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Kernel: Add a mode flag to sys$purge and allow purging clean inodes

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This commit is contained in:
Andreas Kling 2019-12-29 13:16:53 +01:00
parent c74cde918a
commit 1f31156173
7 changed files with 83 additions and 17 deletions
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25
Kernel/VM/InodeVMObject.cpp
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@ -39,7 +39,8 @@ InodeVMObject::~InodeVMObject()
size_t InodeVMObject::amount_clean() const
{
size_t count = 0;
for (int i = 0; i < m_dirty_pages.size(); ++i) {
ASSERT(page_count() == (size_t)m_dirty_pages.size());
for (size_t i = 0; i < page_count(); ++i) {
if (!m_dirty_pages.get(i) && m_physical_pages[i])
++count;
}
@ -125,3 +126,25 @@ void InodeVMObject::inode_contents_changed(Badge<Inode>, off_t offset, ssize_t s
region.remap();
});
}
int InodeVMObject::release_all_clean_pages()
{
LOCKER(m_paging_lock);
return release_all_clean_pages_impl();
}
int InodeVMObject::release_all_clean_pages_impl()
{
int count = 0;
InterruptDisabler disabler;
for (size_t i = 0; i < page_count(); ++i) {
if (!m_dirty_pages.get(i) && m_physical_pages[i]) {
m_physical_pages[i] = nullptr;
++count;
}
}
for_each_region([](auto& region) {
region.remap();
});
return count;
}

4
Kernel/VM/InodeVMObject.h
View file

@ -19,6 +19,8 @@ public:
size_t amount_dirty() const;
size_t amount_clean() const;
int release_all_clean_pages();
private:
explicit InodeVMObject(Inode&);
explicit InodeVMObject(const InodeVMObject&);
@ -29,6 +31,8 @@ private:
virtual bool is_inode() const override { return true; }
int release_all_clean_pages_impl();
NonnullRefPtr<Inode> m_inode;
Bitmap m_dirty_pages;
};

4
Kernel/VM/Region.cpp
View file

@ -410,6 +410,10 @@ PageFaultResponse Region::handle_inode_fault(size_t page_index_in_region)
LOCKER(vmobject().m_paging_lock);
cli();
#ifdef PAGE_FAULT_DEBUG
dbg() << *current << " inode fault in " << name() << " page index: " << page_index_in_region;
#endif
if (!vmobject_physical_page_entry.is_null()) {
#ifdef PAGE_FAULT_DEBUG
dbgprintf("MM: page_in_from_inode() but page already present. Fine with me!\n");