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f249c40aaa
It was confusing to see multiple calls to set_foo() in a row. Since this is an intersecting operation, let's call it add_clip_rect() instead.
110 lines
3.6 KiB
C++
110 lines
3.6 KiB
C++
#include "MemoryStatsWidget.h"
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#include <LibGUI/GPainter.h>
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#include <LibGUI/GBoxLayout.h>
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#include <LibGUI/GLabel.h>
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#include <SharedGraphics/StylePainter.h>
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#include <stdio.h>
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#include <stdlib.h>
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MemoryStatsWidget::MemoryStatsWidget(GWidget* parent)
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: GWidget(parent)
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{
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set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
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set_preferred_size({ 0, 60 });
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set_layout(make<GBoxLayout>(Orientation::Vertical));
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layout()->set_margins({ 0, 8, 0, 0 });
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layout()->set_spacing(3);
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auto build_widgets_for_label = [this] (const String& description) -> GLabel* {
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auto* container = new GWidget(this);
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container->set_layout(make<GBoxLayout>(Orientation::Horizontal));
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container->set_size_policy(SizePolicy::Fixed, SizePolicy::Fixed);
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container->set_preferred_size({ 250, 12 });
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auto* description_label = new GLabel(description, container);
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description_label->set_font(Font::default_bold_font());
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description_label->set_text_alignment(TextAlignment::CenterLeft);
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auto* label = new GLabel(container);
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label->set_text_alignment(TextAlignment::CenterRight);
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return label;
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};
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m_user_physical_pages_label = build_widgets_for_label("Userspace physical:");
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m_supervisor_physical_pages_label = build_widgets_for_label("Supervisor physical:");
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m_kmalloc_label = build_widgets_for_label("Kernel heap:");
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start_timer(1000);
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refresh();
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}
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MemoryStatsWidget::~MemoryStatsWidget()
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{
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}
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static inline size_t page_count_to_kb(size_t kb)
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{
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return (kb * 4096) / 1024;
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}
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static inline size_t bytes_to_kb(size_t bytes)
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{
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return bytes / 1024;
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}
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void MemoryStatsWidget::refresh()
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{
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FILE* fp = fopen("/proc/memstat", "r");
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if (!fp) {
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perror("failed to open /proc/memstat");
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exit(1);
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}
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for (;;) {
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char buf[BUFSIZ];
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char* ptr = fgets(buf, sizeof(buf), fp);
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if (!ptr)
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break;
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auto parts = String(buf, Chomp).split(',');
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if (parts.size() < 7)
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break;
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bool ok;
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unsigned kmalloc_sum_eternal = parts[0].to_uint(ok);
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ASSERT(ok);
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(void)kmalloc_sum_eternal;
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unsigned kmalloc_sum_alloc = parts[1].to_uint(ok);
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ASSERT(ok);
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unsigned kmalloc_sum_free = parts[2].to_uint(ok);
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ASSERT(ok);
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unsigned user_pages_alloc = parts[3].to_uint(ok);
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ASSERT(ok);
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unsigned user_pages_free = parts[4].to_uint(ok);
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ASSERT(ok);
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unsigned supervisor_pages_alloc = parts[5].to_uint(ok);
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ASSERT(ok);
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unsigned supervisor_pages_free = parts[6].to_uint(ok);
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ASSERT(ok);
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size_t kmalloc_sum_available = kmalloc_sum_alloc + kmalloc_sum_free;
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size_t user_pages_available = user_pages_alloc + user_pages_free;
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size_t supervisor_pages_available = supervisor_pages_alloc + supervisor_pages_free;
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m_kmalloc_label->set_text(String::format("%uK/%uK\n", bytes_to_kb(kmalloc_sum_alloc), bytes_to_kb(kmalloc_sum_available)));
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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)));
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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)));
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break;
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}
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fclose(fp);
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}
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void MemoryStatsWidget::timer_event(GTimerEvent&)
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{
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refresh();
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}
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void MemoryStatsWidget::paint_event(GPaintEvent& event)
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{
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GPainter painter(*this);
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painter.add_clip_rect(event.rect());
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StylePainter::the().paint_surface(painter, rect());
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}
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