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perf: sync only GPU-dirty readbacks

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This commit is contained in:
nmzik
2026-08-03 22:13:41 +02:00
parent e8752aca7e
commit 51d0e02543
13 changed files with 373 additions and 390 deletions
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src/graphics/host_gpu/renderer/cache/bufferCache.cpp
Vendored
+37 -5
View File
@@ -3,15 +3,18 @@
#include "common/assert.h"
#include "common/logging/log.h"
#include "common/profiler.h"
#include "graphics/guest_gpu/graphicsRun.h"
#include "graphics/host_gpu/graphicContext.h"
#include "graphics/host_gpu/renderer/cache/resourceMutex.h"
#include "graphics/host_gpu/renderer/cache/textureCache.h"
#include "graphics/host_gpu/renderer/commandScheduler.h"
#include "graphics/host_gpu/renderer/render.h"
#include "graphics/host_gpu/renderer/renderContext.h"
#include "kernel/memory.h"
#include <algorithm>
#include <array>
#include <cinttypes>
#include <cstring>
#include <utility>
#include <vector>
@@ -288,10 +291,29 @@ void BufferCache::InvalidateMemory(uint64_t vaddr, uint64_t size) {
return;
}
m_memory_tracker.InvalidateRegion(vaddr, size,
[this, vaddr, size] { ReadMemory(vaddr, size); });
[this, vaddr, size] { ReadMemory(vaddr, size, true); });
}
void BufferCache::ReadMemory(uint64_t vaddr, uint64_t size) {
void BufferCache::ReadMemory(uint64_t vaddr, uint64_t size, bool is_write) {
if (Gpu::IsGpuThread()) {
ReadMemoryOnGpu(vaddr, size, is_write);
return;
}
if (CommandScheduler::InDeferredOperation()) {
EXIT("unsupported buffer readback from an asynchronous GPU completion, "
"addr=0x%016" PRIx64 " size=0x%016" PRIx64 "\n",
vaddr, size);
}
if (m_resource_mutex.IsOwnedByCurrentThread()) {
EXIT("unsupported buffer readback from a pre-owned resource transaction, "
"addr=0x%016" PRIx64 " size=0x%016" PRIx64 "\n",
vaddr, size);
}
m_scheduler.Context().GetGpu().SendCommandSync(
[this, vaddr, size, is_write] { ReadMemoryOnGpu(vaddr, size, is_write); });
}
void BufferCache::ReadMemoryOnGpu(uint64_t vaddr, uint64_t size, bool is_write) {
std::vector<DownloadCopy> copies;
{
FaultSafeCacheLock lock(this, m_mutex);
@@ -322,9 +344,16 @@ void BufferCache::ReadMemory(uint64_t vaddr, uint64_t size) {
}
}
});
}
if (copies.empty()) {
return;
if (copies.empty()) {
if (!is_write) {
return;
}
// A preceding read fault can consume the last GPU-owned copy after this write
// invalidation has already chosen to flush. Complete the CPU ownership handoff even
// though this callback no longer has bytes to download.
m_memory_tracker.MarkRegionAsCpuModified(vaddr, size);
return;
}
}
auto downloads = RecordDownloads(copies);
m_scheduler.FinishCurrent();
@@ -336,6 +365,9 @@ void BufferCache::ReadMemory(uint64_t vaddr, uint64_t size) {
}
// The enumeration above covered whole dirty pages and every exact interval on them.
m_memory_tracker.UnmarkRegionAsGpuModified(vaddr, size);
if (is_write) {
m_memory_tracker.MarkRegionAsCpuModified(vaddr, size);
}
}
}
src/graphics/host_gpu/renderer/cache/bufferCache.h
Vendored
+2 -1
View File
@@ -46,7 +46,7 @@ public:
KYTY_CLASS_NO_COPY(BufferCache);
void InvalidateMemory(uint64_t vaddr, uint64_t size);
void ReadMemory(uint64_t vaddr, uint64_t size);
void ReadMemory(uint64_t vaddr, uint64_t size, bool is_write = false);
void UnmapMemory(uint64_t vaddr, uint64_t size);
[[nodiscard]] BufferBinding ObtainBuffer(CommandBuffer& command, uint64_t vaddr, uint64_t size,
bool is_written = false, bool is_read = true,
@@ -97,6 +97,7 @@ private:
void PublishDownloads(std::span<const DownloadRange> downloads);
void QueueGarbageDownload(std::span<const DownloadCopy> copies, RetiredBuffer retire);
void WriteHostMemory(uint64_t vaddr, std::span<const uint8_t> data);
void ReadMemoryOnGpu(uint64_t vaddr, uint64_t size, bool is_write);
GraphicContext& m_graphics;
CommandScheduler& m_scheduler;
src/graphics/host_gpu/renderer/cache/gpuResourceManager.cpp
Vendored
+8 -57
View File
@@ -1,7 +1,6 @@
#include "graphics/host_gpu/renderer/cache/gpuResourceManager.h"
#include "common/assert.h"
#include "graphics/guest_gpu/command_processor/commandProcessor.h"
#include "graphics/guest_gpu/graphicsRun.h"
#include "graphics/host_gpu/renderer/commandScheduler.h"
namespace Libs::Graphics {
@@ -18,69 +17,21 @@ bool GpuResourceManager::HandleFault(PageFaultAccess access, uint64_t fault_vadd
if (!IsMapped(fault_vaddr, fault_size)) {
return false;
}
if (CommandScheduler::InDeferredOperation()) {
EXIT("unsupported guest-memory fault from an asynchronous GPU completion, "
"addr=0x%016" PRIx64 " access=%u\n",
fault_vaddr, static_cast<uint32_t>(access));
if (access == PageFaultAccess::Write) {
m_buffer_cache.InvalidateMemory(fault_vaddr, fault_size);
m_texture_cache.InvalidateMemory(fault_vaddr, fault_size);
} else {
m_buffer_cache.ReadMemory(fault_vaddr, fault_size);
}
bool handled = false;
const auto resolve = [this, access, fault_vaddr, &handled](CommandProcessor& cp) {
cp.BeginReadbackTransaction();
{
ResourceMutex::FaultScope fault(m_resource_mutex);
if (access == PageFaultAccess::Write) {
m_buffer_cache.InvalidateMemory(fault_vaddr, fault_size);
m_texture_cache.InvalidateMemory(fault_vaddr, fault_size);
} else {
m_buffer_cache.ReadMemory(fault_vaddr, fault_size);
}
handled = true;
}
cp.EndReadbackTransaction();
};
if (auto* cp = Gpu::CurrentCommandProcessor(); cp != nullptr) {
resolve(*cp);
return handled;
}
if (m_resource_mutex.IsOwnedByCurrentThread()) {
EXIT("unsupported page fault from a pre-owned resource transaction, addr=0x%016" PRIx64
" access=%u\n",
fault_vaddr, static_cast<uint32_t>(access));
}
EXIT_IF(m_gpu == nullptr);
m_gpu->SendCommandSyncWithProcessor(resolve);
return handled;
return true;
}
bool GpuResourceManager::InvalidateMemory(uint64_t vaddr, uint64_t size) {
if (!IsMapped(vaddr, size)) {
return false;
}
if (CommandScheduler::InDeferredOperation()) {
EXIT("unsupported memory invalidation from an asynchronous GPU completion, "
"addr=0x%016" PRIx64 " size=0x%016" PRIx64 "\n",
vaddr, size);
}
const auto resolve = [this, vaddr, size](CommandProcessor& cp) {
cp.BeginReadbackTransaction();
{
ResourceMutex::FaultScope fault(m_resource_mutex);
m_buffer_cache.InvalidateMemory(vaddr, size);
m_texture_cache.InvalidateMemory(vaddr, size);
}
cp.EndReadbackTransaction();
};
if (auto* cp = Gpu::CurrentCommandProcessor(); cp != nullptr) {
resolve(*cp);
return true;
}
if (m_resource_mutex.IsOwnedByCurrentThread()) {
EXIT("unsupported memory invalidation from a pre-owned resource transaction, "
"addr=0x%016" PRIx64 " size=0x%016" PRIx64 "\n",
vaddr, size);
}
EXIT_IF(m_gpu == nullptr);
m_gpu->SendCommandSyncWithProcessor(resolve);
m_buffer_cache.InvalidateMemory(vaddr, size);
m_texture_cache.InvalidateMemory(vaddr, size);
return true;
}
src/graphics/host_gpu/renderer/cache/resourceMutex.cpp
Vendored
+2 -48
View File
@@ -4,18 +4,10 @@
namespace Libs::Graphics {
ResourceMutex::FaultScope::FaultScope(ResourceMutex& mutex): m_mutex(mutex) {
m_resource_preowned = m_mutex.BeginFault();
}
ResourceMutex::FaultScope::~FaultScope() {
m_mutex.EndFault(m_resource_preowned);
}
ResourceMutex::~ResourceMutex() {
std::lock_guard state(m_state);
if (m_resource_owner != std::thread::id {} || m_fault_owner != std::thread::id {}) {
EXIT("ResourceMutex destroyed with an active owner or fault transaction\n");
if (m_resource_owner != std::thread::id {}) {
EXIT("ResourceMutex destroyed with an active owner\n");
}
}
@@ -26,9 +18,6 @@ void ResourceMutex::lock() {
if (m_resource_owner == current) {
EXIT("recursive resource transaction\n");
}
if (m_fault_owner == current) {
EXIT("resource transaction re-entered from a page-fault callback\n");
}
}
m_resource.lock();
std::lock_guard state(m_state);
@@ -55,39 +44,4 @@ bool ResourceMutex::IsOwnedByCurrentThread() {
return m_resource_owner == std::this_thread::get_id();
}
bool ResourceMutex::BeginFault() {
const auto current = std::this_thread::get_id();
{
std::lock_guard state(m_state);
if (m_fault_owner == current) {
EXIT("nested resource page-fault transaction\n");
}
if (m_resource_owner == current) {
m_fault_owner = current;
return true;
}
}
lock();
std::lock_guard state(m_state);
if (m_resource_owner != current || m_fault_owner != std::thread::id {}) {
EXIT("resource fault transaction acquired inconsistent ownership\n");
}
m_fault_owner = current;
return false;
}
void ResourceMutex::EndFault(bool resource_preowned) {
const auto current = std::this_thread::get_id();
{
std::lock_guard state(m_state);
if (m_fault_owner != current || m_resource_owner != current) {
EXIT("resource page-fault transaction ended with inconsistent ownership\n");
}
m_fault_owner = {};
}
if (!resource_preowned) {
unlock();
}
}
} // namespace Libs::Graphics
src/graphics/host_gpu/renderer/cache/resourceMutex.h
Vendored
+1 -19
View File
@@ -8,21 +8,9 @@
namespace Libs::Graphics {
// Owner-tracked shared buffer/image transaction. External faults pause GPU submissions first;
// command-processor faults drain pending guest processors before entering this transaction.
// Owner-tracked shared buffer/image transaction.
class ResourceMutex final {
public:
class FaultScope final {
public:
explicit FaultScope(ResourceMutex& mutex);
~FaultScope();
KYTY_CLASS_NO_COPY(FaultScope);
private:
ResourceMutex& m_mutex;
bool m_resource_preowned = false;
};
ResourceMutex() = default;
~ResourceMutex();
KYTY_CLASS_NO_COPY(ResourceMutex);
@@ -32,15 +20,9 @@ public:
[[nodiscard]] bool IsOwnedByCurrentThread();
private:
friend class FaultScope;
[[nodiscard]] bool BeginFault();
void EndFault(bool resource_preowned);
std::mutex m_resource;
std::mutex m_state;
std::thread::id m_resource_owner;
std::thread::id m_fault_owner;
};
} // namespace Libs::Graphics