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SystemMonitor: Add pagemap visualization for VM regions

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This patch adds a new column to the per-process memory regions view in
SystemMonitor. It's a scaled view of the underlying pagemap of a region
that tells you which chunks of the region are resident/null/zero.
This commit is contained in:
Andreas Kling 2020-02-25 21:38:45 +01:00
parent 7f9a86b495
commit 4f99c3726c
Notes: sideshowbarker 2024-07-19 09:03:39 +09:00
1 changed files with 48 additions and 0 deletions
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48
Applications/SystemMonitor/ProcessMemoryMapWidget.cpp
View file

@ -28,8 +28,41 @@
#include <LibCore/Timer.h>
#include <LibGUI/BoxLayout.h>
#include <LibGUI/JsonArrayModel.h>
#include <LibGUI/Painter.h>
#include <LibGUI/SortingProxyModel.h>
#include <LibGUI/TableView.h>
#include <LibGfx/Palette.h>
class PagemapPaintingDelegate final : public GUI::TableCellPaintingDelegate {
public:
virtual ~PagemapPaintingDelegate() override {}
virtual void paint(GUI::Painter& painter, const Gfx::Rect& a_rect, const Gfx::Palette&, const GUI::Model& model, const GUI::ModelIndex& index) override
{
auto rect = a_rect.shrunken(2, 2);
auto pagemap = model.data(index, GUI::Model::Role::Custom).to_string();
float scale_factor = (float)pagemap.length() / (float)rect.width();
for (int i = 0; i < rect.width(); ++i) {
int x = rect.x() + i;
char c = pagemap[(float)i * scale_factor];
Color color;
if (c == 'N') // Null (no page at all, typically an inode-backed page that hasn't been paged in.)
color = Color::White;
else if (c == 'Z') // Zero (globally shared zero page, typically an untouched anonymous page.)
color = Color::from_rgb(0xc0c0ff);
else if (c == 'P') // Physical (a resident page)
color = Color::Black;
else
ASSERT_NOT_REACHED();
painter.draw_line({ x, rect.top() }, { x, rect.bottom() }, color);
}
painter.draw_rect(rect, Color::Black);
}
};
ProcessMemoryMapWidget::ProcessMemoryMapWidget()
{
@ -67,10 +100,25 @@ ProcessMemoryMapWidget::ProcessMemoryMapWidget()
return "Volatile";
return "Non-volatile";
});
pid_vm_fields.empend(
"Page map", Gfx::TextAlignment::CenterLeft,
[](auto&) {
return GUI::Variant();
},
[](auto&) {
return GUI::Variant();
},
[](const JsonObject& object) {
auto pagemap = object.get("pagemap").as_string_or({});
return pagemap;
});
pid_vm_fields.empend("cow_pages", "# CoW", Gfx::TextAlignment::CenterRight);
pid_vm_fields.empend("name", "Name", Gfx::TextAlignment::CenterLeft);
m_json_model = GUI::JsonArrayModel::create({}, move(pid_vm_fields));
m_table_view->set_model(GUI::SortingProxyModel::create(*m_json_model));
m_table_view->set_cell_painting_delegate(6, make<PagemapPaintingDelegate>());
m_table_view->model()->set_key_column_and_sort_order(0, GUI::SortOrder::Ascending);
m_timer = add<Core::Timer>(1000, [this] { refresh(); });
}