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/**
* Copyright (C) 2009-2014 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#include "mongo/platform/basic.h"
#include "mongo/db/storage/mmap_v1/aligned_builder.h"
#include "mongo/util/debug_util.h"
#include "mongo/util/log.h"
namespace mongo {
using std::endl;
AlignedBuilder::AlignedBuilder(unsigned initSize) {
_len = 0;
_malloc(initSize);
uassert(13584, "out of memory AlignedBuilder", _p._allocationAddress);
}
BOOST_STATIC_ASSERT(sizeof(void*) == sizeof(size_t));
/** reset for a re-use. shrinks if > 128MB */
void AlignedBuilder::reset() {
_len = 0;
RARELY {
const unsigned sizeCap = 128 * 1024 * 1024;
if (_p._size > sizeCap)
_realloc(sizeCap, _len);
}
}
/** reset with a hint as to the upcoming needed size specified */
void AlignedBuilder::reset(unsigned sz) {
_len = 0;
unsigned Q = 32 * 1024 * 1024 - 1;
unsigned want = (sz + Q) & (~Q);
if (_p._size == want) {
return;
}
if (_p._size > want) {
if (_p._size <= 64 * 1024 * 1024)
return;
bool downsize = false;
RARELY {
downsize = true;
}
if (!downsize)
return;
}
_realloc(want, _len);
}
void AlignedBuilder::mallocSelfAligned(unsigned sz) {
verify(sz == _p._size);
void* p = malloc(sz + Alignment - 1);
_p._allocationAddress = p;
size_t s = (size_t)p;
size_t sold = s;
s += Alignment - 1;
s = (s / Alignment) * Alignment;
verify(s >= sold); // beginning
verify((s + sz) <= (sold + sz + Alignment - 1)); // end
_p._data = (char*)s;
}
/* "slow"/infrequent portion of 'grow()' */
void NOINLINE_DECL AlignedBuilder::growReallocate(unsigned oldLen) {
const unsigned MB = 1024 * 1024;
const unsigned kMaxSize = (sizeof(int*) == 4) ? 512 * MB : 2000 * MB;
const unsigned kWarnSize = (sizeof(int*) == 4) ? 256 * MB : 512 * MB;
const unsigned oldSize = _p._size;
// Warn for unexpectedly large buffer
wassert(_len <= kWarnSize);
// Check validity of requested size
invariant(_len > oldSize);
if (_len > kMaxSize) {
log() << "error writing journal: too much uncommitted data (" << _len << " bytes)";
log() << "shutting down immediately to avoid corruption";
fassert(28614, _len <= kMaxSize);
}
// Use smaller maximum for debug builds, as we should never be close the the maximum
dassert(_len <= 256 * MB);
// Compute newSize by doubling the existing maximum size until the maximum is reached
invariant(oldSize > 0);
uint64_t newSize = oldSize; // use 64 bits to defend against accidental overflow
while (newSize < _len) {
newSize *= 2;
}
if (newSize > kMaxSize) {
newSize = kMaxSize;
}
_realloc(newSize, oldLen);
}
void AlignedBuilder::_malloc(unsigned sz) {
_p._size = sz;
#if defined(_WIN32)
void* p = VirtualAlloc(0, sz, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
_p._allocationAddress = p;
_p._data = (char*)p;
#elif defined(__linux__)
// in theory #ifdef _POSIX_VERSION should work, but it doesn't on OS X 10.4, and needs to be tested on solaris.
// so for now, linux only for this.
void* p = 0;
int res = posix_memalign(&p, Alignment, sz);
massert(13524, "out of memory AlignedBuilder", res == 0);
_p._allocationAddress = p;
_p._data = (char*)p;
#else
mallocSelfAligned(sz);
verify(((size_t)_p._data) % Alignment == 0);
#endif
}
void AlignedBuilder::_realloc(unsigned newSize, unsigned oldLen) {
// posix_memalign alignment is not maintained on reallocs, so we can't use realloc().
AllocationInfo old = _p;
_malloc(newSize);
verify(oldLen <= _len);
memcpy(_p._data, old._data, oldLen);
_free(old._allocationAddress);
}
void AlignedBuilder::_free(void* p) {
#if defined(_WIN32)
VirtualFree(p, 0, MEM_RELEASE);
#else
free(p);
#endif
}
void AlignedBuilder::kill() {
_free(_p._allocationAddress);
_p._allocationAddress = 0;
_p._data = 0;
}
}
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