tracking_resource_adaptor.hpp

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/*
 * SPDX-FileCopyrightText: Copyright (c) 2020-2025, NVIDIA CORPORATION.
 * SPDX-License-Identifier: Apache-2.0
 */
#pragma once
 
#include <rmm/detail/error.hpp>
#include <rmm/detail/export.hpp>
#include <rmm/detail/stack_trace.hpp>
#include <rmm/logger.hpp>
#include <rmm/mr/device_memory_resource.hpp>
#include <rmm/mr/per_device_resource.hpp>
#include <rmm/resource_ref.hpp>
 
#include <atomic>
#include <cstddef>
#include <map>
#include <mutex>
#include <shared_mutex>
#include <sstream>
 
namespace RMM_NAMESPACE {
namespace mr {
template <typename Upstream>
class tracking_resource_adaptor final : public device_memory_resource {
 public:
  using read_lock_t =
    std::shared_lock<std::shared_mutex>;  
  using write_lock_t =
    std::unique_lock<std::shared_mutex>;  
  struct allocation_info {
    std::unique_ptr<rmm::detail::stack_trace> strace;  
    std::size_t allocation_size;                       
 
    allocation_info() = delete;
    allocation_info(std::size_t size, bool capture_stack)
      : strace{[&]() {
          return capture_stack ? std::make_unique<rmm::detail::stack_trace>() : nullptr;
        }()},
        allocation_size{size} {};
  };
 
  tracking_resource_adaptor(device_async_resource_ref upstream, bool capture_stacks = false)
    : capture_stacks_{capture_stacks}, allocated_bytes_{0}, upstream_{upstream}
  {
  }
 
  tracking_resource_adaptor(Upstream* upstream, bool capture_stacks = false)
    : capture_stacks_{capture_stacks},
      allocated_bytes_{0},
      upstream_{to_device_async_resource_ref_checked(upstream)}
  {
  }
 
  tracking_resource_adaptor()                                 = delete;
  ~tracking_resource_adaptor() override                       = default;
  tracking_resource_adaptor(tracking_resource_adaptor const&) = delete;
  tracking_resource_adaptor(tracking_resource_adaptor&&) noexcept =
    default;  
  tracking_resource_adaptor& operator=(tracking_resource_adaptor const&) = delete;
  tracking_resource_adaptor& operator=(tracking_resource_adaptor&&) noexcept =
    default;  
 
  [[nodiscard]] rmm::device_async_resource_ref get_upstream_resource() const noexcept
  {
    return upstream_;
  }
 
  std::map<void*, allocation_info> const& get_outstanding_allocations() const noexcept
  {
    return allocations_;
  }
 
  std::size_t get_allocated_bytes() const noexcept { return allocated_bytes_; }
 
  std::string get_outstanding_allocations_str() const
  {
    read_lock_t lock(mtx_);
 
    std::ostringstream oss;
 
    if (!allocations_.empty()) {
      for (auto const& alloc : allocations_) {
        oss << alloc.first << ": " << alloc.second.allocation_size << " B";
        if (alloc.second.strace != nullptr) {
          oss << " : callstack:" << std::endl << *alloc.second.strace;
        }
        oss << std::endl;
      }
    }
 
    return oss.str();
  }
 
  void log_outstanding_allocations() const
  {
#if RMM_LOG_ACTIVE_LEVEL <= RMM_LOG_LEVEL_DEBUG
    RMM_LOG_DEBUG("Outstanding Allocations: %s", get_outstanding_allocations_str());
#endif  // RMM_LOG_ACTIVE_LEVEL <= RMM_LOG_LEVEL_DEBUG
  }
 
 private:
  void* do_allocate(std::size_t bytes, cuda_stream_view stream) override
  {
    void* ptr = get_upstream_resource().allocate(stream, bytes);
    // track it.
    {
      write_lock_t lock(mtx_);
      allocations_.emplace(ptr, allocation_info{bytes, capture_stacks_});
    }
    allocated_bytes_ += bytes;
 
    return ptr;
  }
 
  void do_deallocate(void* ptr, std::size_t bytes, cuda_stream_view stream) noexcept override
  {
    get_upstream_resource().deallocate(stream, ptr, bytes);
    {
      write_lock_t lock(mtx_);
 
      const auto found = allocations_.find(ptr);
 
      // Ensure the allocation is found and the number of bytes match
      if (found == allocations_.end()) {
        // Don't throw but log an error. Throwing in a destructor (or any noexcept) will call
        // std::terminate
        RMM_LOG_ERROR(
          "Deallocating a pointer that was not tracked. Ptr: %p [%zuB], Current Num. Allocations: "
          "%zu",
          ptr,
          bytes,
          this->allocations_.size());
      } else {
        auto const allocated_bytes = found->second.allocation_size;
 
        allocations_.erase(found);
 
        if (allocated_bytes != bytes) {
          // Don't throw but log an error. Throwing in a destructor (or any noexcept) will call
          // std::terminate
          RMM_LOG_ERROR(
            "Alloc bytes (%zu) and Dealloc bytes (%zu) do not match", allocated_bytes, bytes);
 
          bytes = allocated_bytes;
        }
      }
    }
    allocated_bytes_ -= bytes;
  }
 
  bool do_is_equal(device_memory_resource const& other) const noexcept override
  {
    if (this == &other) { return true; }
    auto cast = dynamic_cast<tracking_resource_adaptor<Upstream> const*>(&other);
    if (cast == nullptr) { return false; }
    return get_upstream_resource() == cast->get_upstream_resource();
  }
 
  bool capture_stacks_;                           // whether or not to capture call stacks
  std::map<void*, allocation_info> allocations_;  // map of active allocations
  std::atomic<std::size_t> allocated_bytes_;      // number of bytes currently allocated
  std::shared_mutex mutable mtx_;                 // mutex for thread safe access to allocations_
  device_async_resource_ref upstream_;            // the upstream resource used for satisfying
                                                  // allocation requests
};
  // end of group
}  // namespace mr
}  // namespace RMM_NAMESPACE