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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "MemoryStatsWidget.h"
#include "GraphWidget.h"
#include <AK/JsonObject.h>
#include <AK/NumberFormat.h>
#include <LibCore/DeprecatedFile.h>
#include <LibCore/Object.h>
#include <LibGUI/BoxLayout.h>
#include <LibGUI/Label.h>
#include <LibGUI/Painter.h>
#include <LibGfx/Font/FontDatabase.h>
#include <LibGfx/StylePainter.h>
REGISTER_WIDGET(SystemMonitor, MemoryStatsWidget)
namespace SystemMonitor {
static MemoryStatsWidget* s_the;
MemoryStatsWidget* MemoryStatsWidget::the()
{
return s_the;
}
MemoryStatsWidget::MemoryStatsWidget()
: MemoryStatsWidget(nullptr)
{
}
MemoryStatsWidget::MemoryStatsWidget(GraphWidget* graph)
: m_graph(graph)
{
VERIFY(!s_the);
s_the = this;
REGISTER_STRING_PROPERTY("memory_graph", graph_widget_name, set_graph_widget_via_name);
set_fixed_height(110);
set_layout<GUI::VerticalBoxLayout>();
layout()->set_margins({ 8, 0, 0 });
layout()->set_spacing(3);
auto build_widgets_for_label = [this](DeprecatedString const& description) -> RefPtr<GUI::Label> {
auto& container = add<GUI::Widget>();
container.set_layout<GUI::HorizontalBoxLayout>();
container.set_fixed_size(275, 12);
auto& description_label = container.add<GUI::Label>(description);
description_label.set_font(Gfx::FontDatabase::default_font().bold_variant());
description_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
auto& label = container.add<GUI::Label>();
label.set_text_alignment(Gfx::TextAlignment::CenterRight);
return label;
};
m_physical_pages_label = build_widgets_for_label("Physical memory:");
m_physical_pages_committed_label = build_widgets_for_label("Committed memory:");
m_kmalloc_space_label = build_widgets_for_label("Kernel heap:");
m_kmalloc_count_label = build_widgets_for_label("Calls kmalloc:");
m_kfree_count_label = build_widgets_for_label("Calls kfree:");
m_kmalloc_difference_label = build_widgets_for_label("Difference:");
refresh();
}
void MemoryStatsWidget::set_graph_widget(GraphWidget& graph)
{
m_graph = &graph;
}
void MemoryStatsWidget::set_graph_widget_via_name(DeprecatedString name)
{
m_graph_widget_name = move(name);
if (!m_graph_widget_name.is_null()) {
// FIXME: We assume here that the graph widget is a sibling or descendant of a sibling. This prevents more complex hierarchies.
auto* maybe_graph = parent_widget()->find_descendant_of_type_named<GraphWidget>(m_graph_widget_name);
if (maybe_graph) {
m_graph = maybe_graph;
// Delete the stored graph name to signal that we found the widget
m_graph_widget_name = {};
} else {
dbgln("MemoryStatsWidget: Couldn't find graph of name '{}', retrying later.", m_graph_widget_name);
}
}
}
DeprecatedString MemoryStatsWidget::graph_widget_name()
{
if (m_graph)
return m_graph->name();
return m_graph_widget_name;
}
static inline u64 page_count_to_bytes(size_t count)
{
return count * 4096;
}
void MemoryStatsWidget::refresh()
{
auto proc_memstat = Core::DeprecatedFile::construct("/sys/kernel/memstat");
if (!proc_memstat->open(Core::OpenMode::ReadOnly))
VERIFY_NOT_REACHED();
auto file_contents = proc_memstat->read_all();
auto json_result = JsonValue::from_string(file_contents).release_value_but_fixme_should_propagate_errors();
auto const& json = json_result.as_object();
u32 kmalloc_allocated = json.get_u32("kmalloc_allocated"sv).value_or(0);
u32 kmalloc_available = json.get_u32("kmalloc_available"sv).value_or(0);
u64 physical_allocated = json.get_u64("physical_allocated"sv).value_or(0);
u64 physical_available = json.get_u64("physical_available"sv).value_or(0);
u64 physical_committed = json.get_u64("physical_committed"sv).value_or(0);
u64 physical_uncommitted = json.get_u64("physical_uncommitted"sv).value_or(0);
u32 kmalloc_call_count = json.get_u32("kmalloc_call_count"sv).value_or(0);
u32 kfree_call_count = json.get_u32("kfree_call_count"sv).value_or(0);
u64 kmalloc_bytes_total = kmalloc_allocated + kmalloc_available;
u64 physical_pages_total = physical_allocated + physical_available;
u64 physical_pages_in_use = physical_allocated;
u64 total_userphysical_and_swappable_pages = physical_allocated + physical_committed + physical_uncommitted;
m_kmalloc_space_label->set_text(DeprecatedString::formatted("{}/{}", human_readable_size(kmalloc_allocated), human_readable_size(kmalloc_bytes_total)));
m_physical_pages_label->set_text(DeprecatedString::formatted("{}/{}", human_readable_size(page_count_to_bytes(physical_pages_in_use)), human_readable_size(page_count_to_bytes(physical_pages_total))));
m_physical_pages_committed_label->set_text(DeprecatedString::formatted("{}", human_readable_size(page_count_to_bytes(physical_committed))));
m_kmalloc_count_label->set_text(DeprecatedString::formatted("{}", kmalloc_call_count));
m_kfree_count_label->set_text(DeprecatedString::formatted("{}", kfree_call_count));
m_kmalloc_difference_label->set_text(DeprecatedString::formatted("{:+}", kmalloc_call_count - kfree_call_count));
// Because the initialization order of us and the graph is unknown, we might get a couple of updates where the graph widget lookup fails.
// Therefore, we can retry indefinitely. (Should not be too much of a performance hit, as we don't update that often.)
if (!m_graph)
set_graph_widget_via_name(move(m_graph_widget_name));
if (m_graph) {
m_graph->set_max(page_count_to_bytes(total_userphysical_and_swappable_pages) + kmalloc_bytes_total);
m_graph->add_value({ page_count_to_bytes(physical_committed), page_count_to_bytes(physical_allocated), kmalloc_bytes_total });
}
}
}
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