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Merge pull request #11823 from AdmiralCurtiss/mmap-android

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Common/MemArenaAndroid: Keep fastmem region mapped.
This commit is contained in:
Admiral H. Curtiss 2023-05-19 18:42:33 +02:00 committed by GitHub
commit b0d7fa9eb1
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 28 additions and 17 deletions
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10
Source/Core/Common/MemArena.h
View file

@ -113,13 +113,9 @@ private:
void* m_address_VirtualAlloc2 = nullptr;
void* m_address_MapViewOfFile3 = nullptr;
#else
#ifdef ANDROID
int fd;
#else
int m_shm_fd;
void* m_reserved_region;
std::size_t m_reserved_region_size;
#endif
int m_shm_fd = 0;
void* m_reserved_region = nullptr;
std::size_t m_reserved_region_size = 0;
#endif
};

35
Source/Core/Common/MemArenaAndroid.cpp
View file

@ -64,24 +64,33 @@ MemArena::~MemArena() = default;
void MemArena::GrabSHMSegment(size_t size)
{
fd = AshmemCreateFileMapping(("dolphin-emu." + std::to_string(getpid())).c_str(), size);
if (fd < 0)
m_shm_fd = AshmemCreateFileMapping(("dolphin-emu." + std::to_string(getpid())).c_str(), size);
if (m_shm_fd < 0)
NOTICE_LOG_FMT(MEMMAP, "Ashmem allocation failed");
}
void MemArena::ReleaseSHMSegment()
{
close(fd);
close(m_shm_fd);
}
void* MemArena::CreateView(s64 offset, size_t size)
{
return MapInMemoryRegion(offset, size, nullptr);
void* retval = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, m_shm_fd, offset);
if (retval == MAP_FAILED)
{
NOTICE_LOG_FMT(MEMMAP, "mmap failed");
return nullptr;
}
else
{
return retval;
}
}
void MemArena::ReleaseView(void* view, size_t size)
{
UnmapFromMemoryRegion(view, size);
munmap(view, size);
}
u8* MemArena::ReserveMemoryRegion(size_t memory_size)
@ -96,19 +105,23 @@ u8* MemArena::ReserveMemoryRegion(size_t memory_size)
PanicAlertFmt("Failed to map enough memory space: {}", LastStrerrorString());
return nullptr;
}
munmap(base, memory_size);
m_reserved_region = base;
m_reserved_region_size = memory_size;
return static_cast<u8*>(base);
}
void MemArena::ReleaseMemoryRegion()
{
if (m_reserved_region)
{
munmap(m_reserved_region, m_reserved_region_size);
m_reserved_region = nullptr;
}
}
void* MemArena::MapInMemoryRegion(s64 offset, size_t size, void* base)
{
void* retval = mmap(base, size, PROT_READ | PROT_WRITE,
MAP_SHARED | ((base == nullptr) ? 0 : MAP_FIXED), fd, offset);
void* retval = mmap(base, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, m_shm_fd, offset);
if (retval == MAP_FAILED)
{
NOTICE_LOG_FMT(MEMMAP, "mmap failed");
@ -122,6 +135,8 @@ void* MemArena::MapInMemoryRegion(s64 offset, size_t size, void* base)
void MemArena::UnmapFromMemoryRegion(void* view, size_t size)
{
munmap(view, size);
void* retval = mmap(view, size, PROT_NONE, MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
if (retval == MAP_FAILED)
NOTICE_LOG_FMT(MEMMAP, "mmap failed");
}
} // namespace Common