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Only COW on fault if the physical page has retain_count > 1.

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This makes COW pages lazily-but-transparently revert back to read/write.
This commit is contained in:
Andreas Kling 2018-11-05 14:10:18 +01:00
parent 2d045d2a64
commit 9e62eb4856
4 changed files with 17 additions and 2 deletions
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2
Kernel/MemoryManager.h
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@ -37,6 +37,8 @@ public:
return_to_freelist();
}
unsigned retain_count() const { return m_retain_count; }
private:
PhysicalPage(PhysicalAddress paddr)
: m_paddr(paddr)