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aee9317d86
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.
42 lines
1.1 KiB
C++
42 lines
1.1 KiB
C++
#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/VM/PhysicalPage.h>
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#include <Kernel/kmalloc.h>
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Retained<PhysicalPage> PhysicalPage::create_eternal(PhysicalAddress paddr, bool supervisor)
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{
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void* slot = kmalloc_eternal(sizeof(PhysicalPage));
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new (slot) PhysicalPage(paddr, supervisor);
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return adopt(*(PhysicalPage*)slot);
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}
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Retained<PhysicalPage> PhysicalPage::create(PhysicalAddress paddr, bool supervisor)
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{
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void* slot = kmalloc(sizeof(PhysicalPage));
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new (slot) PhysicalPage(paddr, supervisor, false);
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return adopt(*(PhysicalPage*)slot);
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}
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PhysicalPage::PhysicalPage(PhysicalAddress paddr, bool supervisor, bool may_return_to_freelist)
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: m_may_return_to_freelist(may_return_to_freelist)
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, m_supervisor(supervisor)
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, m_paddr(paddr)
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{
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}
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void PhysicalPage::return_to_freelist()
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{
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ASSERT((paddr().get() & ~PAGE_MASK) == 0);
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InterruptDisabler disabler;
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m_retain_count = 1;
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if (m_supervisor)
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MM.deallocate_supervisor_physical_page(*this);
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else
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MM.deallocate_user_physical_page(*this);
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#ifdef MM_DEBUG
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dbgprintf("MM: P%x released to freelist\n", m_paddr.get());
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#endif
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}
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