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RandomX: allocate 2 MB pages for generated code, if possible

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+0.2% boost on Ryzen 7 3700X
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SChernykh
2020-10-07 10:35:10 +02:00
parent ba47219185
commit a8466a139c
3 changed files with 22 additions and 3 deletions
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15
src/crypto/common/VirtualMemory_unix.cpp
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@@ -68,7 +68,20 @@ void *xmrig::VirtualMemory::allocateExecutableMemory(size_t size)
# if defined(__APPLE__)
void *mem = mmap(0, size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANON, -1, 0);
# else
void *mem = mmap(0, size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
# if defined(MAP_HUGE_2MB)
constexpr int flag_2mb = MAP_HUGE_2MB;
# elif defined(MAP_HUGE_SHIFT)
constexpr int flag_2mb = (21 << MAP_HUGE_SHIFT);
# else
constexpr int flag_2mb = 0;
# endif
void *mem = mmap(0, align(size), PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS | MAP_POPULATE | flag_2mb, -1, 0);
if (!mem) {
void *mem = mmap(0, size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
}
# endif
return mem == MAP_FAILED ? nullptr : mem;