ts: test tags for flexible/reliable tests filtering

- added functionality to collect memory usage of OpenCL sybsystem
- memory usage of fastMalloc() (disabled by default):
  * It is not accurate sometimes - external memory profiler is required.
- specify common `CV_TEST_TAG_` macros
- added applyTestTag() function
- write memory usage / enabled tags into Google Tests output file (.xml)

modules/core/include/opencv2/core/private.hpp

@@ -141,13 +141,20 @@ namespace cv
 {
 CV_EXPORTS void scalarToRawData(const cv::Scalar& s, void* buf, int type, int unroll_to = 0);
 
-//! Allocate all memory buffers which will not be freed, ease filtering memcheck issues
+//! Allocate memory buffers which will not be freed, ease filtering memcheck issues. Uses fastMalloc() call.
 CV_EXPORTS void* allocSingletonBuffer(size_t size);
 
-//! Allocate all memory buffers which will not be freed, ease filtering memcheck issues
+//! Allocate memory buffers which will not be freed, ease filtering memcheck issues. Uses fastMalloc() call
 template <typename T> static inline
 T* allocSingleton(size_t count = 1) { return static_cast<T*>(allocSingletonBuffer(sizeof(T) * count)); }
 
+//! Allocate memory buffers which will not be freed, ease filtering memcheck issues. Uses generic malloc() call.
+CV_EXPORTS void* allocSingletonNewBuffer(size_t size);
+
+//! Allocate memory buffers which will not be freed, ease filtering memcheck issues.  Uses generic malloc() call.
+template <typename T> static inline
+T* allocSingletonNew() { return new(allocSingletonNewBuffer(sizeof(T))) T(); }
+
 } // namespace
 
 #if 1 // TODO: Remove in OpenCV 4.x

modules/core/include/opencv2/core/utils/allocator_stats.hpp

@@ -0,0 +1,29 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+
+#ifndef OPENCV_CORE_ALLOCATOR_STATS_HPP
+#define OPENCV_CORE_ALLOCATOR_STATS_HPP
+
+#include "../cvdef.h"
+
+namespace cv { namespace utils {
+
+class AllocatorStatisticsInterface
+{
+protected:
+    AllocatorStatisticsInterface() {}
+    virtual ~AllocatorStatisticsInterface() {}
+public:
+    virtual uint64_t getCurrentUsage() const = 0;
+    virtual uint64_t getTotalUsage() const = 0;
+    virtual uint64_t getNumberOfAllocations() const = 0;
+    virtual uint64_t getPeakUsage() const = 0;
+
+    /** set peak usage = current usage */
+    virtual void resetPeakUsage() = 0;
+};
+
+}} // namespace
+
+#endif // OPENCV_CORE_ALLOCATOR_STATS_HPP

modules/core/include/opencv2/core/utils/allocator_stats.impl.hpp

@@ -0,0 +1,117 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+
+#ifndef OPENCV_CORE_ALLOCATOR_STATS_IMPL_HPP
+#define OPENCV_CORE_ALLOCATOR_STATS_IMPL_HPP
+
+#include "./allocator_stats.hpp"
+
+#ifdef CV_CXX11
+#include <atomic>
+#endif
+
+namespace cv { namespace utils {
+
+#ifdef CV__ALLOCATOR_STATS_LOG
+namespace {
+#endif
+
+class AllocatorStatistics : public AllocatorStatisticsInterface
+{
+protected:
+#ifdef CV_CXX11
+    std::atomic<long long> curr, total, total_allocs, peak;
+#else
+    volatile long long curr, total, total_allocs, peak;  // overflow is possible, CV_XADD operates with 'int' only
+#endif
+
+public:
+    AllocatorStatistics()
+#ifndef CV_CXX11
+        : curr(0), total(0), total_allocs(0), peak(0)
+#endif
+    {}
+    ~AllocatorStatistics() CV_OVERRIDE {}
+
+    // AllocatorStatisticsInterface
+
+#ifdef CV_CXX11
+    uint64_t getCurrentUsage() const CV_OVERRIDE { return (uint64_t)curr.load(); }
+    uint64_t getTotalUsage() const CV_OVERRIDE { return (uint64_t)total.load(); }
+    uint64_t getNumberOfAllocations() const CV_OVERRIDE { return (uint64_t)total_allocs.load(); }
+    uint64_t getPeakUsage() const CV_OVERRIDE { return (uint64_t)peak.load(); }
+
+    /** set peak usage = current usage */
+    void resetPeakUsage() CV_OVERRIDE { peak.store(curr.load()); }
+
+    // Controller interface
+    void onAllocate(size_t sz)
+    {
+#ifdef CV__ALLOCATOR_STATS_LOG
+        CV__ALLOCATOR_STATS_LOG(cv::format("allocate: %lld (curr=%lld)", (long long int)sz, (long long int)curr.load()));
+#endif
+
+        long long new_curr = curr.fetch_add((long long)sz) + (long long)sz;
+
+        // peak = std::max((uint64_t)peak, new_curr);
+        auto prev_peak = peak.load();
+        while (prev_peak < new_curr)
+        {
+            if (peak.compare_exchange_weak(prev_peak, new_curr))
+                break;
+        }
+        // end of peak = max(...)
+
+        total += (long long)sz;
+        total_allocs++;
+    }
+    void onFree(size_t sz)
+    {
+#ifdef CV__ALLOCATOR_STATS_LOG
+        CV__ALLOCATOR_STATS_LOG(cv::format("free: %lld (curr=%lld)", (long long int)sz, (long long int)curr.load()));
+#endif
+        curr -= (long long)sz;
+    }
+
+#else
+    uint64_t getCurrentUsage() const CV_OVERRIDE { return (uint64_t)curr; }
+    uint64_t getTotalUsage() const CV_OVERRIDE { return (uint64_t)total; }
+    uint64_t getNumberOfAllocations() const CV_OVERRIDE { return (uint64_t)total_allocs; }
+    uint64_t getPeakUsage() const CV_OVERRIDE { return (uint64_t)peak; }
+
+    void resetPeakUsage() CV_OVERRIDE { peak = curr; }
+
+    // Controller interface
+    void onAllocate(size_t sz)
+    {
+#ifdef CV__ALLOCATOR_STATS_LOG
+        CV__ALLOCATOR_STATS_LOG(cv::format("allocate: %lld (curr=%lld)", (long long int)sz, (long long int)curr));
+#endif
+
+        uint64_t new_curr = (uint64_t)CV_XADD(&curr, (uint64_t)sz) + sz;
+
+        peak = std::max((uint64_t)peak, new_curr);  // non-thread safe
+
+        //CV_XADD(&total, (uint64_t)sz);  // overflow with int, non-reliable...
+        total += sz;
+
+        CV_XADD(&total_allocs, (uint64_t)1);
+    }
+    void onFree(size_t sz)
+    {
+#ifdef CV__ALLOCATOR_STATS_LOG
+        CV__ALLOCATOR_STATS_LOG(cv::format("free: %lld (curr=%lld)", (long long int)sz, (long long int)curr));
+#endif
+        CV_XADD(&curr, (uint64_t)-sz);
+    }
+#endif
+};
+
+#ifdef CV__ALLOCATOR_STATS_LOG
+} // namespace
+#endif
+
+}} // namespace
+
+#endif // OPENCV_CORE_ALLOCATOR_STATS_IMPL_HPP