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Core: Don't create page table mappings before R/C bits are set

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This gets rid of the hack of setting the R and C bits pessimistically,
reversing the performance regression in Rogue Squadron 3.
This commit is contained in:
JosJuice
2026-02-04 21:35:22 +01:00
parent 9462e9d890
commit 0ce95299f6
9 changed files with 197 additions and 76 deletions
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Source/Core/Common/MemArenaAndroid.cpp
+18 -2
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@@ -123,9 +123,13 @@ void MemArena::ReleaseMemoryRegion()
}
}
void* MemArena::MapInMemoryRegion(s64 offset, size_t size, void* base)
void* MemArena::MapInMemoryRegion(s64 offset, size_t size, void* base, bool writeable)
{
void* retval = mmap(base, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, m_shm_fd, offset);
int prot = PROT_READ;
if (writeable)
prot |= PROT_WRITE;
void* retval = mmap(base, size, prot, MAP_SHARED | MAP_FIXED, m_shm_fd, offset);
if (retval == MAP_FAILED)
{
NOTICE_LOG_FMT(MEMMAP, "mmap failed");
@@ -137,6 +141,18 @@ void* MemArena::MapInMemoryRegion(s64 offset, size_t size, void* base)
}
}
bool MemArena::ChangeMappingProtection(void* view, size_t size, bool writeable)
{
int prot = PROT_READ;
if (writeable)
prot |= PROT_WRITE;
int retval = mprotect(view, size, prot);
if (retval != 0)
NOTICE_LOG_FMT(MEMMAP, "mprotect failed");
return retval == 0;
}
void MemArena::UnmapFromMemoryRegion(void* view, size_t size)
{
void* retval = mmap(view, size, PROT_NONE, MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);