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Improve low-level mmap utilities (Linux/BSD)

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Add madvise (MADV_WILLNEED) on utils::memory_commit
Add madvise (MADV_FREE or MADV_DONTNEED) on utils::memory_decommit
Improve shm_open pseudo-random name (not used on Linux)
This commit is contained in:
Nekotekina 2020-11-04 14:56:40 +03:00
parent ba5ed5f380
commit b66628baca
2 changed files with 19 additions and 5 deletions
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4
Utilities/JIT.cpp
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@ -88,9 +88,7 @@ static u8* add_jit_memory(std::size_t size, uint align)
if (olda != newa) [[unlikely]]
{
#ifdef CAN_OVERCOMMIT
madvise(pointer + olda, newa - olda, MADV_WILLNEED);
#else
#ifndef CAN_OVERCOMMIT
// Commit more memory
utils::memory_commit(pointer + olda, newa - olda, Prot);
#endif

20
Utilities/VirtualMemory.cpp
View File

@ -112,6 +112,7 @@ namespace utils
#else
const u64 ptr64 = reinterpret_cast<u64>(pointer);
verify(HERE), ::mprotect(reinterpret_cast<void*>(ptr64 & -4096), size + (ptr64 & 4095), +prot) != -1;
verify(HERE), ::madvise(reinterpret_cast<void*>(ptr64 & -4096), size + (ptr64 & 4095), MADV_WILLNEED) != -1;
#endif
}
@ -120,7 +121,13 @@ namespace utils
#ifdef _WIN32
verify(HERE), ::VirtualFree(pointer, size, MEM_DECOMMIT);
#else
const u64 ptr64 = reinterpret_cast<u64>(pointer);
verify(HERE), ::mmap(pointer, size, PROT_NONE, MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0) != reinterpret_cast<void*>(-1);
#ifdef MADV_FREE
verify(HERE), ::madvise(reinterpret_cast<void*>(ptr64 & -4096), size + (ptr64 & 4095), MADV_FREE) != -1;
#else
verify(HERE), ::madvise(reinterpret_cast<void*>(ptr64 & -4096), size + (ptr64 & 4095), MADV_DONTNEED) != -1;
#endif
#endif
}
@ -130,7 +137,14 @@ namespace utils
memory_decommit(pointer, size);
memory_commit(pointer, size, prot);
#else
const u64 ptr64 = reinterpret_cast<u64>(pointer);
#ifdef MADV_FREE
verify(HERE), ::madvise(reinterpret_cast<void*>(ptr64 & -4096), size + (ptr64 & 4095), MADV_FREE) != -1;
#else
verify(HERE), ::madvise(reinterpret_cast<void*>(ptr64 & -4096), size + (ptr64 & 4095), MADV_DONTNEED) != -1;
#endif
verify(HERE), ::mmap(pointer, size, +prot, MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0) != reinterpret_cast<void*>(-1);
verify(HERE), ::madvise(reinterpret_cast<void*>(ptr64 & -4096), size + (ptr64 & 4095), MADV_WILLNEED) != -1;
#endif
}
@ -178,7 +192,9 @@ namespace utils
verify(HERE), m_file >= 0;
verify(HERE), ::ftruncate(m_file, m_size) >= 0;
#else
while ((m_file = ::shm_open("/rpcs3-mem1", O_RDWR | O_CREAT | O_EXCL, S_IWUSR | S_IRUSR)) == -1)
const std::string name = "/rpcs3-mem-" + std::to_string(reinterpret_cast<u64>(this));
while ((m_file = ::shm_open(name.c_str(), O_RDWR | O_CREAT | O_EXCL, S_IWUSR | S_IRUSR)) == -1)
{
if (errno == EMFILE)
{
@ -188,7 +204,7 @@ namespace utils
verify(HERE), errno == EEXIST;
}
verify(HERE), ::shm_unlink("/rpcs3-mem1") >= 0;
verify(HERE), ::shm_unlink(name.c_str()) >= 0;
verify(HERE), ::ftruncate(m_file, m_size) >= 0;
#endif
}