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Kernel: Allow release of a specific amount of of clean pages

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Previously, we could only release *all* clean pages.
This patch makes it possible to release a specific amount of clean
pages. If the attempted number of pages to release is more than the
amount of clean pages, all clean pages will be released.
This commit is contained in:
dylanbobb
2022-08-14 23:05:42 -04:00
committed by Andreas Kling
parent 072dde9387
commit 09d0fae2c6
2 changed files with 20 additions and 0 deletions
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19
Kernel/Memory/InodeVMObject.cpp
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@@ -67,6 +67,25 @@ int InodeVMObject::release_all_clean_pages()
return count;
}
int InodeVMObject::try_release_clean_pages(int page_amount)
{
SpinlockLocker locker(m_lock);
int count = 0;
for (size_t i = 0; i < page_count() && count < page_amount; ++i) {
if (!m_dirty_pages.get(i) && m_physical_pages[i]) {
m_physical_pages[i] = nullptr;
++count;
}
}
if (count) {
for_each_region([](auto& region) {
region.remap();
});
}
return count;
}
u32 InodeVMObject::writable_mappings() const
{
u32 count = 0;