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Kernel: Make KBuffer lazily populated

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KBuffers are now zero-filled on demand instead of up front. This means
that you can create a huge KBuffer and it will only take up VM, not
physical pages (until you access them.)
This commit is contained in:
Andreas Kling 2019-08-06 14:12:52 +02:00
parent a0bb592b4f
commit c973a51a23
Notes: sideshowbarker 2024-07-19 12:51:09 +09:00
3 changed files with 5 additions and 4 deletions
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5
Kernel/VM/MemoryManager.cpp
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@ -461,7 +461,7 @@ PageFaultResponse MemoryManager::handle_page_fault(const PageFault& fault)
return PageFaultResponse::ShouldCrash;
}
RefPtr<Region> MemoryManager::allocate_kernel_region(size_t size, const StringView& name, bool user_accessible)
RefPtr<Region> MemoryManager::allocate_kernel_region(size_t size, const StringView& name, bool user_accessible, bool should_commit)
{
InterruptDisabler disabler;
ASSERT(!(size % PAGE_SIZE));
@ -474,7 +474,8 @@ RefPtr<Region> MemoryManager::allocate_kernel_region(size_t size, const StringVi
region = Region::create_kernel_only(range, name, PROT_READ | PROT_WRITE | PROT_EXEC, false);
MM.map_region_at_address(*m_kernel_page_directory, *region, range.base());
// FIXME: It would be cool if these could zero-fill on demand instead.
region->commit();
if (should_commit)
region->commit();
return region;
}