Ryujinx/Ryujinx.Memory.Tests/TrackingTests.cs
riperiperi a539303e71
Remove unused physical region tracking (#2085)
* Remove unused physical region tracking

* Update comments
2021-03-06 20:21:53 -03:00

453 lines
16 KiB
C#

using NUnit.Framework;
using Ryujinx.Memory.Tracking;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
namespace Ryujinx.Memory.Tests
{
public class TrackingTests
{
private const int RndCnt = 3;
private const ulong MemorySize = 0x8000;
private const int PageSize = 4096;
private MemoryBlock _memoryBlock;
private MemoryTracking _tracking;
private MockVirtualMemoryManager _memoryManager;
[SetUp]
public void Setup()
{
_memoryBlock = new MemoryBlock(MemorySize);
_memoryManager = new MockVirtualMemoryManager(MemorySize, PageSize);
_tracking = new MemoryTracking(_memoryManager, _memoryBlock, PageSize);
}
[TearDown]
public void Teardown()
{
_memoryBlock.Dispose();
}
private bool TestSingleWrite(RegionHandle handle, ulong address, ulong size)
{
handle.Reprotect();
_tracking.VirtualMemoryEvent(address, size, true);
return handle.Dirty;
}
[Test]
public void SingleRegion()
{
RegionHandle handle = _tracking.BeginTracking(0, PageSize);
(ulong address, ulong size)? readTrackingTriggered = null;
handle.RegisterAction((address, size) =>
{
readTrackingTriggered = (address, size);
});
bool dirtyInitial = handle.Dirty;
Assert.True(dirtyInitial); // Handle starts dirty.
handle.Reprotect();
bool dirtyAfterReprotect = handle.Dirty;
Assert.False(dirtyAfterReprotect); // Handle is no longer dirty.
_tracking.VirtualMemoryEvent(PageSize * 2, 4, true);
_tracking.VirtualMemoryEvent(PageSize * 2, 4, false);
bool dirtyAfterUnrelatedReadWrite = handle.Dirty;
Assert.False(dirtyAfterUnrelatedReadWrite); // Not dirtied, as the write was to an unrelated address.
Assert.IsNull(readTrackingTriggered); // Hasn't been triggered yet
_tracking.VirtualMemoryEvent(0, 4, false);
bool dirtyAfterRelatedRead = handle.Dirty;
Assert.False(dirtyAfterRelatedRead); // Only triggers on write.
Assert.AreEqual(readTrackingTriggered, (0UL, 4UL)); // Read action was triggered.
readTrackingTriggered = null;
_tracking.VirtualMemoryEvent(0, 4, true);
bool dirtyAfterRelatedWrite = handle.Dirty;
Assert.True(dirtyAfterRelatedWrite); // Dirty flag should now be set.
_tracking.VirtualMemoryEvent(4, 4, true);
bool dirtyAfterRelatedWrite2 = handle.Dirty;
Assert.True(dirtyAfterRelatedWrite2); // Dirty flag should still be set.
handle.Reprotect();
bool dirtyAfterReprotect2 = handle.Dirty;
Assert.False(dirtyAfterReprotect2); // Handle is no longer dirty.
handle.Dispose();
bool dirtyAfterDispose = TestSingleWrite(handle, 0, 4);
Assert.False(dirtyAfterDispose); // Handle cannot be triggered when disposed
}
[Test]
public void OverlappingRegions()
{
RegionHandle allHandle = _tracking.BeginTracking(0, PageSize * 16);
allHandle.Reprotect();
(ulong address, ulong size)? readTrackingTriggeredAll = null;
Action registerReadAction = () =>
{
readTrackingTriggeredAll = null;
allHandle.RegisterAction((address, size) =>
{
readTrackingTriggeredAll = (address, size);
});
};
registerReadAction();
// Create 16 page sized handles contained within the allHandle.
RegionHandle[] containedHandles = new RegionHandle[16];
for (int i = 0; i < 16; i++)
{
containedHandles[i] = _tracking.BeginTracking((ulong)i * PageSize, PageSize);
containedHandles[i].Reprotect();
}
for (int i = 0; i < 16; i++)
{
// No handles are dirty.
Assert.False(allHandle.Dirty);
Assert.IsNull(readTrackingTriggeredAll);
for (int j = 0; j < 16; j++)
{
Assert.False(containedHandles[j].Dirty);
}
_tracking.VirtualMemoryEvent((ulong)i * PageSize, 1, true);
// Only the handle covering the entire range and the relevant contained handle are dirty.
Assert.True(allHandle.Dirty);
Assert.AreEqual(readTrackingTriggeredAll, ((ulong)i * PageSize, 1UL)); // Triggered read tracking
for (int j = 0; j < 16; j++)
{
if (j == i)
{
Assert.True(containedHandles[j].Dirty);
}
else
{
Assert.False(containedHandles[j].Dirty);
}
}
// Clear flags and reset read action.
registerReadAction();
allHandle.Reprotect();
containedHandles[i].Reprotect();
}
}
[Test]
public void PageAlignment(
[Values(1ul, 512ul, 2048ul, 4096ul, 65536ul)] [Random(1ul, 65536ul, RndCnt)] ulong address,
[Values(1ul, 4ul, 1024ul, 4096ul, 65536ul)] [Random(1ul, 65536ul, RndCnt)] ulong size)
{
ulong alignedStart = (address / PageSize) * PageSize;
ulong alignedEnd = ((address + size + PageSize - 1) / PageSize) * PageSize;
ulong alignedSize = alignedEnd - alignedStart;
RegionHandle handle = _tracking.BeginTracking(address, size);
// Anywhere inside the pages the region is contained on should trigger.
bool originalRangeTriggers = TestSingleWrite(handle, address, size);
Assert.True(originalRangeTriggers);
bool alignedRangeTriggers = TestSingleWrite(handle, alignedStart, alignedSize);
Assert.True(alignedRangeTriggers);
bool alignedStartTriggers = TestSingleWrite(handle, alignedStart, 1);
Assert.True(alignedStartTriggers);
bool alignedEndTriggers = TestSingleWrite(handle, alignedEnd - 1, 1);
Assert.True(alignedEndTriggers);
// Outside the tracked range should not trigger.
bool alignedBeforeTriggers = TestSingleWrite(handle, alignedStart - 1, 1);
Assert.False(alignedBeforeTriggers);
bool alignedAfterTriggers = TestSingleWrite(handle, alignedEnd, 1);
Assert.False(alignedAfterTriggers);
}
[Test, Timeout(1000)]
public void Multithreading()
{
// Multithreading sanity test
// Multiple threads can easily read/write memory regions from any existing handle.
// Handles can also be owned by different threads, though they should have one owner thread.
// Handles can be created and disposed at any time, by any thread.
// This test should not throw or deadlock due to invalid state.
const int threadCount = 1;
const int handlesPerThread = 16;
long finishedTime = 0;
RegionHandle[] handles = new RegionHandle[threadCount * handlesPerThread];
Random globalRand = new Random();
for (int i = 0; i < handles.Length; i++)
{
handles[i] = _tracking.BeginTracking((ulong)i * PageSize, PageSize);
handles[i].Reprotect();
}
List<Thread> testThreads = new List<Thread>();
// Dirty flag consumer threads
int dirtyFlagReprotects = 0;
for (int i = 0; i < threadCount; i++)
{
int randSeed = i;
testThreads.Add(new Thread(() =>
{
int handleBase = randSeed * handlesPerThread;
while (Stopwatch.GetTimestamp() < finishedTime)
{
Random random = new Random(randSeed);
RegionHandle handle = handles[handleBase + random.Next(handlesPerThread)];
if (handle.Dirty)
{
handle.Reprotect();
Interlocked.Increment(ref dirtyFlagReprotects);
}
}
}));
}
// Write trigger threads
int writeTriggers = 0;
for (int i = 0; i < threadCount; i++)
{
int randSeed = i;
testThreads.Add(new Thread(() =>
{
Random random = new Random(randSeed);
ulong handleBase = (ulong)(randSeed * handlesPerThread * PageSize);
while (Stopwatch.GetTimestamp() < finishedTime)
{
_tracking.VirtualMemoryEvent(handleBase + (ulong)random.Next(PageSize * handlesPerThread), PageSize / 2, true);
Interlocked.Increment(ref writeTriggers);
}
}));
}
// Handle create/delete threads
int handleLifecycles = 0;
for (int i = 0; i < threadCount; i++)
{
int randSeed = i;
testThreads.Add(new Thread(() =>
{
int maxAddress = threadCount * handlesPerThread * PageSize;
Random random = new Random(randSeed + 512);
while (Stopwatch.GetTimestamp() < finishedTime)
{
RegionHandle handle = _tracking.BeginTracking((ulong)random.Next(maxAddress), (ulong)random.Next(65536));
handle.Dispose();
Interlocked.Increment(ref handleLifecycles);
}
}));
}
finishedTime = Stopwatch.GetTimestamp() + Stopwatch.Frequency / 2; // Run for 500ms;
foreach (Thread thread in testThreads)
{
thread.Start();
}
foreach (Thread thread in testThreads)
{
thread.Join();
}
Assert.Greater(dirtyFlagReprotects, 10);
Assert.Greater(writeTriggers, 10);
Assert.Greater(handleLifecycles, 10);
}
[Test]
public void ReadActionThreadConsumption()
{
// Read actions should only be triggered once for each registration.
// The implementation should use an interlocked exchange to make sure other threads can't get the action.
RegionHandle handle = _tracking.BeginTracking(0, PageSize);
int triggeredCount = 0;
int registeredCount = 0;
int signalThreadsDone = 0;
bool isRegistered = false;
Action registerReadAction = () =>
{
registeredCount++;
handle.RegisterAction((address, size) =>
{
isRegistered = false;
Interlocked.Increment(ref triggeredCount);
});
};
const int threadCount = 16;
const int iterationCount = 10000;
Thread[] signalThreads = new Thread[threadCount];
for (int i = 0; i < threadCount; i++)
{
int randSeed = i;
signalThreads[i] = new Thread(() =>
{
Random random = new Random(randSeed);
for (int j = 0; j < iterationCount; j++)
{
_tracking.VirtualMemoryEvent((ulong)random.Next(PageSize), 4, false);
}
Interlocked.Increment(ref signalThreadsDone);
});
}
for (int i = 0; i < threadCount; i++)
{
signalThreads[i].Start();
}
while (signalThreadsDone != -1)
{
if (signalThreadsDone == threadCount)
{
signalThreadsDone = -1;
}
if (!isRegistered)
{
isRegistered = true;
registerReadAction();
}
}
// The action should trigger exactly once for every registration,
// then we register once after all the threads signalling it cease.
Assert.AreEqual(registeredCount, triggeredCount + 1);
}
[Test]
public void DisposeHandles()
{
// Ensure that disposed handles correctly remove their virtual and physical regions.
RegionHandle handle = _tracking.BeginTracking(0, PageSize);
handle.Reprotect();
Assert.AreEqual(1, _tracking.GetRegionCount());
handle.Dispose();
Assert.AreEqual(0, _tracking.GetRegionCount());
// Two handles, small entirely contains big.
// We expect there to be three regions after creating both, one for the small region and two covering the big one around it.
// Regions are always split to avoid overlapping, which is why there are three instead of two.
RegionHandle handleSmall = _tracking.BeginTracking(PageSize, PageSize);
RegionHandle handleBig = _tracking.BeginTracking(0, PageSize * 4);
Assert.AreEqual(3, _tracking.GetRegionCount());
// After disposing the big region, only the small one will remain.
handleBig.Dispose();
Assert.AreEqual(1, _tracking.GetRegionCount());
handleSmall.Dispose();
Assert.AreEqual(0, _tracking.GetRegionCount());
}
[Test]
public void ReadAndWriteProtection()
{
MemoryPermission protection = MemoryPermission.ReadAndWrite;
_memoryManager.OnProtect += (va, size, newProtection) =>
{
Assert.AreEqual((0, PageSize), (va, size)); // Should protect the exact region all the operations use.
protection = newProtection;
};
RegionHandle handle = _tracking.BeginTracking(0, PageSize);
// After creating the handle, there is no protection yet.
Assert.AreEqual(MemoryPermission.ReadAndWrite, protection);
bool dirtyInitial = handle.Dirty;
Assert.True(dirtyInitial); // Handle starts dirty.
handle.Reprotect();
// After a reprotect, there is write protection, which will set a dirty flag when any write happens.
Assert.AreEqual(MemoryPermission.Read, protection);
(ulong address, ulong size)? readTrackingTriggered = null;
handle.RegisterAction((address, size) =>
{
readTrackingTriggered = (address, size);
});
// Registering an action adds read/write protection.
Assert.AreEqual(MemoryPermission.None, protection);
bool dirtyAfterReprotect = handle.Dirty;
Assert.False(dirtyAfterReprotect); // Handle is no longer dirty.
// First we should read, which will trigger the action. This _should not_ remove write protection on the memory.
_tracking.VirtualMemoryEvent(0, 4, false);
bool dirtyAfterRead = handle.Dirty;
Assert.False(dirtyAfterRead); // Not dirtied, as this was a read.
Assert.AreEqual(readTrackingTriggered, (0UL, 4UL)); // Read action was triggered.
Assert.AreEqual(MemoryPermission.Read, protection); // Write protection is still present.
readTrackingTriggered = null;
// Now, perform a write.
_tracking.VirtualMemoryEvent(0, 4, true);
bool dirtyAfterWriteAfterRead = handle.Dirty;
Assert.True(dirtyAfterWriteAfterRead); // Should be dirty.
Assert.AreEqual(MemoryPermission.ReadAndWrite, protection); // All protection is now be removed from the memory.
Assert.IsNull(readTrackingTriggered); // Read tracking was removed when the action fired, as it can only fire once.
handle.Dispose();
}
}
}