8a643b70fd
Summary: Declare Jemalloc non-standard APIs as weak symbols, so that if Jemalloc is linked with the binary, these symbols will be replaced by Jemalloc's, otherwise they will be nullptr. This is similar to how folly detect jemalloc, but we assume the main program use jemalloc as long as jemalloc is linked: https://github.com/facebook/folly/blob/master/folly/memory/Malloc.h#L147 Pull Request resolved: https://github.com/facebook/rocksdb/pull/4844 Differential Revision: D13574934 Pulled By: yiwu-arbug fbshipit-source-id: 7ea871beb1be7d5a1259cc38f9b78078793db2db
60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "db/malloc_stats.h"
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#ifndef ROCKSDB_LITE
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#include <memory>
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#include <string.h>
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#include "port/jemalloc_helper.h"
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namespace rocksdb {
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#ifdef ROCKSDB_JEMALLOC
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#ifdef JEMALLOC_NO_RENAME
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#define malloc_stats_print je_malloc_stats_print
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#endif
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typedef struct {
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char* cur;
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char* end;
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} MallocStatus;
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static void GetJemallocStatus(void* mstat_arg, const char* status) {
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MallocStatus* mstat = reinterpret_cast<MallocStatus*>(mstat_arg);
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size_t status_len = status ? strlen(status) : 0;
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size_t buf_size = (size_t)(mstat->end - mstat->cur);
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if (!status_len || status_len > buf_size) {
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return;
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}
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snprintf(mstat->cur, buf_size, "%s", status);
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mstat->cur += status_len;
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}
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void DumpMallocStats(std::string* stats) {
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if (!HasJemalloc()) {
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return;
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}
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MallocStatus mstat;
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const unsigned int kMallocStatusLen = 1000000;
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std::unique_ptr<char[]> buf{new char[kMallocStatusLen + 1]};
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mstat.cur = buf.get();
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mstat.end = buf.get() + kMallocStatusLen;
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malloc_stats_print(GetJemallocStatus, &mstat, "");
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stats->append(buf.get());
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}
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#else
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void DumpMallocStats(std::string*) {}
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#endif // ROCKSDB_JEMALLOC
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} // namespace rocksdb
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#endif // !ROCKSDB_LITE
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