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[idd] scheduler: retain frames behind stalled owners

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Keep preparing the newest frame when both private owner lanes remain
referenced by a non-consuming timing client. Reuse only an unreferenced
completed buffer and continue serving eligible shared subscribers.

Track owner delivery separately from local retention so cadence advances
without acknowledging owner delivery or accepting phase feedback. Republish
the newest completed frame as soon as an owner lane becomes available.
This commit is contained in:
Geoffrey McRae
2026-08-06 16:56:25 +10:00
parent 05fe4f1dd8
commit ece6afd74e
5 changed files with 210 additions and 48 deletions
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24
idd/LGIdd/CIndirectDeviceContext.h
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@@ -110,11 +110,13 @@ private:
size_t m_alignSize = 0;
size_t m_frameMemoryOffset = 0;
size_t m_maxFrameSize = 0;
// LGMP publication precedes copy completion, so only the ready index is safe
// to retain and replay.
std::atomic<LONG> m_submittedFrameIndex = -1;
std::atomic<LONG> m_readyFrameIndex = -1;
// LGMP publication precedes copy completion. Replay only completed frames;
// the deferred index tracks the newest frame still owed to the owner.
std::atomic<LONG> m_submittedFrameIndex = -1;
std::atomic<LONG> m_readyFrameIndex = -1;
LONG m_deferredOwnerFrameIndex = -1;
std::atomic<bool> m_frameInFlight[LGMP_Q_FRAME_BUFFER_LEN] = {};
bool m_frameCompleted[LGMP_Q_FRAME_BUFFER_LEN] = {};
SRWLOCK m_framePublishLock = SRWLOCK_INIT;
uint64_t m_framePublishSequence = 0;
uint64_t m_frameLastPublishSequence[LGMP_Q_FRAME_BUFFER_LEN] = {};
@@ -190,7 +192,9 @@ private:
void DeInitLGMP();
void LGMPTimer();
void ProcessFrameDeliveries();
int FindAvailableFrameBuffer() const;
bool FrameBufferReferenced(unsigned frameIndex) const;
int FindAvailableFrameBuffer(bool allowReady) const;
int FindNewestCompletedFrame(unsigned excludeFrameIndex) const;
int FindAvailableOwnerQueue(unsigned preferredIndex) const;
unsigned CountOwnerDeliveries(uint32_t clientID) const;
bool HasMatchingOwnerDelivery(uint32_t clientID, unsigned frameIndex,
@@ -278,14 +282,18 @@ public:
void ProcessFrameQueue();
bool GetSharedFrameTarget(uint64_t now, uint64_t& target);
bool ReplaySharedFrame(uint64_t now, bool& retry);
PreparedFrameBuffer PrepareFrameBuffer(unsigned pitch, const D12FrameFormat& srcFormat, const D12FrameFormat& dstFormat, const RECT * dirtyRects, unsigned nbDirtyRects);
bool PublishFrameBuffer(unsigned frameIndex,
PreparedFrameBuffer PrepareFrameBuffer(unsigned pitch,
const D12FrameFormat& srcFormat, const D12FrameFormat& dstFormat,
const RECT * dirtyRects, unsigned nbDirtyRects,
const CFrameScheduler::Schedule& schedule);
bool PublishFrameBuffer(unsigned frameIndex,
const CFrameScheduler::Schedule& schedule, bool& deliveredToOwner);
bool RepublishFrameBuffer(const CFrameScheduler::Schedule& schedule);
bool TryFrameSubmitted(unsigned frameIndex,
const CFrameScheduler::Schedule& schedule);
void CommitFrameBuffer(unsigned frameIndex,
const CFrameScheduler::Schedule& schedule, bool periodic);
const CFrameScheduler::Schedule& schedule, bool periodic,
bool deliveredToOwner);
void AbortFrameBuffer(unsigned frameIndex);
void FailFrameBuffer(unsigned frameIndex);
void CompleteFrameBuffer(unsigned frameIndex, bool succeeded);