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