Core Timing: General corrections and added tests.
This commit is contained in:
Fernando Sahmkow
FernandoS27
parent
c9a1129c95
commit
65aff6930b
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@ -13,6 +13,8 @@
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#include "common/thread.h"
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#include "core/core_timing_util.h"
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#pragma optoimize("", off)
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namespace Core::Timing {
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constexpr int MAX_SLICE_LENGTH = 10000;
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@ -114,7 +116,7 @@ void CoreTiming::UnscheduleEvent(const EventType* event_type, u64 userdata) {
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u64 CoreTiming::GetTicks() const {
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u64 ticks = static_cast<u64>(global_timer);
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if (!is_global_timer_sane) {
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ticks += time_slice[current_context] - downcounts[current_context];
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ticks += accumulated_ticks;
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}
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return ticks;
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}
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@ -124,6 +126,7 @@ u64 CoreTiming::GetIdleTicks() const {
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}
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void CoreTiming::AddTicks(u64 ticks) {
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accumulated_ticks += ticks;
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downcounts[current_context] -= static_cast<s64>(ticks);
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}
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@ -151,7 +154,6 @@ void CoreTiming::ForceExceptionCheck(s64 cycles) {
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// downcount is always (much) smaller than MAX_INT so we can safely cast cycles to an int
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// here. Account for cycles already executed by adjusting the g.slice_length
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slice_length -= downcounts[current_context] - static_cast<int>(cycles);
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downcounts[current_context] = static_cast<int>(cycles);
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}
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@ -172,8 +174,8 @@ std::optional<u64> CoreTiming::NextAvailableCore(const s64 needed_ticks) const {
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void CoreTiming::Advance() {
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std::unique_lock<std::mutex> guard(inner_mutex);
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const int cycles_executed = time_slice[current_context] - downcounts[current_context];
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time_slice[current_context] = std::max<s64>(0, downcounts[current_context]);
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const int cycles_executed = accumulated_ticks;
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time_slice[current_context] = std::max<s64>(0, time_slice[current_context] - accumulated_ticks);
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global_timer += cycles_executed;
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is_global_timer_sane = true;
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@ -198,6 +200,8 @@ void CoreTiming::Advance() {
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}
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}
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accumulated_ticks = 0;
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downcounts[current_context] = time_slice[current_context];
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}
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@ -212,6 +216,9 @@ void CoreTiming::ResetRun() {
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s64 needed_ticks = std::min<s64>(event_queue.front().time - global_timer, MAX_SLICE_LENGTH);
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downcounts[current_context] = needed_ticks;
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}
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is_global_timer_sane = false;
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accumulated_ticks = 0;
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}
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void CoreTiming::Idle() {
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@ -130,6 +130,7 @@ private:
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s64 global_timer = 0;
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s64 idled_cycles = 0;
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s64 slice_length = 0;
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u64 accumulated_ticks = 0;
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std::array<s64, num_cpu_cores> downcounts{};
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// Slice of time assigned to each core per run.
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std::array<s64, num_cpu_cores> time_slice{};
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@ -6,6 +6,7 @@
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#include <array>
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#include <bitset>
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#include <cstdlib>
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#include <string>
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#include "common/file_util.h"
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#include "core/core.h"
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@ -13,7 +14,7 @@
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// Numbers are chosen randomly to make sure the correct one is given.
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static constexpr std::array<u64, 5> CB_IDS{{42, 144, 93, 1026, UINT64_C(0xFFFF7FFFF7FFFF)}};
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static constexpr int MAX_SLICE_LENGTH = 20000; // Copied from CoreTiming internals
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static constexpr int MAX_SLICE_LENGTH = 10000; // Copied from CoreTiming internals
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static std::bitset<CB_IDS.size()> callbacks_ran_flags;
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static u64 expected_callback = 0;
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@ -28,6 +29,12 @@ void CallbackTemplate(u64 userdata, s64 cycles_late) {
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REQUIRE(lateness == cycles_late);
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}
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static u64 callbacks_done = 0;
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void EmptyCallback(u64 userdata, s64 cycles_late) {
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++callbacks_done;
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}
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struct ScopeInit final {
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ScopeInit() {
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core_timing.Initialize();
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@ -39,16 +46,159 @@ struct ScopeInit final {
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Core::Timing::CoreTiming core_timing;
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};
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static void AdvanceAndCheck(Core::Timing::CoreTiming& core_timing, u32 idx, int downcount,
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static void AdvanceAndCheck(Core::Timing::CoreTiming& core_timing, u32 idx, u32 context = 0,
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int expected_lateness = 0, int cpu_downcount = 0) {
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callbacks_ran_flags = 0;
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expected_callback = CB_IDS[idx];
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lateness = expected_lateness;
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// Pretend we executed X cycles of instructions.
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core_timing.SwitchContext(context);
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core_timing.AddTicks(core_timing.GetDowncount() - cpu_downcount);
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core_timing.Advance();
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core_timing.SwitchContext((context + 1) % 4);
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REQUIRE(decltype(callbacks_ran_flags)().set(idx) == callbacks_ran_flags);
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REQUIRE(downcount == core_timing.GetDowncount());
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}
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TEST_CASE("CoreTiming[BasicOrder]", "[core]") {
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ScopeInit guard;
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auto& core_timing = guard.core_timing;
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Core::Timing::EventType* cb_a = core_timing.RegisterEvent("callbackA", CallbackTemplate<0>);
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Core::Timing::EventType* cb_b = core_timing.RegisterEvent("callbackB", CallbackTemplate<1>);
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Core::Timing::EventType* cb_c = core_timing.RegisterEvent("callbackC", CallbackTemplate<2>);
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Core::Timing::EventType* cb_d = core_timing.RegisterEvent("callbackD", CallbackTemplate<3>);
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Core::Timing::EventType* cb_e = core_timing.RegisterEvent("callbackE", CallbackTemplate<4>);
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// Enter slice 0
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core_timing.ResetRun();
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// D -> B -> C -> A -> E
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core_timing.SwitchContext(0);
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core_timing.ScheduleEvent(1000, cb_a, CB_IDS[0]);
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REQUIRE(1000 == core_timing.GetDowncount());
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core_timing.ScheduleEvent(500, cb_b, CB_IDS[1]);
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REQUIRE(500 == core_timing.GetDowncount());
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core_timing.ScheduleEvent(800, cb_c, CB_IDS[2]);
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REQUIRE(500 == core_timing.GetDowncount());
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core_timing.ScheduleEvent(100, cb_d, CB_IDS[3]);
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REQUIRE(100 == core_timing.GetDowncount());
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core_timing.ScheduleEvent(1200, cb_e, CB_IDS[4]);
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REQUIRE(100 == core_timing.GetDowncount());
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AdvanceAndCheck(core_timing, 3, 0);
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AdvanceAndCheck(core_timing, 1, 1);
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AdvanceAndCheck(core_timing, 2, 2);
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AdvanceAndCheck(core_timing, 0, 3);
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AdvanceAndCheck(core_timing, 4, 0);
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}
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TEST_CASE("CoreTiming[FairSharing]", "[core]") {
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ScopeInit guard;
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auto& core_timing = guard.core_timing;
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Core::Timing::EventType* empty_callback =
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core_timing.RegisterEvent("empty_callback", EmptyCallback);
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callbacks_done = 0;
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u64 MAX_CALLBACKS = 10;
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for (std::size_t i = 0; i < 10; i++) {
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core_timing.ScheduleEvent(i * 3333U, empty_callback, 0);
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}
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const s64 advances = MAX_SLICE_LENGTH / 10;
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core_timing.ResetRun();
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u64 current_time = core_timing.GetTicks();
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bool keep_running{};
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do {
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keep_running = false;
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for (u32 active_core = 0; active_core < 4; ++active_core) {
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core_timing.SwitchContext(active_core);
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if (core_timing.CurrentContextCanRun()) {
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core_timing.AddTicks(std::min<s64>(advances, core_timing.GetDowncount()));
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core_timing.Advance();
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}
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keep_running |= core_timing.CurrentContextCanRun();
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}
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} while (keep_running);
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u64 current_time_2 = core_timing.GetTicks();
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REQUIRE(MAX_CALLBACKS == callbacks_done);
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REQUIRE(current_time_2 == current_time + MAX_SLICE_LENGTH * 4);
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}
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TEST_CASE("Core::Timing[PredictableLateness]", "[core]") {
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ScopeInit guard;
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auto& core_timing = guard.core_timing;
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Core::Timing::EventType* cb_a = core_timing.RegisterEvent("callbackA", CallbackTemplate<0>);
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Core::Timing::EventType* cb_b = core_timing.RegisterEvent("callbackB", CallbackTemplate<1>);
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// Enter slice 0
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core_timing.ResetRun();
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core_timing.ScheduleEvent(100, cb_a, CB_IDS[0]);
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core_timing.ScheduleEvent(200, cb_b, CB_IDS[1]);
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AdvanceAndCheck(core_timing, 0, 0, 10, -10); // (100 - 10)
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AdvanceAndCheck(core_timing, 1, 1, 50, -50);
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}
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namespace ChainSchedulingTest {
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static int reschedules = 0;
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static void RescheduleCallback(Core::Timing::CoreTiming& core_timing, u64 userdata,
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s64 cycles_late) {
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--reschedules;
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REQUIRE(reschedules >= 0);
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REQUIRE(lateness == cycles_late);
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if (reschedules > 0) {
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core_timing.ScheduleEvent(1000, reinterpret_cast<Core::Timing::EventType*>(userdata),
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userdata);
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}
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}
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} // namespace ChainSchedulingTest
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TEST_CASE("CoreTiming[ChainScheduling]", "[core]") {
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using namespace ChainSchedulingTest;
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ScopeInit guard;
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auto& core_timing = guard.core_timing;
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Core::Timing::EventType* cb_a = core_timing.RegisterEvent("callbackA", CallbackTemplate<0>);
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Core::Timing::EventType* cb_b = core_timing.RegisterEvent("callbackB", CallbackTemplate<1>);
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Core::Timing::EventType* cb_c = core_timing.RegisterEvent("callbackC", CallbackTemplate<2>);
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Core::Timing::EventType* cb_rs = core_timing.RegisterEvent(
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"callbackReschedule", [&core_timing](u64 userdata, s64 cycles_late) {
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RescheduleCallback(core_timing, userdata, cycles_late);
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});
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// Enter slice 0
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core_timing.ResetRun();
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core_timing.ScheduleEvent(800, cb_a, CB_IDS[0]);
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core_timing.ScheduleEvent(1000, cb_b, CB_IDS[1]);
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core_timing.ScheduleEvent(2200, cb_c, CB_IDS[2]);
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core_timing.ScheduleEvent(1000, cb_rs, reinterpret_cast<u64>(cb_rs));
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REQUIRE(800 == core_timing.GetDowncount());
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reschedules = 3;
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AdvanceAndCheck(core_timing, 0, 0); // cb_a
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AdvanceAndCheck(core_timing, 1, 1); // cb_b, cb_rs
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REQUIRE(2 == reschedules);
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core_timing.AddTicks(core_timing.GetDowncount());
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core_timing.Advance(); // cb_rs
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core_timing.SwitchContext(3);
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REQUIRE(1 == reschedules);
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REQUIRE(200 == core_timing.GetDowncount());
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AdvanceAndCheck(core_timing, 2, 3); // cb_c
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core_timing.AddTicks(core_timing.GetDowncount());
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core_timing.Advance(); // cb_rs
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REQUIRE(0 == reschedules);
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}
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