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Kernel+SystemMonitor: Expose the number of set CoW bits in each Region

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This number tells us how many more pages in a given region will trigger
a CoW fault if written to.
This commit is contained in:
Andreas Kling 2019-12-15 16:53:00 +01:00
parent 9ad151c665
commit 3fbc50a350
Notes: sideshowbarker 2024-07-19 10:51:17 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/3fbc50a3507
4 changed files with 14 additions and 0 deletions
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1
Applications/SystemMonitor/ProcessMemoryMapWidget.cpp
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@ -37,6 +37,7 @@ ProcessMemoryMapWidget::ProcessMemoryMapWidget(GWidget* parent)
return "Volatile";
return "Non-volatile";
});
pid_vm_fields.empend("cow_pages", "# CoW", TextAlignment::CenterRight);
pid_vm_fields.empend("name", "Name", TextAlignment::CenterLeft);
m_json_model = GJsonArrayModel::create({}, move(pid_vm_fields));
m_table_view->set_model(GSortingProxyModel::create(*m_json_model));

1
Kernel/FileSystem/ProcFS.cpp
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@ -273,6 +273,7 @@ Optional<KBuffer> procfs$pid_vm(InodeIdentifier identifier)
region_object.add("address", region.vaddr().get());
region_object.add("size", (u32)region.size());
region_object.add("amount_resident", (u32)region.amount_resident());
region_object.add("cow_pages", region.cow_pages());
region_object.add("name", region.name());
}
array.finish();

10
Kernel/VM/Region.cpp
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@ -113,6 +113,16 @@ int Region::commit()
return 0;
}
u32 Region::cow_pages() const
{
if (!m_cow_map)
return 0;
u32 count = 0;
for (int i = 0; i < m_cow_map->size(); ++i)
count += m_cow_map->get(i);
return count;
}
size_t Region::amount_resident() const
{
size_t bytes = 0;

2
Kernel/VM/Region.h
View File

@ -105,6 +105,8 @@ public:
bool should_cow(size_t page_index) const;
void set_should_cow(size_t page_index, bool);
u32 cow_pages() const;
void set_writable(bool b)
{
if (b)