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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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tests/MemoryTrackerTests.cpp
+51
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@@ -6,7 +6,9 @@
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <semaphore>
#include <string>
#include <thread>
#include <vector>
#if KYTY_PLATFORM == KYTY_PLATFORM_WINDOWS
@@ -265,6 +267,7 @@ void TestRangeInvalidation() {
flushes++;
tracker.ForEachDownloadRange<true>(address + 16, size - 32,
[](uint64_t, uint64_t) noexcept {});
tracker.MarkRegionAsCpuModified(address + 16, size - 32);
});
Check(flushes == 1 && !tracker.IsRegionGpuModified(address, size) &&
tracker.IsRegionCpuModified(address, size) && IsWritable(memory) &&
@@ -277,6 +280,53 @@ void TestRangeInvalidation() {
Release(page_manager, memory, size);
}
void TestGpuReacquisitionAfterInvalidation() {
TrackerHarness harness;
auto &tracker = harness.tracker;
auto &page_manager = harness.page_manager;
const auto page_size = page_manager.GetPageSize();
auto *memory = Allocate(page_manager, 1);
const auto address = reinterpret_cast<uint64_t>(memory);
tracker.ForEachUploadRange(
address, page_size, true, [](uint64_t, uint64_t) noexcept {},
[]() noexcept {});
Check(tracker.IsRegionGpuModified(address, page_size) &&
!tracker.IsRegionCpuModified(address, page_size),
"reacquisition setup did not establish GPU ownership");
uint32_t flushes = 0;
uint32_t uploads = 0;
std::binary_semaphore reacquire{0};
std::binary_semaphore reacquired{0};
std::jthread publisher([&] {
reacquire.acquire();
tracker.ForEachUploadRange(
address + 16, 32, true,
[&](uint64_t, uint64_t) noexcept { uploads++; }, []() noexcept {});
reacquired.release();
});
tracker.InvalidateRegion(address + 16, 32, [&] {
flushes++;
tracker.ForEachDownloadRange<true>(address + 16, 32,
[](uint64_t, uint64_t) noexcept {});
tracker.MarkRegionAsCpuModified(address + 16, 32);
reacquire.release();
reacquired.acquire();
});
publisher.join();
Check(flushes == 1 && uploads == 1 &&
tracker.IsRegionGpuModified(address, page_size) &&
!tracker.IsRegionCpuModified(address, page_size) &&
!IsWritable(memory),
"invalidation rejected a new generation of GPU ownership");
tracker.UnmarkRegionAsGpuModified(address, page_size);
tracker.MarkRegionAsCpuModified(address, page_size);
tracker.UntrackMemory(address, page_size);
Release(page_manager, memory, page_size);
}
void TestGpuDirtyBits() {
TrackerHarness harness;
auto &tracker = harness.tracker;
@@ -635,6 +685,7 @@ int main(int argc, char **argv) {
TestQueriesDoNotRequireMappedOwnership();
TestCpuDirtyUpload();
TestRangeInvalidation();
TestGpuReacquisitionAfterInvalidation();
TestGpuDirtyBits();
TestExactDirtyIntervalsSharingTrackerPage();
TestGpuDownloadProtectionMirrors();