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Kernel: Refactor MemoryManager to use a Bitmap rather than a Vector

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This significantly reduces the pressure on the kernel heap when
allocating a lot of pages.

Previously at about 250MB allocated, the free page list would outgrow
the kernel's heap. Given that there is no longer a page list, this does
not happen.

The next barrier will be the kernel memory used by the page records for
in-use memory. This kicks in at about 1GB.
This commit is contained in:
Conrad Pankoff 2019-06-11 21:13:02 +10:00 • committed by Andreas Kling
parent 1a77dfed23
commit aee9317d86
8 changed files with 278 additions and 51 deletions
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2
Kernel/VM/Region.cpp
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@ -103,7 +103,7 @@ int Region::commit()
for (size_t i = first_page_index(); i <= last_page_index(); ++i) {
if (!vmo().physical_pages()[i].is_null())
continue;
auto physical_page = MM.allocate_physical_page(MemoryManager::ShouldZeroFill::Yes);
auto physical_page = MM.allocate_user_physical_page(MemoryManager::ShouldZeroFill::Yes);
if (!physical_page) {
kprintf("MM: commit was unable to allocate a physical page\n");
return -ENOMEM;