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/*
// Copyright (c) 2010-2017 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/
#include <iostream>
#include <sys/mman.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <cerrno>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#define USEHP
using namespace std;
#include "allocator.hpp"
Allocator::Allocator(size_t size, size_t threshold)
: m_size(size), m_threshold(threshold), m_alloc_offset(0)
{
#ifdef USEHP
int fd = open("/mnt/huge/hp", O_CREAT | O_RDWR, 0755);
if (fd < 0) {
cerr << "Allocator failed to open huge page file descriptor: " << strerror(errno) << endl;
exit(EXIT_FAILURE);
}
m_mem = (uint8_t *)mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (m_mem == MAP_FAILED) {
perror("mmap");
unlink("/mnt/huge");
cerr << "Allocator mmap failed: " << strerror(errno) << endl;
exit (EXIT_FAILURE);
}
#else
m_mem = new uint8_t[size];
#endif
}
Allocator::~Allocator()
{
#ifdef USEHP
munmap((void *)m_mem, m_size);
#else
delete[] m_mem;
#endif
}
void *Allocator::alloc(size_t size)
{
void *ret = &m_mem[m_alloc_offset];
m_alloc_offset += size;
return ret;
}
void Allocator::reset()
{
m_alloc_offset = 0;
}
size_t Allocator::getFreeSize() const
{
return m_size - m_alloc_offset;
}
bool Allocator::lowThresholdReached() const
{
return (m_size - m_alloc_offset) < m_threshold;
}
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