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Kernel: Don't lock scheduler while updating thread scheduling times

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We can use simple atomic variables with relaxed ordering for this,
and avoid locking altogether.
This commit is contained in:
Andreas Kling 2022-08-19 13:54:14 +02:00
parent 5ada38f9c3
commit 806ade1367
2 changed files with 5 additions and 6 deletions
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3
Kernel/Thread.cpp
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@ -667,8 +667,7 @@ void Thread::update_time_scheduled(u64 current_scheduler_time, bool is_kernel, b
Scheduler::add_time_scheduled(delta, is_kernel); Scheduler::add_time_scheduled(delta, is_kernel);
auto& total_time = is_kernel ? m_total_time_scheduled_kernel : m_total_time_scheduled_user; auto& total_time = is_kernel ? m_total_time_scheduled_kernel : m_total_time_scheduled_user;
SpinlockLocker scheduler_lock(g_scheduler_lock); total_time.fetch_add(delta, AK::memory_order_relaxed);
total_time += delta;
} }
} }
if (no_longer_running) if (no_longer_running)

8
Kernel/Thread.h
View file

@ -1062,8 +1062,8 @@ public:
static constexpr u32 default_kernel_stack_size = 65536; static constexpr u32 default_kernel_stack_size = 65536;
static constexpr u32 default_userspace_stack_size = 1 * MiB; static constexpr u32 default_userspace_stack_size = 1 * MiB;
u64 time_in_user() const { return m_total_time_scheduled_user; } u64 time_in_user() const { return m_total_time_scheduled_user.load(AK::MemoryOrder::memory_order_relaxed); }
u64 time_in_kernel() const { return m_total_time_scheduled_kernel; } u64 time_in_kernel() const { return m_total_time_scheduled_kernel.load(AK::MemoryOrder::memory_order_relaxed); }
enum class PreviousMode : u8 { enum class PreviousMode : u8 {
KernelMode = 0, KernelMode = 0,
@ -1238,8 +1238,8 @@ private:
Atomic<u32> m_cpu { 0 }; Atomic<u32> m_cpu { 0 };
u32 m_cpu_affinity { THREAD_AFFINITY_DEFAULT }; u32 m_cpu_affinity { THREAD_AFFINITY_DEFAULT };
Optional<u64> m_last_time_scheduled; Optional<u64> m_last_time_scheduled;
u64 m_total_time_scheduled_user { 0 }; Atomic<u64> m_total_time_scheduled_user { 0 };
u64 m_total_time_scheduled_kernel { 0 }; Atomic<u64> m_total_time_scheduled_kernel { 0 };
u32 m_ticks_left { 0 }; u32 m_ticks_left { 0 };
u32 m_times_scheduled { 0 }; u32 m_times_scheduled { 0 };
u32 m_ticks_in_user { 0 }; u32 m_ticks_in_user { 0 };