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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
client/src/main.c
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@@ -217,9 +217,10 @@ struct FrameTimingRecord
uint64_t frameSerial;
uint32_t scheduleGeneration;
uint32_t scheduleEpoch;
uint32_t scheduleDeadlineSerial;
unsigned readyMask;
bool producerValid;
bool scheduleOwner;
bool phaseValid;
uint64_t captureTime;
uint64_t postProcessTime;
@@ -330,9 +331,8 @@ static void frameTimingCancel(LG_RendererFrameToken token)
}
static void frameTimingQueue(LG_RendererFrameToken token, uint64_t frameSerial,
uint32_t scheduleGeneration, uint32_t scheduleEpoch, bool scheduleOwner,
uint64_t importTime, uint64_t importWaitTime, uint64_t dispatchStart,
uint64_t queueStart)
const LG_TransportFrameTiming * timing, uint64_t importTime,
uint64_t importWaitTime, uint64_t dispatchStart, uint64_t queueStart)
{
INTERLOCKED_SECTION(l_frameTiming.lock, {
struct FrameTimingRecord * record = frameTimingRecord(token);
@@ -341,14 +341,16 @@ static void frameTimingQueue(LG_RendererFrameToken token, uint64_t frameSerial,
const uint64_t elapsed = queueStart > dispatchStart ?
queueStart - dispatchStart : 0;
const uint64_t accounted = importTime + importWaitTime;
record->importTime = importTime;
record->importWaitTime = importWaitTime;
record->dispatchTime = elapsed > accounted ? elapsed - accounted : 0;
record->queueStart = queueStart;
record->frameSerial = frameSerial;
record->scheduleGeneration = scheduleGeneration;
record->scheduleEpoch = scheduleEpoch;
record->scheduleOwner = scheduleOwner;
record->importTime = importTime;
record->importWaitTime = importWaitTime;
record->dispatchTime = elapsed > accounted ?
elapsed - accounted : 0;
record->queueStart = queueStart;
record->frameSerial = frameSerial;
record->scheduleGeneration = timing->scheduleGeneration;
record->scheduleEpoch = timing->scheduleEpoch;
record->scheduleDeadlineSerial = timing->scheduleDeadlineSerial;
record->phaseValid = timing->phaseValid;
if (record->timestamp < queueStart)
record->timestamp = queueStart;
}
@@ -398,7 +400,8 @@ static void frameTimingFinishRender(const LG_RendererFrameTiming * timing,
uint64_t feedbackQueueStart = 0;
uint32_t feedbackGeneration = 0;
uint32_t feedbackEpoch = 0;
bool feedbackOwner = false;
uint32_t feedbackDeadline = 0;
bool feedbackValid = false;
LG_LOCK(l_frameTiming.lock);
if (l_frameTiming.retireToken <= timing->frameToken)
@@ -421,7 +424,8 @@ static void frameTimingFinishRender(const LG_RendererFrameTiming * timing,
feedbackFrameSerial = record->frameSerial;
feedbackGeneration = record->scheduleGeneration;
feedbackEpoch = record->scheduleEpoch;
feedbackOwner = record->scheduleOwner;
feedbackDeadline = record->scheduleDeadlineSerial;
feedbackValid = record->phaseValid;
feedbackQueueStart = record->queueStart;
if (unlikely(
@@ -445,13 +449,13 @@ static void frameTimingFinishRender(const LG_RendererFrameTiming * timing,
}
LG_UNLOCK(l_frameTiming.lock);
if (g_state.jitRender && feedbackOwner && feedbackFrameSerial &&
feedbackGeneration && feedbackEpoch && feedbackQueueStart &&
prepareStart >= feedbackQueueStart)
if (g_state.jitRender && feedbackValid && feedbackFrameSerial &&
feedbackGeneration && feedbackEpoch && feedbackDeadline &&
feedbackQueueStart && prepareStart >= feedbackQueueStart)
{
frameScheduler_feedback(
feedbackFrameSerial, feedbackGeneration, feedbackEpoch,
prepareStart - feedbackQueueStart);
feedbackDeadline, prepareStart - feedbackQueueStart);
}
}
@@ -1143,9 +1147,9 @@ int main_frameThread(void * unused)
atomic_store_explicit(&l_testFrameSerial, frame.serial,
memory_order_release);
#endif
frameTimingQueue(frameToken, frame.serial, frame.scheduleGeneration,
frame.scheduleEpoch, frame.scheduleOwner, g_state.frameImportTime,
g_state.frameImportWaitTime, dispatchStart, queueStart);
frameTimingQueue(frameToken, frame.serial, &timing,
g_state.frameImportTime, g_state.frameImportWaitTime,
dispatchStart, queueStart);
if (g_state.jitRender)
{