enum class RegionType { Unknown = 0, Heap = 1, Data = 2 };
-enum class StorageType { NoData = 0, Flat = 1, Chunked = 2, Privatized = 3 };
-
-class Buffer {
-private:
- void* data_ = nullptr;
- std::size_t size_;
-
- explicit Buffer(std::size_t size) : size_(size) { data_ = ::operator new(size_); }
-
- Buffer(void* data, std::size_t size) : data_(data), size_(size) {}
-
-public:
- Buffer() = default;
- void clear() noexcept
- {
- ::operator delete(data_);
- data_ = nullptr;
- size_ = 0;
- }
-
- ~Buffer() noexcept { clear(); }
-
- static Buffer malloc(std::size_t size) { return Buffer(size); }
-
- // No copy
- Buffer(Buffer const& buffer) = delete;
- Buffer& operator=(Buffer const& buffer) = delete;
-
- // Move
- Buffer(Buffer&& that) noexcept : data_(that.data_), size_(that.size_)
- {
- that.data_ = nullptr;
- that.size_ = 0;
- }
- Buffer& operator=(Buffer&& that) noexcept
- {
- clear();
- data_ = that.data_;
- size_ = that.size_;
- that.data_ = nullptr;
- that.size_ = 0;
- return *this;
- }
-
- void* get() { return data_; }
- const void* get() const { return data_; }
- std::size_t size() const { return size_; }
-};
-
-/** A copy/snapshot of a given memory region
- *
- * Different types of region snapshot storage types exist:
- *
- * * flat/dense snapshots are a simple copy of the region;
- *
- * * sparse/per-page snapshots are snaapshots which shared
- * identical pages.
- *
- * * privatized (SMPI global variable privatization).
- *
- * This is handled with a variant based approach:
- *
- * * `storage_type` identified the type of storage;
- *
- * * an anonymous enum is used to distinguish the relevant types for
- * each type.
- */
+/** A copy/snapshot of a given memory region, where identical pages are stored only once */
class RegionSnapshot {
public:
static const RegionType UnknownRegion = RegionType::Unknown;
protected:
RegionType region_type_ = UnknownRegion;
- StorageType storage_type_ = StorageType::NoData;
simgrid::mc::ObjectInformation* object_info_ = nullptr;
/** @brief Virtual address of the region in the simulated process */
/** @brief Size of the data region in bytes */
std::size_t size_ = 0;
- /** @brief Permanent virtual address of the region
- *
- * This is usually the same address as the simuilated process address.
- * However, when using SMPI privatization of global variables,
- * each SMPI process has its own set of global variables stored
- * at a different virtual address. The scheduler maps those region
- * on the region of the global variables.
- *
- * */
- void* permanent_addr_ = nullptr;
-
- Buffer flat_data_;
- ChunkedData page_numbers_;
- std::vector<std::unique_ptr<RegionSnapshot>> privatized_regions_;
+ ChunkedData chunks_;
public:
- RegionSnapshot() {}
- RegionSnapshot(RegionType type, void* start_addr, void* permanent_addr, size_t size)
- : region_type_(type)
- , start_addr_(start_addr)
- , size_(size)
- , permanent_addr_(permanent_addr)
- {
- }
+ RegionSnapshot(RegionType type, void* start_addr, size_t size);
~RegionSnapshot() = default;
RegionSnapshot(RegionSnapshot const&) = delete;
RegionSnapshot& operator=(RegionSnapshot const&) = delete;
RegionSnapshot(RegionSnapshot&& that)
: region_type_(that.region_type_)
- , storage_type_(that.storage_type_)
, object_info_(that.object_info_)
, start_addr_(that.start_addr_)
, size_(that.size_)
- , permanent_addr_(that.permanent_addr_)
- , flat_data_(std::move(that.flat_data_))
- , page_numbers_(std::move(that.page_numbers_))
- , privatized_regions_(std::move(that.privatized_regions_))
+ , chunks_(std::move(that.chunks_))
{
that.clear();
}
RegionSnapshot& operator=(RegionSnapshot&& that)
{
region_type_ = that.region_type_;
- storage_type_ = that.storage_type_;
object_info_ = that.object_info_;
start_addr_ = that.start_addr_;
size_ = that.size_;
- permanent_addr_ = that.permanent_addr_;
- flat_data_ = std::move(that.flat_data_);
- page_numbers_ = std::move(that.page_numbers_);
- privatized_regions_ = std::move(that.privatized_regions_);
+ chunks_ = std::move(that.chunks_);
that.clear();
return *this;
}
void clear()
{
region_type_ = UnknownRegion;
- storage_type_ = StorageType::NoData;
- privatized_regions_.clear();
- page_numbers_.clear();
- flat_data_.clear();
+ chunks_.clear();
object_info_ = nullptr;
start_addr_ = nullptr;
size_ = 0;
- permanent_addr_ = nullptr;
}
- void clear_data()
- {
- storage_type_ = StorageType::NoData;
- flat_data_.clear();
- page_numbers_.clear();
- privatized_regions_.clear();
- }
-
- const Buffer& flat_data() const { return flat_data_; }
- Buffer& flat_data() { return flat_data_; }
-
- ChunkedData const& page_data() const { return page_numbers_; }
-
- std::vector<std::unique_ptr<RegionSnapshot>> const& privatized_data() const { return privatized_regions_; }
- std::vector<std::unique_ptr<RegionSnapshot>>& privatized_data() { return privatized_regions_; }
+ ChunkedData const& get_chunks() const { return chunks_; }
simgrid::mc::ObjectInformation* object_info() const { return object_info_; }
void object_info(simgrid::mc::ObjectInformation* info) { object_info_ = info; }
RemotePtr<void> start() const { return remote(start_addr_); }
RemotePtr<void> end() const { return remote((char*)start_addr_ + size_); }
- RemotePtr<void> permanent_address() const { return remote(permanent_addr_); }
std::size_t size() const { return size_; }
- StorageType storage_type() const { return storage_type_; }
RegionType region_type() const { return region_type_; }
bool contain(RemotePtr<void> p) const { return p >= start() && p < end(); }
void restore();
};
-class RegionDense : public RegionSnapshot {
-public:
- RegionDense(RegionType type, void* start_addr, void* data_addr, std::size_t size);
-};
-class RegionSparse : public RegionSnapshot {
-public:
- RegionSparse(RegionType type, void* start_addr, void* data_addr, std::size_t size);
-};
-class RegionPrivatized : public RegionSnapshot {
-public:
- RegionPrivatized(RegionType type, void* start_addr, void* data_addr, std::size_t size);
-};
-
-RegionSnapshot* region(RegionType type, void* start_addr, void* data_addr, std::size_t size);
-
} // namespace mc
} // namespace simgrid
