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[client/host/idd/obs] scheduler: validate phase feedback

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Bump KVMFR to version 28 and attach generation, epoch, and deadline
identities to cadence deliveries and their timing records.

Accept phase corrections only for the exact completed publication. Keep
VM and client clocks independent by exchanging relative phase errors.

Make submission, completion, and work-estimate accounting best effort
so scheduler state cannot delay GPU submission or frame publication.
This commit is contained in:
Geoffrey McRae
2026-08-06 16:05:05 +10:00
parent 983cf588e3
commit 515f4ba06f
16 changed files with 688 additions and 235 deletions
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46
idd/LGIdd/CFrameScheduler.h
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@@ -39,8 +39,12 @@ public:
uint32_t epoch;
uint64_t period;
uint64_t targetSlack;
uint64_t deadline;
uint64_t forceTicket;
uint64_t republishTicket;
uint32_t deadlineSerial;
uint32_t deliveryDeadlineSerial;
bool phaseEligible;
};
private:
@@ -52,7 +56,7 @@ private:
uint64_t targetSlack;
uint64_t expiry;
uint64_t nextDelivery;
uint32_t lastFeedbackFrameSerial;
uint32_t lastFeedbackDeadlineSerial;
uint32_t lastDeliveredFrameSerial;
bool subscribed;
bool ownerCapable;
@@ -62,6 +66,21 @@ private:
bool deliveredFrameValid;
};
struct Publication
{
uint32_t generation;
uint32_t epoch;
uint32_t deadlineSerial;
uint32_t frameSerial;
uint64_t deadline;
bool committed;
bool completed;
bool phaseValid;
bool accepted;
};
static const unsigned PUBLICATION_HISTORY_SIZE = 128;
mutable SRWLOCK m_lock = SRWLOCK_INIT;
HANDLE m_wakeEvent = nullptr;
Client m_clients[LGMP_MAX_CLIENTS] = {};
@@ -75,12 +94,15 @@ private:
uint64_t m_republishRequestTicket = 0;
uint64_t m_republishAckTicket = 0;
uint64_t m_lastArrival = 0;
uint64_t m_guestPeriod = 0;
uint64_t m_workEstimate = 0;
uint64_t m_nextDeadline = 0;
uint64_t m_lastArrival = 0;
uint64_t m_guestPeriod = 0;
uint64_t m_workEstimate = 0;
uint64_t m_nextDeadline = 0;
uint32_t m_deadlineSerial = 0;
int64_t m_pendingCorrection = 0;
uint32_t m_lastPublishedFrameSerial = 0;
Publication m_publications[PUBLICATION_HISTORY_SIZE] = {};
unsigned m_publicationIndex = 0;
int64_t m_lastPhaseError = 0;
uint64_t m_acquiredFrames = 0;
@@ -92,8 +114,12 @@ private:
uint64_t m_lastLogPublished = 0;
Client * FindClient(uint32_t clientID);
bool ElectOwner(uint64_t now);
Publication * FindPublication(const Schedule& schedule,
uint32_t frameSerial);
bool ElectOwner(uint64_t now, uint32_t resetClientID = 0);
bool ApplyFeedback(Client& client, const KVMFRFrameSchedule& schedule);
void AdvanceCurrentDeadline();
void AdvanceDeadlineSerial(uint64_t count);
void AdvanceDeadline(uint64_t now);
static void AdvanceDelivery(Client& client, uint64_t now);
void WakePublisher() const;
@@ -115,10 +141,14 @@ public:
void ForceFrame();
bool GetPublishTarget(uint64_t now, uint64_t& target,
Schedule& schedule, bool& periodic, bool& republish);
void FrameMissed(const Schedule& schedule, uint64_t now, bool periodic);
void FrameSuperseded();
bool TryFrameSubmitted(const Schedule& schedule, uint32_t frameSerial);
void FramePublished(const Schedule& schedule, uint32_t frameSerial,
uint64_t now, bool periodic);
void FrameRepublished(const Schedule& schedule, uint32_t frameSerial);
bool TryFrameCompleted(const Schedule& schedule, uint32_t frameSerial,
uint64_t completedAt);
unsigned GetSecondaryRecipients(const uint32_t * clientIDs,
unsigned count, uint32_t frameSerial, uint64_t now,
uint32_t * recipients) const;
@@ -128,6 +158,6 @@ public:
void FrameDelivered(const uint32_t * clientIDs, unsigned count,
uint32_t frameSerial, uint64_t now);
void NotifyPublisher() const { WakePublisher(); }
void RecordFrameTiming(uint64_t duration);
void TryRecordFrameTiming(uint64_t duration);
void LogStatistics(uint64_t now);
};