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-rw-r--r--dom/base/nsJSEnvironment.cpp17
1 files changed, 14 insertions, 3 deletions
diff --git a/dom/base/nsJSEnvironment.cpp b/dom/base/nsJSEnvironment.cpp
index ebce7ea3f..3f28533d3 100644
--- a/dom/base/nsJSEnvironment.cpp
+++ b/dom/base/nsJSEnvironment.cpp
@@ -1355,9 +1355,20 @@ nsJSContext::RunCycleCollectorSlice()
TimeStamp now = TimeStamp::Now();
// Only run a limited slice if we're within the max running time.
- if (TimeBetween(gCCStats.mBeginTime, now) < kMaxICCDuration) {
- float sliceMultiplier = std::max(TimeBetween(gCCStats.mEndSliceTime, now) / (float)kICCIntersliceDelay, 1.0f);
- budget = js::SliceBudget(js::TimeBudget(kICCSliceBudget * sliceMultiplier));
+ uint32_t runningTime = TimeBetween(gCCStats.mBeginTime, now);
+ if (runningTime < kMaxICCDuration) {
+ // Try to make up for a delay in running this slice.
+ float sliceDelayMultiplier = TimeBetween(gCCStats.mEndSliceTime, now) / (float)kICCIntersliceDelay;
+ float delaySliceBudget = kICCSliceBudget * sliceDelayMultiplier;
+
+ // Increase slice budgets up to |maxLaterSlice| as we approach
+ // half way through the ICC, to avoid large sync CCs.
+ float percentToHalfDone = std::min(2.0f * runningTime / kMaxICCDuration, 1.0f);
+ const float maxLaterSlice = 40.0f;
+ float laterSliceBudget = maxLaterSlice * percentToHalfDone;
+
+ budget = js::SliceBudget(js::TimeBudget(std::max({delaySliceBudget,
+ laterSliceBudget, (float)kICCSliceBudget})));
}
}
}