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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/CircularQueue.h>
#include <AK/JsonObject.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibCore/System.h>
#include <LibGUI/Application.h>
#include <LibGUI/Frame.h>
#include <LibGUI/Painter.h>
#include <LibGUI/Window.h>
#include <LibGfx/Palette.h>
#include <LibMain/Main.h>
#include <serenity.h>
#include <spawn.h>
#include <stdio.h>
enum class GraphType {
CPU,
Memory,
};
class GraphWidget final : public GUI::Frame {
C_OBJECT(GraphWidget);
public:
static constexpr size_t history_size = 24;
private:
GraphWidget(GraphType graph_type, Optional<Gfx::Color> graph_color, Optional<Gfx::Color> graph_error_color)
: m_graph_type(graph_type)
{
set_frame_thickness(1);
m_graph_color = graph_color.value_or(palette().menu_selection());
m_graph_error_color = graph_error_color.value_or(Color::Red);
start_timer(1000);
}
virtual void timer_event(Core::TimerEvent&) override
{
switch (m_graph_type) {
case GraphType::CPU: {
u64 total, idle;
if (get_cpu_usage(total, idle)) {
auto total_diff = total - m_last_total;
m_last_total = total;
auto idle_diff = idle - m_last_idle;
m_last_idle = idle;
float cpu = total_diff > 0 ? (float)(total_diff - idle_diff) / (float)total_diff : 0;
m_history.enqueue(cpu);
m_tooltip = String::formatted("CPU usage: {:.1}%", 100 * cpu);
} else {
m_history.enqueue(-1);
m_tooltip = StringView("Unable to determine CPU usage");
}
break;
}
case GraphType::Memory: {
u64 allocated, available;
if (get_memory_usage(allocated, available)) {
double total_memory = allocated + available;
double memory = (double)allocated / total_memory;
m_history.enqueue(memory);
m_tooltip = String::formatted("Memory: {} MiB of {:.1} MiB in use", allocated / MiB, total_memory / MiB);
} else {
m_history.enqueue(-1);
m_tooltip = StringView("Unable to determine memory usage");
}
break;
}
default:
VERIFY_NOT_REACHED();
}
set_tooltip(m_tooltip);
update();
}
virtual void paint_event(GUI::PaintEvent& event) override
{
GUI::Frame::paint_event(event);
GUI::Painter painter(*this);
painter.add_clip_rect(event.rect());
painter.add_clip_rect(frame_inner_rect());
painter.fill_rect(event.rect(), Color::Black);
int i = m_history.capacity() - m_history.size();
auto rect = frame_inner_rect();
for (auto value : m_history) {
if (value >= 0) {
painter.draw_line(
{ rect.x() + i, rect.bottom() },
{ rect.x() + i, rect.top() + (int)(roundf(rect.height() - (value * rect.height()))) },
m_graph_color);
} else {
painter.draw_line(
{ rect.x() + i, rect.top() },
{ rect.x() + i, rect.bottom() },
m_graph_error_color);
}
++i;
}
}
virtual void mousedown_event(GUI::MouseEvent& event) override
{
if (event.button() != GUI::MouseButton::Primary)
return;
pid_t child_pid;
const char* argv[] = { "SystemMonitor", "-t", "graphs", nullptr };
if ((errno = posix_spawn(&child_pid, "/bin/SystemMonitor", nullptr, nullptr, const_cast<char**>(argv), environ))) {
perror("posix_spawn");
} else {
if (disown(child_pid) < 0)
perror("disown");
}
}
bool get_cpu_usage(u64& total, u64& idle)
{
total = 0;
idle = 0;
if (m_proc_stat) {
// Seeking to the beginning causes a data refresh!
if (!m_proc_stat->seek(0, Core::SeekMode::SetPosition))
return false;
} else {
auto proc_stat = Core::File::construct("/proc/stat");
if (!proc_stat->open(Core::OpenMode::ReadOnly))
return false;
m_proc_stat = move(proc_stat);
}
auto file_contents = m_proc_stat->read_all();
auto json_or_error = JsonValue::from_string(file_contents);
if (json_or_error.is_error())
return false;
auto json = json_or_error.release_value();
auto const& obj = json.as_object();
total = obj.get("total_time").to_u64();
idle = obj.get("idle_time").to_u64();
return true;
}
bool get_memory_usage(u64& allocated, u64& available)
{
if (m_proc_mem) {
// Seeking to the beginning causes a data refresh!
if (!m_proc_mem->seek(0, Core::SeekMode::SetPosition))
return false;
} else {
auto proc_memstat = Core::File::construct("/proc/memstat");
if (!proc_memstat->open(Core::OpenMode::ReadOnly))
return false;
m_proc_mem = move(proc_memstat);
}
auto file_contents = m_proc_mem->read_all();
auto json_or_error = JsonValue::from_string(file_contents);
if (json_or_error.is_error())
return false;
auto json = json_or_error.release_value();
auto const& obj = json.as_object();
unsigned kmalloc_allocated = obj.get("kmalloc_allocated").to_u32();
unsigned kmalloc_available = obj.get("kmalloc_available").to_u32();
auto user_physical_allocated = obj.get("user_physical_allocated").to_u64();
auto user_physical_committed = obj.get("user_physical_committed").to_u64();
auto user_physical_uncommitted = obj.get("user_physical_uncommitted").to_u64();
unsigned kmalloc_bytes_total = kmalloc_allocated + kmalloc_available;
unsigned kmalloc_pages_total = (kmalloc_bytes_total + PAGE_SIZE - 1) / PAGE_SIZE;
u64 total_userphysical_and_swappable_pages = kmalloc_pages_total + user_physical_allocated + user_physical_committed + user_physical_uncommitted;
allocated = kmalloc_allocated + ((user_physical_allocated + user_physical_committed) * PAGE_SIZE);
available = (total_userphysical_and_swappable_pages * PAGE_SIZE) - allocated;
return true;
}
GraphType m_graph_type;
Gfx::Color m_graph_color;
Gfx::Color m_graph_error_color;
CircularQueue<float, history_size> m_history;
u64 m_last_idle { 0 };
u64 m_last_total { 0 };
String m_tooltip;
RefPtr<Core::File> m_proc_stat;
RefPtr<Core::File> m_proc_mem;
};
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio recvfd sendfd proc exec rpath unix"));
auto app = GUI::Application::construct(arguments);
TRY(Core::System::pledge("stdio recvfd sendfd proc exec rpath"));
const char* cpu = nullptr;
const char* memory = nullptr;
Core::ArgsParser args_parser;
args_parser.add_option(cpu, "Create CPU graph", "cpu", 'C', "cpu");
args_parser.add_option(memory, "Create memory graph", "memory", 'M', "memory");
args_parser.parse(arguments);
if (!cpu && !memory) {
printf("At least one of --cpu or --memory must be used");
return 1;
}
NonnullRefPtrVector<GUI::Window> applet_windows;
auto create_applet = [&](GraphType graph_type, StringView spec) -> ErrorOr<void> {
auto parts = spec.split_view(',');
dbgln("Create applet: {} with spec '{}'", (int)graph_type, spec);
if (parts.size() != 2)
return Error::from_string_literal("ResourceGraph: Applet spec is not composed of exactly 2 comma-separated parts"sv);
auto name = parts[0];
auto graph_color = Gfx::Color::from_string(parts[1]);
auto window = GUI::Window::construct();
window->set_title(name);
window->set_window_type(GUI::WindowType::Applet);
window->resize(GraphWidget::history_size + 2, 15);
auto graph_widget = TRY(window->try_set_main_widget<GraphWidget>(graph_type, graph_color, Optional<Gfx::Color> {}));
window->show();
applet_windows.append(move(window));
return {};
};
if (cpu)
TRY(create_applet(GraphType::CPU, cpu));
if (memory)
TRY(create_applet(GraphType::Memory, memory));
TRY(Core::System::unveil("/res", "r"));
TRY(Core::System::unveil("/proc/stat", "r"));
TRY(Core::System::unveil("/proc/memstat", "r"));
TRY(Core::System::unveil("/bin/SystemMonitor", "x"));
TRY(Core::System::unveil(nullptr, nullptr));
return app->exec();
}
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