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[idd] scheduler: skip expired publication slots

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Advance past cadence deadlines whose publication targets have already
expired after a completed periodic frame.

Use the same slack, work, and safety lead as target selection so the next
publisher wait cannot immediately expire again.
This commit is contained in:
Geoffrey McRae
2026-08-06 14:52:48 +10:00
parent f65ecdaf5d
commit 983cf588e3
1 changed files with 12 additions and 5 deletions
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17
idd/LGIdd/CFrameScheduler.cpp
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@@ -31,6 +31,12 @@ static const uint64_t MIN_SAFETY_NS = 250000ULL;
static const uint64_t LOG_INTERVAL_NS = 5000000000ULL;
static const uint64_t CADENCE_BREAK = 4;
static uint64_t PublicationLead(uint64_t targetSlack, uint64_t workEstimate)
{
const uint64_t safety = max(MIN_SAFETY_NS, workEstimate / 8);
return targetSlack + workEstimate + safety;
}
CFrameScheduler::CFrameScheduler()
{
m_wakeEvent = CreateEvent(nullptr, FALSE, FALSE, nullptr);
@@ -420,11 +426,14 @@ bool CFrameScheduler::ApplyFeedback(Client& client,
void CFrameScheduler::AdvanceDeadline(uint64_t now)
{
if (m_nextDeadline > now)
const uint64_t lead =
PublicationLead(m_schedule.targetSlack, m_workEstimate);
const uint64_t target = now + lead;
if (m_nextDeadline > target)
return;
const uint64_t periods =
(now - m_nextDeadline) / m_schedule.period + 1;
(target - m_nextDeadline) / m_schedule.period + 1;
m_nextDeadline += periods * m_schedule.period;
}
@@ -511,10 +520,8 @@ bool CFrameScheduler::GetPublishTarget(uint64_t now, uint64_t& target,
schedule.republishTicket = m_republishRequestTicket;
republish = schedule.republishTicket != m_republishAckTicket;
const uint64_t safety =
max(MIN_SAFETY_NS, m_workEstimate / 8);
const uint64_t lead =
m_schedule.targetSlack + m_workEstimate + safety;
PublicationLead(m_schedule.targetSlack, m_workEstimate);
const uint64_t periodicTarget = m_nextDeadline > lead ?
m_nextDeadline - lead : now;