COMPMID-485: Offset-based memory manager support.

Adds support for offset-based memory mappings used from CPU system
memory and SVM based allocations.

Change-Id: Ibee6a3c02a61df9b11fe8878cfe40dc6fd9a4be0
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/88307
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>

10 files changed, 503 insertions, 102 deletions

diff --git a/arm_compute/runtime/BlobLifetimeManager.h b/arm_compute/runtime/BlobLifetimeManager.h
index ec43f47fe6..edf4d43421 100644
--- a/arm_compute/runtime/BlobLifetimeManager.h
+++ b/arm_compute/runtime/BlobLifetimeManager.h
@@ -24,21 +24,20 @@
 #ifndef __ARM_COMPUTE_BLOBLIFETIMEMANAGER_H__
 #define __ARM_COMPUTE_BLOBLIFETIMEMANAGER_H__
 
-#include "arm_compute/runtime/ILifetimeManager.h"
+#include "arm_compute/runtime/ISimpleLifetimeManager.h"
 
-#include "arm_compute/runtime/IMemoryGroup.h"
+#include "arm_compute/runtime/IMemoryPool.h"
 #include "arm_compute/runtime/Types.h"
 
 #include <cstddef>
-#include <map>
+#include <memory>
 #include <vector>
 
 namespace arm_compute
 {
-class IMemoryGroup;
-
-/** Class that tracks the lifetime of registered tensors and calculates the systems memory requirements in terms of blobs */
-class BlobLifetimeManager : public ILifetimeManager
+/** Concrete class that tracks the lifetime of registered tensors and
+ *  calculates the systems memory requirements in terms of blobs */
+class BlobLifetimeManager : public ISimpleLifetimeManager
 {
 public:
     /** Constructor */
@@ -53,35 +52,15 @@ public:
     BlobLifetimeManager &operator=(BlobLifetimeManager &&) = default;
 
     // Inherited methods overridden:
-    void register_group(IMemoryGroup *group) override;
-    void start_lifetime(void *obj) override;
-    void end_lifetime(void *obj, void **handle, size_t size) override;
     std::unique_ptr<IMemoryPool> create_pool(IAllocator *allocator) override;
-    bool        are_all_finalized() const override;
     MappingType mapping_type() const override;
 
 private:
-    /** Update blobs and mappings */
-    void update_blobs_and_mappings();
+    // Inherited methods overridden:
+    void update_blobs_and_mappings() override;
 
 private:
-    /** Element struct */
-    struct Element
-    {
-        Element(void *id_ = nullptr, void **handle_ = nullptr, size_t size_ = 0, bool status_ = false)
-            : id(id_), handle(handle_), size(size_), status(status_)
-        {
-        }
-        void *id;      /**< Element id */
-        void **handle; /**< Element's memory handle */
-        size_t size;   /**< Element's size */
-        bool   status; /**< Lifetime status */
-    };
-
-    IMemoryGroup        *_active_group;                               /**< Active group */
-    std::vector<Element> _active_elements;                            /**< A map that contains the active elements */
-    std::map<IMemoryGroup *, std::vector<Element>> _finalized_groups; /**< A map that contains the finalized groups */
-    std::vector<size_t> _blobs;
+    std::vector<size_t> _blobs; /**< Memory blobs' sizes */
 };
-} // arm_compute
+} // namespace arm_compute
 #endif /* __ARM_COMPUTE_BLOBLIFETIMEMANAGER_H__ */
diff --git a/arm_compute/runtime/BlobMemoryPool.h b/arm_compute/runtime/BlobMemoryPool.h
index f703bf0b82..25bfd539f6 100644
--- a/arm_compute/runtime/BlobMemoryPool.h
+++ b/arm_compute/runtime/BlobMemoryPool.h
@@ -79,5 +79,5 @@ private:
     std::vector<void *> _blobs;      /**< Vector holding all the memory blobs */
     std::vector<size_t> _blob_sizes; /**< Sizes of each blob */
 };
-} // arm_compute
+} // namespace arm_compute
 #endif /* __ARM_COMPUTE_BLOBMEMORYPOOL_H__ */
diff --git a/arm_compute/runtime/ILifetimeManager.h b/arm_compute/runtime/ILifetimeManager.h
index 4f9af6f535..6f2c68d372 100644
--- a/arm_compute/runtime/ILifetimeManager.h
+++ b/arm_compute/runtime/ILifetimeManager.h
@@ -28,7 +28,7 @@
 #include "arm_compute/runtime/Types.h"
 
 #include <cstddef>
-#include <vector>
+#include <memory>
 
 namespace arm_compute
 {
@@ -58,6 +58,11 @@ public:
      * @param[in] size   Size of the given object at given time
      */
     virtual void end_lifetime(void *obj, void **handle, size_t size) = 0;
+    /** Checks if the lifetime of the registered object is complete
+     *
+     * @return True if all object lifetimes are finalized else false.
+     */
+    virtual bool are_all_finalized() const = 0;
     /** Creates a memory pool depending on the memory requirements
      *
      * @param allocator Allocator to use
@@ -65,16 +70,11 @@ public:
      * @return A memory pool
      */
     virtual std::unique_ptr<IMemoryPool> create_pool(IAllocator *allocator) = 0;
-    /** Checks if the lifetime of the registered object is complete
-     *
-     * @return True if all object lifetimes are finalized else false.
-     */
-    virtual bool are_all_finalized() const = 0;
     /** Returns the type of mappings that the lifetime manager returns
      *
      * @return Mapping type of the lifetime manager
      */
     virtual MappingType mapping_type() const = 0;
 };
-} // arm_compute
+} // namespace arm_compute
 #endif /* __ARM_COMPUTE_ILIFETIMEMANAGER_H__ */
diff --git a/arm_compute/runtime/ISimpleLifetimeManager.h b/arm_compute/runtime/ISimpleLifetimeManager.h
new file mode 100644
index 0000000000..792ab0b558
--- /dev/null
+++ b/arm_compute/runtime/ISimpleLifetimeManager.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ARM_COMPUTE_ISIMPLELIFETIMEMANAGER_H__
+#define __ARM_COMPUTE_ISIMPLELIFETIMEMANAGER_H__
+
+#include "arm_compute/runtime/ILifetimeManager.h"
+
+#include "arm_compute/runtime/IMemoryPool.h"
+#include "arm_compute/runtime/Types.h"
+
+#include <cstddef>
+#include <map>
+#include <vector>
+
+namespace arm_compute
+{
+class IAllocator;
+class IMemoryGroup;
+
+/** Abstract class of the simple lifetime manager interface */
+class ISimpleLifetimeManager : public ILifetimeManager
+{
+public:
+    /** Constructor */
+    ISimpleLifetimeManager();
+    /** Prevent instances of this class to be copy constructed */
+    ISimpleLifetimeManager(const ISimpleLifetimeManager &) = delete;
+    /** Prevent instances of this class to be copied */
+    ISimpleLifetimeManager &operator=(const ISimpleLifetimeManager &) = delete;
+    /** Allow instances of this class to be move constructed */
+    ISimpleLifetimeManager(ISimpleLifetimeManager &&) = default;
+    /** Allow instances of this class to be moved */
+    ISimpleLifetimeManager &operator=(ISimpleLifetimeManager &&) = default;
+
+    // Inherited methods overridden:
+    void register_group(IMemoryGroup *group) override;
+    void start_lifetime(void *obj) override;
+    void end_lifetime(void *obj, void **handle, size_t size) override;
+    bool are_all_finalized() const override;
+
+protected:
+    /** Update blobs and mappings */
+    virtual void update_blobs_and_mappings() = 0;
+
+protected:
+    /** Element struct */
+    struct Element
+    {
+        Element(void *id_ = nullptr, void **handle_ = nullptr, size_t size_ = 0, bool status_ = false)
+            : id(id_), handle(handle_), size(size_), status(status_)
+        {
+        }
+        void *id;      /**< Element id */
+        void **handle; /**< Element's memory handle */
+        size_t size;   /**< Element's size */
+        bool   status; /**< Lifetime status */
+    };
+
+    IMemoryGroup        *_active_group;                               /**< Active group */
+    std::vector<Element> _active_elements;                            /**< A map that contains the active elements */
+    std::map<IMemoryGroup *, std::vector<Element>> _finalized_groups; /**< A map that contains the finalized groups */
+};
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_ISIMPLELIFETIMEMANAGER_H__ */
diff --git a/arm_compute/runtime/OffsetLifetimeManager.h b/arm_compute/runtime/OffsetLifetimeManager.h
new file mode 100644
index 0000000000..e39d6a0d6a
--- /dev/null
+++ b/arm_compute/runtime/OffsetLifetimeManager.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ARM_COMPUTE_OFFSETLIFETIMEMANAGER_H__
+#define __ARM_COMPUTE_OFFSETLIFETIMEMANAGER_H__
+
+#include "arm_compute/runtime/ISimpleLifetimeManager.h"
+
+#include "arm_compute/runtime/Types.h"
+
+#include <cstddef>
+#include <map>
+#include <vector>
+
+namespace arm_compute
+{
+class IMemoryPool;
+
+/** Concrete class that tracks the lifetime of registered tensors and
+ *  calculates the systems memory requirements in terms of a single blob and a list of offsets */
+class OffsetLifetimeManager : public ISimpleLifetimeManager
+{
+public:
+    /** Constructor */
+    OffsetLifetimeManager();
+    /** Prevent instances of this class to be copy constructed */
+    OffsetLifetimeManager(const OffsetLifetimeManager &) = delete;
+    /** Prevent instances of this class to be copied */
+    OffsetLifetimeManager &operator=(const OffsetLifetimeManager &) = delete;
+    /** Allow instances of this class to be move constructed */
+    OffsetLifetimeManager(OffsetLifetimeManager &&) = default;
+    /** Allow instances of this class to be moved */
+    OffsetLifetimeManager &operator=(OffsetLifetimeManager &&) = default;
+
+    // Inherited methods overridden:
+    std::unique_ptr<IMemoryPool> create_pool(IAllocator *allocator) override;
+    MappingType mapping_type() const override;
+
+private:
+    // Inherited methods overridden:
+    void update_blobs_and_mappings() override;
+
+private:
+    size_t _blob; /**< Memory blob size */
+};
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_OFFSETLIFETIMEMANAGER_H__ */
diff --git a/arm_compute/runtime/OffsetMemoryPool.h b/arm_compute/runtime/OffsetMemoryPool.h
new file mode 100644
index 0000000000..9685fd1319
--- /dev/null
+++ b/arm_compute/runtime/OffsetMemoryPool.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ARM_COMPUTE_OFFSETMEMORYPOOL_H__
+#define __ARM_COMPUTE_OFFSETMEMORYPOOL_H__
+
+#include "arm_compute/runtime/IMemoryPool.h"
+
+#include "arm_compute/runtime/Types.h"
+
+#include <cstddef>
+
+namespace arm_compute
+{
+class IAllocator;
+
+/** Offset based memory pool */
+class OffsetMemoryPool : public IMemoryPool
+{
+public:
+    /** Default Constructor
+     *
+     * @note allocator should outlive the memory pool
+     *
+     * @param[in] allocator Backing memory allocator
+     * @param[in] blob_size Size of the memory be allocated
+     */
+    OffsetMemoryPool(IAllocator *allocator, size_t blob_size);
+    /** Default Destructor */
+    ~OffsetMemoryPool();
+    /** Prevent instances of this class to be copy constructed */
+    OffsetMemoryPool(const OffsetMemoryPool &) = delete;
+    /** Prevent instances of this class to be copy assigned */
+    OffsetMemoryPool &operator=(const OffsetMemoryPool &) = delete;
+    /** Allow instances of this class to be move constructed */
+    OffsetMemoryPool(OffsetMemoryPool &&) = default;
+    /** Allow instances of this class to be move assigned */
+    OffsetMemoryPool &operator=(OffsetMemoryPool &&) = default;
+
+    // Inherited methods overridden:
+    void acquire(MemoryMappings &handles) override;
+    void release(MemoryMappings &handles) override;
+    MappingType                  mapping_type() const override;
+    std::unique_ptr<IMemoryPool> duplicate() override;
+
+private:
+    IAllocator *_allocator; /**< Allocator to use for internal allocation */
+    void       *_blob;      /**< Memory blob */
+    size_t      _blob_size; /**< Sizes of the allocated memory blob */
+};
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_OFFSETMEMORYPOOL_H__ */
diff --git a/src/runtime/BlobLifetimeManager.cpp b/src/runtime/BlobLifetimeManager.cpp
index 69292b9319..3ca5071d91 100644
--- a/src/runtime/BlobLifetimeManager.cpp
+++ b/src/runtime/BlobLifetimeManager.cpp
@@ -37,77 +37,16 @@
 using namespace arm_compute;
 
 BlobLifetimeManager::BlobLifetimeManager()
-    : _active_group(nullptr), _active_elements(), _finalized_groups(), _blobs()
+    : _blobs()
 {
 }
 
-void BlobLifetimeManager::register_group(IMemoryGroup *group)
-{
-    if(_active_group == nullptr)
-    {
-        ARM_COMPUTE_ERROR_ON(group == nullptr);
-        _active_group = group;
-    }
-}
-
-void BlobLifetimeManager::start_lifetime(void *obj)
-{
-    ARM_COMPUTE_ERROR_ON(obj == nullptr);
-    ARM_COMPUTE_ERROR_ON_MSG(std::find_if(std::begin(_active_elements), std::end(_active_elements), [&obj](const Element & e)
-    {
-        return obj == e.id;
-    }) != std::end(_active_elements),
-    "Memory object is already registered!");
-
-    // Insert object in groups and mark its finalized state to false
-    _active_elements.emplace_back(obj);
-}
-
-void BlobLifetimeManager::end_lifetime(void *obj, void **handle, size_t size)
-{
-    ARM_COMPUTE_ERROR_ON(obj == nullptr);
-
-    // Find object
-    auto it = std::find_if(std::begin(_active_elements), std::end(_active_elements), [&obj](const Element & e)
-    {
-        return obj == e.id;
-    });
-    ARM_COMPUTE_ERROR_ON(it == std::end(_active_elements));
-
-    // Update object fields and mark object as complete
-    it->handle = handle;
-    it->size   = size;
-    it->status = true;
-
-    // Check if all object are finalized and reset active group
-    if(are_all_finalized())
-    {
-        // Update finalized groups
-        _finalized_groups[_active_group].insert(std::end(_finalized_groups[_active_group]), std::begin(_active_elements), std::end(_active_elements));
-
-        // Update blobs and group mappings
-        update_blobs_and_mappings();
-
-        // Reset state
-        _active_elements.clear();
-        _active_group = nullptr;
-    }
-}
-
 std::unique_ptr<IMemoryPool> BlobLifetimeManager::create_pool(IAllocator *allocator)
 {
     ARM_COMPUTE_ERROR_ON(allocator == nullptr);
     return support::cpp14::make_unique<BlobMemoryPool>(allocator, _blobs);
 }
 
-bool BlobLifetimeManager::are_all_finalized() const
-{
-    return !std::any_of(std::begin(_active_elements), std::end(_active_elements), [](const Element e)
-    {
-        return !e.status;
-    });
-}
-
 MappingType BlobLifetimeManager::mapping_type() const
 {
     return MappingType::BLOBS;
@@ -118,7 +57,7 @@ void BlobLifetimeManager::update_blobs_and_mappings()
     ARM_COMPUTE_ERROR_ON(!are_all_finalized());
     ARM_COMPUTE_ERROR_ON(_active_group == nullptr);
 
-    // Sort active group requirements in descending order
+    // Sort active group requirements in descending order.
     std::sort(std::begin(_active_elements), std::end(_active_elements), [](const Element & a, const Element & b)
     {
         return a.size > b.size;
diff --git a/src/runtime/ISimpleLifetimeManager.cpp b/src/runtime/ISimpleLifetimeManager.cpp
new file mode 100644
index 0000000000..2c64475b39
--- /dev/null
+++ b/src/runtime/ISimpleLifetimeManager.cpp
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "arm_compute/runtime/ISimpleLifetimeManager.h"
+
+#include "arm_compute/core/Error.h"
+#include "arm_compute/runtime/IAllocator.h"
+#include "arm_compute/runtime/IMemoryGroup.h"
+#include "arm_compute/runtime/IMemoryPool.h"
+#include "support/ToolchainSupport.h"
+
+#include <algorithm>
+#include <cmath>
+#include <map>
+#include <vector>
+
+using namespace arm_compute;
+
+ISimpleLifetimeManager::ISimpleLifetimeManager()
+    : _active_group(nullptr), _active_elements(), _finalized_groups()
+{
+}
+
+void ISimpleLifetimeManager::register_group(IMemoryGroup *group)
+{
+    if(_active_group == nullptr)
+    {
+        ARM_COMPUTE_ERROR_ON(group == nullptr);
+        _active_group = group;
+    }
+}
+
+void ISimpleLifetimeManager::start_lifetime(void *obj)
+{
+    ARM_COMPUTE_ERROR_ON(obj == nullptr);
+    ARM_COMPUTE_ERROR_ON_MSG(std::find_if(std::begin(_active_elements), std::end(_active_elements), [&obj](const Element & e)
+    {
+        return obj == e.id;
+    }) != std::end(_active_elements),
+    "Memory object is already registered!");
+
+    // Insert object in groups and mark its finalized state to false
+    _active_elements.emplace_back(obj);
+}
+
+void ISimpleLifetimeManager::end_lifetime(void *obj, void **handle, size_t size)
+{
+    ARM_COMPUTE_ERROR_ON(obj == nullptr);
+
+    // Find object
+    auto it = std::find_if(std::begin(_active_elements), std::end(_active_elements), [&obj](const Element & e)
+    {
+        return obj == e.id;
+    });
+    ARM_COMPUTE_ERROR_ON(it == std::end(_active_elements));
+
+    // Update object fields and mark object as complete
+    it->handle = handle;
+    it->size   = size;
+    it->status = true;
+
+    // Check if all object are finalized and reset active group
+    if(are_all_finalized())
+    {
+        // Update finalized groups
+        _finalized_groups[_active_group].insert(std::end(_finalized_groups[_active_group]), std::begin(_active_elements), std::end(_active_elements));
+
+        // Update blobs and group mappings
+        update_blobs_and_mappings();
+
+        // Reset state
+        _active_elements.clear();
+        _active_group = nullptr;
+    }
+}
+
+bool ISimpleLifetimeManager::are_all_finalized() const
+{
+    return !std::any_of(std::begin(_active_elements), std::end(_active_elements), [](const Element e)
+    {
+        return !e.status;
+    });
+}
diff --git a/src/runtime/OffsetLifetimeManager.cpp b/src/runtime/OffsetLifetimeManager.cpp
new file mode 100644
index 0000000000..4540aeab28
--- /dev/null
+++ b/src/runtime/OffsetLifetimeManager.cpp
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "arm_compute/runtime/OffsetLifetimeManager.h"
+
+#include "arm_compute/core/Error.h"
+#include "arm_compute/runtime/IAllocator.h"
+#include "arm_compute/runtime/IMemoryGroup.h"
+#include "arm_compute/runtime/OffsetMemoryPool.h"
+#include "support/ToolchainSupport.h"
+
+#include <algorithm>
+#include <cmath>
+#include <map>
+#include <vector>
+
+using namespace arm_compute;
+
+OffsetLifetimeManager::OffsetLifetimeManager()
+    : _blob(0)
+{
+}
+
+std::unique_ptr<IMemoryPool> OffsetLifetimeManager::create_pool(IAllocator *allocator)
+{
+    ARM_COMPUTE_ERROR_ON(allocator == nullptr);
+    return support::cpp14::make_unique<OffsetMemoryPool>(allocator, _blob);
+}
+
+MappingType OffsetLifetimeManager::mapping_type() const
+{
+    return MappingType::OFFSETS;
+}
+
+void OffsetLifetimeManager::update_blobs_and_mappings()
+{
+    ARM_COMPUTE_ERROR_ON(!are_all_finalized());
+    ARM_COMPUTE_ERROR_ON(_active_group == nullptr);
+
+    // Update blob size
+    size_t max_group_size = std::accumulate(std::begin(_active_elements), std::end(_active_elements), static_cast<size_t>(0), [](size_t s, const Element & e)
+    {
+        return s + e.size;
+    });
+    _blob = std::max(_blob, max_group_size);
+
+    // Calculate group mappings
+    auto &group_mappings = _active_group->mappings();
+    size_t offset         = 0;
+    for(auto &e : _active_elements)
+    {
+        group_mappings[e.handle] = offset;
+        offset += e.size;
+        ARM_COMPUTE_ERROR_ON(offset > _blob);
+    }
+}
diff --git a/src/runtime/OffsetMemoryPool.cpp b/src/runtime/OffsetMemoryPool.cpp
new file mode 100644
index 0000000000..96f54f890f
--- /dev/null
+++ b/src/runtime/OffsetMemoryPool.cpp
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <algorithm>
+
+#include "arm_compute/runtime/OffsetMemoryPool.h"
+
+#include "arm_compute/core/Error.h"
+#include "arm_compute/runtime/IAllocator.h"
+#include "arm_compute/runtime/IMemoryPool.h"
+#include "arm_compute/runtime/Types.h"
+#include "support/ToolchainSupport.h"
+
+using namespace arm_compute;
+
+OffsetMemoryPool::OffsetMemoryPool(IAllocator *allocator, size_t blob_size)
+    : _allocator(allocator), _blob(), _blob_size(blob_size)
+{
+    ARM_COMPUTE_ERROR_ON(!allocator);
+    _blob = _allocator->allocate(_blob_size, 0);
+}
+
+OffsetMemoryPool::~OffsetMemoryPool()
+{
+    ARM_COMPUTE_ERROR_ON(!_allocator);
+    _allocator->free(_blob);
+    _blob = nullptr;
+}
+
+void OffsetMemoryPool::acquire(MemoryMappings &handles)
+{
+    ARM_COMPUTE_ERROR_ON(_blob == nullptr);
+
+    // Set memory to handlers
+    for(auto &handle : handles)
+    {
+        ARM_COMPUTE_ERROR_ON(handle.first == nullptr);
+        *handle.first = reinterpret_cast<uint8_t *>(_blob) + handle.second;
+    }
+}
+
+void OffsetMemoryPool::release(MemoryMappings &handles)
+{
+    for(auto &handle : handles)
+    {
+        ARM_COMPUTE_ERROR_ON(handle.first == nullptr);
+        *handle.first = nullptr;
+    }
+}
+
+MappingType OffsetMemoryPool::mapping_type() const
+{
+    return MappingType::OFFSETS;
+}
+
+std::unique_ptr<IMemoryPool> OffsetMemoryPool::duplicate()
+{
+    ARM_COMPUTE_ERROR_ON(!_allocator);
+    return support::cpp14::make_unique<OffsetMemoryPool>(_allocator, _blob_size);
+}
\ No newline at end of file