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#include "MemoryStatsWidget.h"
#include <LibGUI/GPainter.h>
#include <LibGUI/GBoxLayout.h>
#include <LibGUI/GLabel.h>
#include <SharedGraphics/StylePainter.h>
#include <stdio.h>
#include <stdlib.h>
MemoryStatsWidget::MemoryStatsWidget(GWidget* parent)
: GWidget(parent)
{
set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
set_preferred_size({ 0, 60 });
set_layout(make<GBoxLayout>(Orientation::Vertical));
layout()->set_margins({ 0, 8, 0, 0 });
layout()->set_spacing(3);
auto build_widgets_for_label = [this] (const String& description) -> GLabel* {
auto* container = new GWidget(this);
container->set_layout(make<GBoxLayout>(Orientation::Horizontal));
container->set_size_policy(SizePolicy::Fixed, SizePolicy::Fixed);
container->set_preferred_size({ 250, 12 });
auto* description_label = new GLabel(description, container);
description_label->set_font(Font::default_bold_font());
description_label->set_text_alignment(TextAlignment::CenterLeft);
auto* label = new GLabel(container);
label->set_text_alignment(TextAlignment::CenterRight);
return label;
};
m_user_physical_pages_label = build_widgets_for_label("Userspace physical:");
m_supervisor_physical_pages_label = build_widgets_for_label("Supervisor physical:");
m_kmalloc_label = build_widgets_for_label("Kernel heap:");
start_timer(1000);
refresh();
}
MemoryStatsWidget::~MemoryStatsWidget()
{
}
static inline size_t page_count_to_kb(size_t kb)
{
return (kb * 4096) / 1024;
}
static inline size_t bytes_to_kb(size_t bytes)
{
return bytes / 1024;
}
void MemoryStatsWidget::refresh()
{
FILE* fp = fopen("/proc/memstat", "r");
if (!fp) {
perror("failed to open /proc/memstat");
exit(1);
}
for (;;) {
char buf[BUFSIZ];
char* ptr = fgets(buf, sizeof(buf), fp);
if (!ptr)
break;
auto parts = String(buf, Chomp).split(',');
if (parts.size() < 7)
break;
bool ok;
unsigned kmalloc_sum_eternal = parts[0].to_uint(ok);
ASSERT(ok);
(void)kmalloc_sum_eternal;
unsigned kmalloc_sum_alloc = parts[1].to_uint(ok);
ASSERT(ok);
unsigned kmalloc_sum_free = parts[2].to_uint(ok);
ASSERT(ok);
unsigned user_pages_alloc = parts[3].to_uint(ok);
ASSERT(ok);
unsigned user_pages_free = parts[4].to_uint(ok);
ASSERT(ok);
unsigned supervisor_pages_alloc = parts[5].to_uint(ok);
ASSERT(ok);
unsigned supervisor_pages_free = parts[6].to_uint(ok);
ASSERT(ok);
size_t kmalloc_sum_available = kmalloc_sum_alloc + kmalloc_sum_free;
size_t user_pages_available = user_pages_alloc + user_pages_free;
size_t supervisor_pages_available = supervisor_pages_alloc + supervisor_pages_free;
m_kmalloc_label->set_text(String::format("%uK/%uK\n", bytes_to_kb(kmalloc_sum_alloc), bytes_to_kb(kmalloc_sum_available)));
m_user_physical_pages_label->set_text(String::format("%uK/%uK\n", page_count_to_kb(user_pages_alloc), page_count_to_kb(user_pages_available)));
m_supervisor_physical_pages_label->set_text(String::format("%uK/%uK\n", page_count_to_kb(supervisor_pages_alloc), page_count_to_kb(supervisor_pages_available)));
break;
}
fclose(fp);
}
void MemoryStatsWidget::timer_event(GTimerEvent&)
{
refresh();
}
void MemoryStatsWidget::paint_event(GPaintEvent& event)
{
GPainter painter(*this);
painter.set_clip_rect(event.rect());
StylePainter::the().paint_surface(painter, rect());
}
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