_ready_queue_node;
Atomic<u32> m_cpu { 0 };
u32 m_cpu_affinity { THREAD_AFFINITY_DEFAULT };
Optional<u64> m_last_time_scheduled;
u64 m_total_time_scheduled_user { 0 };
u64 m_total_time_scheduled_kernel { 0 };
u32 m_ticks_left { 0 };
u32 m_times_scheduled { 0 };
u32 m_ticks_in_user { 0 };
@ -1302,7 +1313,7 @@ private:
Atomic<bool, AK::MemoryOrder::memory_order_relaxed> m_is_active { false };
bool m_is_joinable { true };
bool m_handling_page_fault { false };
PreviousMode m_previous_mode { PreviousMode::UserMode };
PreviousMode m_previous_mode { PreviousMode::KernelMode }; // We always start out in kernel mode
unsigned m_syscall_count { 0 };
unsigned m_inode_faults { 0 };