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119 lines
3.9 KiB
C++
119 lines
3.9 KiB
C++
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/trace_event/memory_dump_scheduler.h"
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#include <algorithm>
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#include <limits>
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#include "base/bind.h"
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#include "base/logging.h"
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#include "base/threading/sequenced_task_runner_handle.h"
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namespace base {
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namespace trace_event {
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// static
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MemoryDumpScheduler* MemoryDumpScheduler::GetInstance() {
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static MemoryDumpScheduler* instance = new MemoryDumpScheduler();
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return instance;
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}
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MemoryDumpScheduler::MemoryDumpScheduler() : period_ms_(0), generation_(0) {}
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MemoryDumpScheduler::~MemoryDumpScheduler() {
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// Hit only in tests. Check that tests don't leave without stopping.
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DCHECK(!is_enabled_for_testing());
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}
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void MemoryDumpScheduler::Start(
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MemoryDumpScheduler::Config config,
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scoped_refptr<SequencedTaskRunner> task_runner) {
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DCHECK(!task_runner_);
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task_runner_ = task_runner;
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task_runner->PostTask(FROM_HERE, BindOnce(&MemoryDumpScheduler::StartInternal,
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Unretained(this), config));
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}
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void MemoryDumpScheduler::Stop() {
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if (!task_runner_)
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return;
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task_runner_->PostTask(FROM_HERE, BindOnce(&MemoryDumpScheduler::StopInternal,
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Unretained(this)));
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task_runner_ = nullptr;
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}
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void MemoryDumpScheduler::StartInternal(MemoryDumpScheduler::Config config) {
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uint32_t light_dump_period_ms = 0;
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uint32_t heavy_dump_period_ms = 0;
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uint32_t min_period_ms = std::numeric_limits<uint32_t>::max();
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for (const Config::Trigger& trigger : config.triggers) {
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DCHECK_GT(trigger.period_ms, 0u);
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switch (trigger.level_of_detail) {
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case MemoryDumpLevelOfDetail::BACKGROUND:
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break;
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case MemoryDumpLevelOfDetail::LIGHT:
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DCHECK_EQ(0u, light_dump_period_ms);
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light_dump_period_ms = trigger.period_ms;
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break;
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case MemoryDumpLevelOfDetail::DETAILED:
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DCHECK_EQ(0u, heavy_dump_period_ms);
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heavy_dump_period_ms = trigger.period_ms;
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break;
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}
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min_period_ms = std::min(min_period_ms, trigger.period_ms);
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}
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DCHECK_EQ(0u, light_dump_period_ms % min_period_ms);
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DCHECK_EQ(0u, heavy_dump_period_ms % min_period_ms);
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DCHECK(!config.callback.is_null());
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callback_ = config.callback;
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period_ms_ = min_period_ms;
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tick_count_ = 0;
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light_dump_rate_ = light_dump_period_ms / min_period_ms;
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heavy_dump_rate_ = heavy_dump_period_ms / min_period_ms;
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// Trigger the first dump after 200ms.
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// TODO(lalitm): this is a tempoarary hack to delay the first scheduled dump
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// so that the child processes get tracing enabled notification via IPC.
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// See crbug.com/770151.
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SequencedTaskRunnerHandle::Get()->PostDelayedTask(
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FROM_HERE,
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BindOnce(&MemoryDumpScheduler::Tick, Unretained(this), ++generation_),
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TimeDelta::FromMilliseconds(200));
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}
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void MemoryDumpScheduler::StopInternal() {
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period_ms_ = 0;
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generation_++;
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callback_.Reset();
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}
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void MemoryDumpScheduler::Tick(uint32_t expected_generation) {
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if (period_ms_ == 0 || generation_ != expected_generation)
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return;
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MemoryDumpLevelOfDetail level_of_detail = MemoryDumpLevelOfDetail::BACKGROUND;
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if (light_dump_rate_ > 0 && tick_count_ % light_dump_rate_ == 0)
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level_of_detail = MemoryDumpLevelOfDetail::LIGHT;
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if (heavy_dump_rate_ > 0 && tick_count_ % heavy_dump_rate_ == 0)
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level_of_detail = MemoryDumpLevelOfDetail::DETAILED;
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tick_count_++;
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callback_.Run(level_of_detail);
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SequencedTaskRunnerHandle::Get()->PostDelayedTask(
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FROM_HERE,
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BindOnce(&MemoryDumpScheduler::Tick, Unretained(this),
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expected_generation),
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TimeDelta::FromMilliseconds(period_ms_));
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}
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MemoryDumpScheduler::Config::Config() {}
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MemoryDumpScheduler::Config::~Config() {}
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MemoryDumpScheduler::Config::Config(const MemoryDumpScheduler::Config&) =
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default;
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} // namespace trace_event
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} // namespace base
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