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[fuchsia] fix broken flows when under high load #16834

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farchond merged 1 commit into from
Mar 6, 2020
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[fuchsia] fix broken flows when under high load #16834

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7 changes: 4 additions & 3 deletions shell/platform/fuchsia/flutter/session_connection.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -95,14 +95,15 @@ void SessionConnection::Present(
flutter::CompositorContext::ScopedFrame* frame) {
TRACE_EVENT0("gfx", "SessionConnection::Present");

TRACE_FLOW_BEGIN("gfx", "SessionConnection::PresentSession",
next_present_session_trace_id_);
next_present_session_trace_id_++;

// Throttle frame submission to Scenic if we already have the maximum amount
// of frames in flight. This allows the paint tasks for this frame to execute
// in parallel with the presentation of previous frame but still provides
// back-pressure to prevent us from enqueuing even more work.
if (initialized_ && frames_in_flight_ < kMaxFramesInFlight) {
TRACE_FLOW_BEGIN("gfx", "SessionConnection::PresentSession",
next_present_session_trace_id_);
next_present_session_trace_id_++;
PresentSession();
} else {
// We should never exceed the max frames in flight.
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