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Kernel: Avoid O(n) loop over zones when allocating from PhysicalRegion

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We now keep all the PhysicalZones on one of two intrusive lists within
the PhysicalRegion.

The "usable" list contains all zones that can be allocated from,
and the "full" list contains all zones with no free pages.
This commit is contained in:
Andreas Kling 2021-07-13 19:52:42 +02:00
parent 9ae067aa7f
commit 379bcd26e4
3 changed files with 38 additions and 10 deletions
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8
Kernel/VM/PhysicalZone.h
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@ -8,6 +8,7 @@
#include <AK/Bitmap.h>
#include <AK/Forward.h>
#include <AK/IntrusiveList.h>
#include <AK/Types.h>
#include <Kernel/Forward.h>
@ -32,6 +33,8 @@ public:
void dump() const;
size_t available() const { return m_page_count - (m_used_chunks / 2); }
bool is_empty() const { return !available(); }
PhysicalAddress base() const { return m_base_address; }
bool contains(PhysicalAddress paddr) const
{
@ -82,6 +85,11 @@ private:
PhysicalAddress m_base_address { 0 };
size_t m_page_count { 0 };
size_t m_used_chunks { 0 };
IntrusiveListNode<PhysicalZone> m_list_node;
public:
using List = IntrusiveList<PhysicalZone, RawPtr<PhysicalZone>, &PhysicalZone::m_list_node>;
};
}