Linux: added support for transparent huge pages

src/crypto/common/MemoryPool.cpp

@@ -49,7 +49,7 @@ xmrig::MemoryPool::MemoryPool(size_t size, bool hugePages, uint32_t node)
 
     constexpr size_t alignment = 1 << 24;
 
-    m_memory = new VirtualMemory(size * pageSize + alignment, hugePages, false, false, node);
+    m_memory = new VirtualMemory(size * pageSize + alignment, hugePages, false, false, node, VirtualMemory::kDefaultHugePageSize);
 
     m_alignOffset = (alignment - (((size_t)m_memory->scratchpad()) % alignment)) % alignment;
 }

src/crypto/common/VirtualMemory.cpp

@@ -75,6 +75,16 @@ xmrig::VirtualMemory::VirtualMemory(size_t size, bool hugePages, bool oneGbPages
     }
 
     m_scratchpad = static_cast<uint8_t*>(_mm_malloc(m_size, alignSize));
+
+    // Huge pages failed to allocate, but try to enable transparent huge pages for the range
+    if (alignSize >= kDefaultHugePageSize) {
+        if (m_scratchpad) {
+            adviseLargePages(m_scratchpad, m_size);
+        }
+        else {
+            m_scratchpad = static_cast<uint8_t*>(_mm_malloc(m_size, 64));
+        }
+    }
 }
 
 

src/crypto/common/VirtualMemory.h

@@ -65,6 +65,7 @@ public:
     static void *allocateExecutableMemory(size_t size, bool hugePages);
     static void *allocateLargePagesMemory(size_t size);
     static void *allocateOneGbPagesMemory(size_t size);
+    static bool adviseLargePages(void *p, size_t size);
     static void destroy();
     static void flushInstructionCache(void *p, size_t size);
     static void freeLargePagesMemory(void *p, size_t size);

src/crypto/common/VirtualMemory_unix.cpp

@@ -276,6 +276,16 @@ bool xmrig::VirtualMemory::allocateOneGbPagesMemory()
 }
 
 
+bool xmrig::VirtualMemory::adviseLargePages(void *p, size_t size)
+{
+#   ifdef XMRIG_OS_LINUX
+    return (madvise(p, size, MADV_HUGEPAGE) == 0);
+#   else
+    return false;
+#   endif
+}
+
+
 void xmrig::VirtualMemory::freeLargePagesMemory()
 {
     if (m_flags.test(FLAG_LOCK)) {

src/crypto/common/VirtualMemory_win.cpp

@@ -260,6 +260,12 @@ bool xmrig::VirtualMemory::allocateOneGbPagesMemory()
 }
 
 
+bool xmrig::VirtualMemory::adviseLargePages(void *p, size_t size)
+{
+    return false;
+}
+
+
 void xmrig::VirtualMemory::freeLargePagesMemory()
 {
     freeLargePagesMemory(m_scratchpad, m_size);