Added initial memory pool support.

src/crypto/common/MemoryPool.cpp

@@ -0,0 +1,95 @@
+/* XMRig
+ * Copyright 2010      Jeff Garzik <jgarzik@pobox.com>
+ * Copyright 2012-2014 pooler      <pooler@litecoinpool.org>
+ * Copyright 2014      Lucas Jones <https://github.com/lucasjones>
+ * Copyright 2014-2016 Wolf9466    <https://github.com/OhGodAPet>
+ * Copyright 2016      Jay D Dee   <jayddee246@gmail.com>
+ * Copyright 2017-2018 XMR-Stak    <https://github.com/fireice-uk>, <https://github.com/psychocrypt>
+ * Copyright 2018      Lee Clagett <https://github.com/vtnerd>
+ * Copyright 2018-2019 SChernykh   <https://github.com/SChernykh>
+ * Copyright 2018-2019 tevador     <tevador@gmail.com>
+ * Copyright 2016-2019 XMRig       <https://github.com/xmrig>, <support@xmrig.com>
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "crypto/common/MemoryPool.h"
+#include "crypto/common/VirtualMemory.h"
+
+
+#include <cassert>
+
+
+namespace xmrig {
+
+
+constexpr size_t pageSize = 2 * 1024 * 1024;
+
+
+} // namespace xmrig
+
+
+xmrig::MemoryPool::MemoryPool(size_t size, bool hugePages, uint32_t node) :
+    m_size(size)
+{
+    if (!size) {
+        return;
+    }
+
+    m_memory = new VirtualMemory(size * pageSize, hugePages, false, node);
+}
+
+
+xmrig::MemoryPool::~MemoryPool()
+{
+    delete m_memory;
+}
+
+
+bool xmrig::MemoryPool::isHugePages(uint32_t) const
+{
+    return m_memory && m_memory->isHugePages();
+}
+
+
+uint8_t *xmrig::MemoryPool::get(size_t size, uint32_t)
+{
+    assert(!(size % pageSize));
+
+    if (!m_memory || (m_memory->size() - m_offset) < size) {
+        return nullptr;
+    }
+
+    uint8_t *out = m_memory->scratchpad() + m_offset;
+
+    m_offset += size;
+    ++m_refs;
+
+    return out;
+}
+
+
+void xmrig::MemoryPool::release(uint32_t)
+{
+    assert(m_refs > 0);
+
+    if (m_refs > 0) {
+        --m_refs;
+    }
+
+    if (m_refs == 0) {
+        m_offset = 0;
+    }
+}