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https://github.com/SerenityOS/serenity
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5dd3b91f0e
This will be needed to collect statistics from processes that do not have anything to do with LibWebView. The ProcessInfo structure must be virtual to allow callers to add application-specific information.
56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
/*
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* Copyright (c) 2024, Andrew Kaster <akaster@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Platform.h>
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#if !defined(AK_OS_SERENITY)
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# error "This file is for Serenity OS only"
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#endif
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#include <LibCore/File.h>
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#include <LibCore/Platform/ProcessStatistics.h>
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#include <LibCore/ProcessStatisticsReader.h>
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namespace Core::Platform {
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ErrorOr<void> update_process_statistics(ProcessStatistics& statistics)
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{
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static auto proc_all_file = TRY(Core::File::open("/sys/kernel/processes"sv, Core::File::OpenMode::Read));
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auto const all_processes = TRY(Core::ProcessStatisticsReader::get_all(*proc_all_file, false));
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auto const total_time_scheduled = all_processes.total_time_scheduled;
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auto const total_time_scheduled_diff = total_time_scheduled - statistics.total_time_scheduled;
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statistics.total_time_scheduled = total_time_scheduled;
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for (auto& process : statistics.processes) {
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auto it = all_processes.processes.find_if([&](auto& entry) { return entry.pid == process->pid; });
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if (!it.is_end()) {
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process->memory_usage_bytes = it->amount_resident;
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u64 time_process = 0;
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for (auto& thread : it->threads) {
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time_process += thread.time_user + thread.time_kernel;
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}
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u64 time_scheduled_diff = time_process - process->time_spent_in_process;
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process->time_spent_in_process = time_process;
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process->cpu_percent = 0.0;
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if (total_time_scheduled_diff > 0) {
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process->cpu_percent = static_cast<float>((time_scheduled_diff * 1000) / total_time_scheduled_diff) / 10.0f;
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}
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} else {
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process->memory_usage_bytes = 0;
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process->cpu_percent = 0.0;
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process->time_spent_in_process = 0;
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}
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}
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return {};
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}
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}
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