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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "db/malloc_stats.h"
#ifndef ROCKSDB_LITE
#include <string.h>
#include <memory>
#include "port/jemalloc_helper.h"
namespace ROCKSDB_NAMESPACE {
#ifdef ROCKSDB_JEMALLOC
struct MallocStatus {
char* cur;
char* end;
};
static void GetJemallocStatus(void* mstat_arg, const char* status) {
MallocStatus* mstat = reinterpret_cast<MallocStatus*>(mstat_arg);
size_t status_len = status ? strlen(status) : 0;
size_t buf_size = (size_t)(mstat->end - mstat->cur);
if (!status_len || status_len > buf_size) {
return;
}
snprintf(mstat->cur, buf_size, "%s", status);
mstat->cur += status_len;
}
void DumpMallocStats(std::string* stats) {
if (!HasJemalloc()) {
return;
}
MallocStatus mstat;
const unsigned int kMallocStatusLen = 1000000;
std::unique_ptr<char[]> buf{new char[kMallocStatusLen + 1]};
mstat.cur = buf.get();
mstat.end = buf.get() + kMallocStatusLen;
malloc_stats_print(GetJemallocStatus, &mstat, "");
stats->append(buf.get());
}
#else
void DumpMallocStats(std::string*) {}
#endif // ROCKSDB_JEMALLOC
} // namespace ROCKSDB_NAMESPACE
#endif // !ROCKSDB_LITE
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