COMPMID-1626: Fixed VGG 16/19 bad_alloc failure.

Some systems don't have enough memory to run the VGG networks, for example
on systems with only 2GB memory the VGG example fails throwing a bad_alloc exception.

This patch introduces the concept of global memory policy in ACL, the policy
is a mechanism which could be used by the library's functions to try to reduce
memory consumption on systems with limited memory.

In this specific case the VGG examples set the policy to MINIMIZE. The GEMM
function checks if the policy is MINIMIZE and in this case does not use the
pretransposed weights path as this requires considerable more memory.

Change-Id: I53abc3c9c64d045d8306793ffc9d24b28e228b7b

1 files changed, 111 insertions, 0 deletions

diff --git a/src/runtime/MEMUtils.cpp b/src/runtime/MEMUtils.cpp
new file mode 100644
index 0000000000..ad00070935
--- /dev/null
+++ b/src/runtime/MEMUtils.cpp
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2018 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/core/CPP/CPPTypes.h"
+#include "arm_compute/core/Error.h"
+#include "support/ToolchainSupport.h"
+
+#ifndef BARE_METAL
+#include <fstream>
+#include <regex>
+#include <sstream>
+#endif // ifndef BARE_METAL
+
+namespace
+{
+void parse_mem_info(size_t &total, size_t &free, size_t &buffer)
+{
+    free   = 0;
+    total  = 0;
+    buffer = 0;
+#ifndef BARE_METAL
+    size_t        memcache = 0;
+    size_t        memfree  = 0;
+    std::ifstream meminfo_f;
+    meminfo_f.open("/proc/meminfo", std::ios::in);
+    if(meminfo_f.is_open())
+    {
+        std::stringstream str_stream;
+        str_stream << meminfo_f.rdbuf();
+        const std::string str = str_stream.str();
+        try
+        {
+            std::smatch match;
+            if(std::regex_search(str, match, std::regex("MemTotal: (.*)kB")) && match.size() > 1)
+            {
+                const std::string result = match.str(1);
+                total                    = std::stoul(result, nullptr, 0);
+            }
+            if(std::regex_search(str, match, std::regex("MemFree: (.*)kB")) && match.size() > 1)
+            {
+                const std::string result = match.str(1);
+                memfree                  = std::stoul(result, nullptr, 0);
+            }
+            if(std::regex_search(str, match, std::regex("Buffers: (.*)kB")) && match.size() > 1)
+            {
+                const std::string result = match.str(1);
+                buffer                   = std::stoul(result, nullptr, 0);
+            }
+            if(std::regex_search(str, match, std::regex("Cached: (.*)kB")) && match.size() > 1)
+            {
+                const std::string result = match.str(1);
+                memcache                 = std::stoul(result, nullptr, 0);
+            }
+            free = memfree + (buffer + memcache);
+        }
+        catch(std::regex_error &e)
+        {
+            // failed parsing /proc/meminfo
+            // return 0s on all fields
+        }
+    }
+#endif // ifndef BARE_METAL
+}
+
+} // namespace
+
+namespace arm_compute
+{
+void MEMInfo::set_policy(MemoryPolicy policy)
+{
+    _policy = policy;
+}
+
+MemoryPolicy MEMInfo::get_policy()
+{
+    return _policy;
+}
+MemoryPolicy MEMInfo::_policy = { MemoryPolicy::NORMAL };
+
+MEMInfo::MEMInfo()
+    : _total(0), _free(0), _buffer(0)
+{
+    parse_mem_info(_total, _free, _buffer);
+}
+
+size_t MEMInfo::get_total_in_kb() const
+{
+    return _total;
+}
+
+} // namespace arm_compute