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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/memory_details.h"
#include <stddef.h>
#include <sys/types.h>
#include <unistd.h>
#include <map>
#include <memory>
#include <set>
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/process/process_iterator.h"
#include "base/process/process_metrics.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/threading/scoped_blocking_call.h"
#include "build/build_config.h"
#include "chrome/common/chrome_constants.h"
#include "chrome/grit/branded_strings.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/common/process_type.h"
#include "ui/base/l10n/l10n_util.h"
using base::ProcessEntry;
namespace {
struct Process {
pid_t pid;
pid_t parent;
};
typedef std::map<pid_t, Process> ProcessMap;
// Get information on all the processes running on the system.
ProcessMap GetProcesses() {
ProcessMap map;
base::ProcessIterator process_iter(nullptr);
while (const ProcessEntry* process_entry = process_iter.NextProcessEntry()) {
Process process;
process.pid = process_entry->pid();
process.parent = process_entry->parent_pid();
map.insert(std::make_pair(process.pid, process));
}
return map;
}
// For each of a list of pids, collect memory information about that process.
ProcessData GetProcessDataMemoryInformation(
const std::vector<pid_t>& pids) {
ProcessData process_data;
for (pid_t pid : pids) {
ProcessMemoryInformation pmi;
pmi.pid = pid;
pmi.num_processes = 1;
if (pmi.pid == base::GetCurrentProcId())
pmi.process_type = content::PROCESS_TYPE_BROWSER;
else
pmi.process_type = content::PROCESS_TYPE_UNKNOWN;
std::unique_ptr<base::ProcessMetrics> metrics(
base::ProcessMetrics::CreateProcessMetrics(pid));
pmi.num_open_fds = metrics->GetOpenFdCount();
pmi.open_fds_soft_limit = metrics->GetOpenFdSoftLimit();
process_data.processes.push_back(pmi);
}
return process_data;
}
// Find all children of the given process with pid |root|.
std::vector<pid_t> GetAllChildren(const ProcessMap& processes, pid_t root) {
std::vector<pid_t> children;
children.push_back(root);
std::set<pid_t> wavefront, next_wavefront;
wavefront.insert(root);
while (wavefront.size()) {
for (const auto& entry : processes) {
const Process& process = entry.second;
if (wavefront.count(process.parent)) {
children.push_back(process.pid);
next_wavefront.insert(process.pid);
}
}
wavefront.clear();
wavefront.swap(next_wavefront);
}
return children;
}
} // namespace
MemoryDetails::MemoryDetails() = default;
ProcessData* MemoryDetails::ChromeBrowser() {
return &process_data_[0];
}
void MemoryDetails::CollectProcessData(
const std::vector<ProcessMemoryInformation>& child_info) {
base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
base::BlockingType::MAY_BLOCK);
ProcessMap process_map = GetProcesses();
std::set<pid_t> browsers_found;
ProcessData current_browser =
GetProcessDataMemoryInformation(GetAllChildren(process_map, getpid()));
current_browser.name = l10n_util::GetStringUTF16(IDS_SHORT_PRODUCT_NAME);
current_browser.process_name = u"chrome";
for (auto i = current_browser.processes.begin();
i != current_browser.processes.end(); ++i) {
// Check if this is one of the child processes whose data we collected
// on the IO thread, and if so copy over that data.
for (size_t child = 0; child < child_info.size(); child++) {
if (child_info[child].pid != i->pid)
continue;
i->titles = child_info[child].titles;
i->process_type = child_info[child].process_type;
break;
}
}
process_data_.push_back(current_browser);
#if BUILDFLAG(IS_CHROMEOS)
base::GetSwapInfo(&swap_info_);
#endif
// Finally return to the browser thread.
content::GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&MemoryDetails::CollectChildInfoOnUIThread, this));
}
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