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// Copyright (c) 2012 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 "chrome/browser/chrome_browser_field_trials.h"
#include <string>
#include "base/command_line.h"
#include "base/feature_list.h"
#include "base/metrics/field_trial.h"
#include "base/metrics/histogram_base.h"
#include "base/metrics/persistent_histogram_allocator.h"
#include "base/strings/string_util.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "chrome/common/chrome_switches.h"
#include "components/metrics/metrics_pref_names.h"
#if defined(OS_ANDROID)
#include "chrome/browser/chrome_browser_field_trials_mobile.h"
#else
#include "chrome/browser/chrome_browser_field_trials_desktop.h"
#endif
namespace {
// Check for feature enabling the use of persistent histogram storage and
// create an appropriate allocator for such if so.
void InstantiatePersistentHistograms() {
if (base::FeatureList::IsEnabled(base::kPersistentHistogramsFeature)) {
const char kAllocatorName[] = "BrowserMetrics";
// Create persistent/shared memory and allow histograms to be stored in it.
// Memory that is not actualy used won't be physically mapped by the system.
// BrowserMetrics usage peaked around 95% of 2MiB as of 2016-02-20.
base::PersistentHistogramAllocator::CreateGlobalAllocatorOnLocalMemory(
3 << 20, // 3 MiB
0x935DDD43, // SHA1(BrowserMetrics)
kAllocatorName);
base::PersistentHistogramAllocator::GetGlobalAllocator()
->CreateTrackingHistograms(kAllocatorName);
}
}
} // namespace
ChromeBrowserFieldTrials::ChromeBrowserFieldTrials(
const base::CommandLine& parsed_command_line)
: parsed_command_line_(parsed_command_line) {
}
ChromeBrowserFieldTrials::~ChromeBrowserFieldTrials() {
}
void ChromeBrowserFieldTrials::SetupFieldTrials() {
// Field trials that are shared by all platforms.
InstantiateDynamicTrials();
#if defined(OS_ANDROID)
chrome::SetupMobileFieldTrials(parsed_command_line_);
#else
chrome::SetupDesktopFieldTrials(parsed_command_line_);
#endif
}
void ChromeBrowserFieldTrials::InstantiateDynamicTrials() {
// Persistent histograms must be enabled as soon as possible.
InstantiatePersistentHistograms();
}
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