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ReactOS Portable Systems Group
2c293c30c4
- First, switch to using system PTEs as it should've been from the beginning. Our original implementation was broken and prone to race conditions, which Dmitry graciously fixed.
- We can now remove the MiZeroPageInternal hack that was used as a way to avoid deadlock/contention in the zero paths.
- Zeroing PTEs is done at DPC level in ReactOS, to avoid ReactOS-specific race issues. In Windows NT, this operation is always done at passive.
- Zeroing PTEs are similar to hyperspace PTEs, but they can be mapped in chunks for optimization.
- ReactOS does not currently make use of this functionality, so zeroing is pretty slow, especially on bootup if you have lots of memory (all RAM is zeroed).
- The existing ReactOS "compatibility layer" for hyperspace was augmented to seamlessly use the new zeroing PTE API.
- You must now unmap zeroing PTEs -- MiZeroPage was modified to do this.
- System PTE binning, NBQUEUES and SLISTS would optimize this further. TBD.
- Once again, tested on the trinity of supported emulators.
svn path=/trunk/; revision=41578