From e6918187568dbd01842d8d1d2c808ce16a894239 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 21 Apr 2024 13:54:28 +0200
Subject: Adding upstream version 18.2.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/rocksdb/memory/jemalloc_nodump_allocator.h | 94 ++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 src/rocksdb/memory/jemalloc_nodump_allocator.h

(limited to 'src/rocksdb/memory/jemalloc_nodump_allocator.h')

diff --git a/src/rocksdb/memory/jemalloc_nodump_allocator.h b/src/rocksdb/memory/jemalloc_nodump_allocator.h
new file mode 100644
index 000000000..a1e1547d7
--- /dev/null
+++ b/src/rocksdb/memory/jemalloc_nodump_allocator.h
@@ -0,0 +1,94 @@
+//  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).
+
+#pragma once
+
+#include <atomic>
+#include <vector>
+
+#include "port/jemalloc_helper.h"
+#include "port/port.h"
+#include "rocksdb/memory_allocator.h"
+#include "util/thread_local.h"
+#include "utilities/memory_allocators.h"
+
+#if defined(ROCKSDB_JEMALLOC) && defined(ROCKSDB_PLATFORM_POSIX)
+
+#include <sys/mman.h>
+
+#if (JEMALLOC_VERSION_MAJOR >= 5) && defined(MADV_DONTDUMP)
+#define ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
+#endif  // (JEMALLOC_VERSION_MAJOR >= 5) && MADV_DONTDUMP
+#endif  // ROCKSDB_JEMALLOC && ROCKSDB_PLATFORM_POSIX
+
+namespace ROCKSDB_NAMESPACE {
+class JemallocNodumpAllocator : public BaseMemoryAllocator {
+ public:
+  explicit JemallocNodumpAllocator(JemallocAllocatorOptions& options);
+#ifdef ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
+  ~JemallocNodumpAllocator();
+#endif  // ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
+
+  static const char* kClassName() { return "JemallocNodumpAllocator"; }
+  const char* Name() const override { return kClassName(); }
+  static bool IsSupported() {
+    std::string unused;
+    return IsSupported(&unused);
+  }
+  static bool IsSupported(std::string* why);
+  bool IsMutable() const { return arena_index_ == 0; }
+
+  Status PrepareOptions(const ConfigOptions& config_options) override;
+
+#ifdef ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
+  void* Allocate(size_t size) override;
+  void Deallocate(void* p) override;
+  size_t UsableSize(void* p, size_t allocation_size) const override;
+#endif  // ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
+
+ private:
+#ifdef ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
+  Status InitializeArenas();
+
+  friend Status NewJemallocNodumpAllocator(
+      JemallocAllocatorOptions& options,
+      std::shared_ptr<MemoryAllocator>* memory_allocator);
+
+  // Custom alloc hook to replace jemalloc default alloc.
+  static void* Alloc(extent_hooks_t* extent, void* new_addr, size_t size,
+                     size_t alignment, bool* zero, bool* commit,
+                     unsigned arena_ind);
+
+  // Destroy arena on destruction of the allocator, or on failure.
+  static Status DestroyArena(unsigned arena_index);
+
+  // Destroy tcache on destruction of the allocator, or thread exit.
+  static void DestroyThreadSpecificCache(void* ptr);
+
+  // Get or create tcache. Return flag suitable to use with `mallocx`:
+  // either MALLOCX_TCACHE_NONE or MALLOCX_TCACHE(tc).
+  int GetThreadSpecificCache(size_t size);
+#endif  // ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
+  JemallocAllocatorOptions options_;
+
+#ifdef ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
+  // A function pointer to jemalloc default alloc. Use atomic to make sure
+  // NewJemallocNodumpAllocator is thread-safe.
+  //
+  // Hack: original_alloc_ needs to be static for Alloc() to access it.
+  // alloc needs to be static to pass to jemalloc as function pointer.
+  static std::atomic<extent_alloc_t*> original_alloc_;
+
+  // Custom hooks has to outlive corresponding arena.
+  std::unique_ptr<extent_hooks_t> arena_hooks_;
+
+  // Hold thread-local tcache index.
+  ThreadLocalPtr tcache_;
+#endif  // ROCKSDB_JEMALLOC_NODUMP_ALLOCATOR
+
+  // Arena index.
+  unsigned arena_index_;
+};
+}  // namespace ROCKSDB_NAMESPACE
-- 
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