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// Copyright 2017 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "src/heap/stress-scavenge-observer.h" #include "src/base/utils/random-number-generator.h" #include "src/execution/isolate.h" #include "src/heap/heap-inl.h" #include "src/heap/spaces.h" namespace v8 { namespace internal { // TODO(majeski): meaningful step_size StressScavengeObserver::StressScavengeObserver(Heap* heap) : AllocationObserver(64), heap_(heap), has_requested_gc_(false), max_new_space_size_reached_(0.0) { limit_percentage_ = NextLimit(); if (FLAG_trace_stress_scavenge && !FLAG_fuzzer_gc_analysis) { heap_->isolate()->PrintWithTimestamp( "[StressScavenge] %d%% is the new limit\n", limit_percentage_); } } void StressScavengeObserver::Step(int bytes_allocated, Address soon_object, size_t size) { if (has_requested_gc_ || heap_->new_space()->Capacity() == 0) { return; } double current_percent = heap_->new_space()->Size() * 100.0 / heap_->new_space()->Capacity(); if (FLAG_trace_stress_scavenge) { heap_->isolate()->PrintWithTimestamp( "[Scavenge] %.2lf%% of the new space capacity reached\n", current_percent); } if (FLAG_fuzzer_gc_analysis) { max_new_space_size_reached_ = std::max(max_new_space_size_reached_, current_percent); return; } if (static_cast<int>(current_percent) >= limit_percentage_) { if (FLAG_trace_stress_scavenge) { heap_->isolate()->PrintWithTimestamp("[Scavenge] GC requested\n"); } has_requested_gc_ = true; heap_->isolate()->stack_guard()->RequestGC(); } } bool StressScavengeObserver::HasRequestedGC() const { return has_requested_gc_; } void StressScavengeObserver::RequestedGCDone() { double current_percent = heap_->new_space()->Size() * 100.0 / heap_->new_space()->Capacity(); limit_percentage_ = NextLimit(static_cast<int>(current_percent)); if (FLAG_trace_stress_scavenge) { heap_->isolate()->PrintWithTimestamp( "[Scavenge] %.2lf%% of the new space capacity reached\n", current_percent); heap_->isolate()->PrintWithTimestamp("[Scavenge] %d%% is the new limit\n", limit_percentage_); } has_requested_gc_ = false; } double StressScavengeObserver::MaxNewSpaceSizeReached() const { return max_new_space_size_reached_; } int StressScavengeObserver::NextLimit(int min) { int max = FLAG_stress_scavenge; if (min >= max) { return max; } return min + heap_->isolate()->fuzzer_rng()->NextInt(max - min + 1); } } // namespace internal } // namespace v8