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UserspaceEmulator: Add a page-address-to-MMU-region lookup map

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To make SoftMMU::find_region() O(1), this patch invests 3MiB into a
lookup table where we track each possible page base address and map
them to the SoftMMU::Region corresponding to that address.

This is another large improvement to general emulation performance. :^)
This commit is contained in:
Andreas Kling 2020-11-15 17:30:32 +01:00
parent a4a389156d
commit 59b4874443
2 changed files with 16 additions and 5 deletions
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2
DevTools/UserspaceEmulator/SoftMMU.h
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@ -125,6 +125,8 @@ public:
}
private:
Region* m_page_to_region_map[786432];
OwnPtr<Region> m_tls_region;
NonnullOwnPtrVector<Region> m_regions;
HashMap<int, Region*> m_shbuf_regions;