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kern: update scheduler for new switch count tracking logic

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This commit is contained in:
Michael Scire 2023-02-21 03:12:17 -07:00
parent 8176f085f1
commit 3a5f406c5f
6 changed files with 39 additions and 18 deletions
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8
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_assembly_offsets.h
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@ -263,7 +263,7 @@
/* NOTE: Due to constraints on ldarb relative offsets, KSCHEDULER_NEEDS_SCHEDULING cannot trivially be changed, and will require assembly edits. */
#define KSCHEDULER_NEEDS_SCHEDULING 0x00
#define KSCHEDULER_INTERRUPT_TASK_RUNNABLE 0x01
#define KSCHEDULER_HIGHEST_PRIORITY_THREAD 0x10
#define KSCHEDULER_IDLE_THREAD_STACK 0x18
#define KSCHEDULER_PREVIOUS_THREAD 0x20
#define KSCHEDULER_INTERRUPT_TASK_MANAGER 0x28
#define KSCHEDULER_HIGHEST_PRIORITY_THREAD 0x18
#define KSCHEDULER_IDLE_THREAD_STACK 0x20
#define KSCHEDULER_PREVIOUS_THREAD 0x28
#define KSCHEDULER_INTERRUPT_TASK_MANAGER 0x30

5
libraries/libmesosphere/include/mesosphere/kern_k_process.hpp
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@ -108,6 +108,7 @@ namespace ams::kern {
KWaitObject m_wait_object;
KThread *m_running_threads[cpu::NumCores];
u64 m_running_thread_idle_counts[cpu::NumCores];
u64 m_running_thread_switch_counts[cpu::NumCores];
KThread *m_pinned_threads[cpu::NumCores];
util::Atomic<s64> m_cpu_time;
util::Atomic<s64> m_num_process_switches;
@ -285,9 +286,10 @@ namespace ams::kern {
return m_system_resource->IsSecureResource() ? static_cast<KSecureSystemResource *>(m_system_resource)->GetUsedSize() : 0;
}
void SetRunningThread(s32 core, KThread *thread, u64 idle_count) {
void SetRunningThread(s32 core, KThread *thread, u64 idle_count, u64 switch_count) {
m_running_threads[core] = thread;
m_running_thread_idle_counts[core] = idle_count;
m_running_thread_switch_counts[core] = switch_count;
}
void ClearRunningThread(KThread *thread) {
@ -306,6 +308,7 @@ namespace ams::kern {
constexpr KThread *GetRunningThread(s32 core) const { return m_running_threads[core]; }
constexpr u64 GetRunningThreadIdleCount(s32 core) const { return m_running_thread_idle_counts[core]; }
constexpr u64 GetRunningThreadSwitchCount(s32 core) const { return m_running_thread_switch_counts[core]; }
void RegisterThread(KThread *thread);
void UnregisterThread(KThread *thread);

6
libraries/libmesosphere/include/mesosphere/kern_k_scheduler.hpp
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@ -43,6 +43,7 @@ namespace ams::kern {
bool interrupt_task_runnable{false};
bool should_count_idle{false};
u64 idle_count{0};
u64 switch_count{0};
KThread *highest_priority_thread{nullptr};
void *idle_thread_stack{nullptr};
KThread *prev_thread{nullptr};
@ -67,6 +68,7 @@ namespace ams::kern {
m_state.interrupt_task_runnable = false;
m_state.should_count_idle = false;
m_state.idle_count = 0;
m_state.switch_count = 0;
m_state.idle_thread_stack = nullptr;
m_state.highest_priority_thread = nullptr;
m_state.prev_thread = nullptr;
@ -93,6 +95,10 @@ namespace ams::kern {
return m_state.idle_count;
}
ALWAYS_INLINE u64 GetSwitchCount() const {
return m_state.switch_count;
}
ALWAYS_INLINE KThread *GetIdleThread() const {
return m_idle_thread;
}

21
libraries/libmesosphere/source/kern_k_debug_base.cpp
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@ -219,12 +219,21 @@ namespace ams::kern {
const s32 core_id = GetCurrentCoreId();
KThread *thread = process->GetRunningThread(core_id);
/* Check that the thread's idle count is correct. */
R_UNLESS(process->GetRunningThreadIdleCount(core_id) == Kernel::GetScheduler(core_id).GetIdleCount(), svc::ResultNoThread());
/* Check that the thread is running on the current core. */
R_UNLESS(thread != nullptr, svc::ResultUnknownThread());
R_UNLESS(thread->GetActiveCore() == core_id, svc::ResultUnknownThread());
/* We want to check that the thread is actually running. */
/* If it is, then the scheduler will have just switched from the thread to the current thread. */
/* This implies exactly one switch will have taken place, and the current thread will be on the current core. */
const auto &scheduler = Kernel::GetScheduler(core_id);
if (!(thread != nullptr && thread->GetActiveCore() == core_id && process->GetRunningThreadSwitchCount(core_id) + 1 == scheduler.GetSwitchCount())) {
/* The most recent thread switch was from a thread other than the expected one to the current one. */
/* We want to use the appropriate result to inform userland about what thread we switched from. */
if (scheduler.GetIdleCount() + 1 == scheduler.GetSwitchCount()) {
/* We switched from the idle thread. */
R_THROW(svc::ResultNoThread());
} else {
/* We switched from some other unknown thread. */
R_THROW(svc::ResultUnknownThread());
}
}
/* Get the thread's exception context. */
GetExceptionContext(thread)->GetSvcThreadContext(out_context);

1
libraries/libmesosphere/source/kern_k_process.cpp
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@ -214,6 +214,7 @@ namespace ams::kern {
m_running_threads[i] = nullptr;
m_pinned_threads[i] = nullptr;
m_running_thread_idle_counts[i] = 0;
m_running_thread_switch_counts[i] = 0;
}
/* Set max memory based on address space type. */

6
libraries/libmesosphere/source/kern_k_scheduler.cpp
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@ -88,10 +88,12 @@ namespace ams::kern {
if (m_state.should_count_idle) {
if (AMS_LIKELY(highest_thread != nullptr)) {
if (KProcess *process = highest_thread->GetOwnerProcess(); process != nullptr) {
process->SetRunningThread(m_core_id, highest_thread, m_state.idle_count);
/* Set running thread (and increment switch count). */
process->SetRunningThread(m_core_id, highest_thread, m_state.idle_count, ++m_state.switch_count);
}
} else {
m_state.idle_count++;
/* Set idle count and switch count to switch count + 1. */
m_state.idle_count = ++m_state.switch_count;
}
}