library/cpp/lwtrace/perf.h


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#pragma once 
 
#include <util/system/types.h> 
#include <util/thread/singleton.h> 
 
namespace NLWTrace { 
    struct TProbe; 
 
    class TCpuTracker { 
    private: 
        const ui64 MinReportPeriod; 
 
        // State 
        bool Reporting = false; 
        ui64 LastTs = 0; 
        ui64 LastReportTs = 0; 
 
        // Statistics 
        ui64 MaxCycles; 
        const TProbe* MaxProbe; 
        ui64 MinCycles; 
        ui64 ProbeCycles; 
        ui64 Count; 
 
    public: 
        TCpuTracker(); 
        void Enter(); 
        void Exit(const TProbe* Probe); 
        static TCpuTracker* TlsInstance() { 
            struct TCpuTrackerkHolder { 
                TCpuTracker Tracker; 
            }; 
            return &FastTlsSingletonWithPriority<TCpuTrackerkHolder, 4>()->Tracker; 
        } 
 
    private: 
        void AddStats(const TProbe* probe, ui64 cycles); 
        void ResetStats(); 
        void Report(); 
        void ReportNotReentrant(); 
        static double MilliSeconds(ui64 cycles); 
    }; 
 
    class TScopedThreadCpuTracker { 
    private: 
        const TProbe* Probe; 
        TCpuTracker* Tracker; 
 
    public: 
        template <class T> 
        explicit TScopedThreadCpuTracker(const T& probe) 
            : Probe(&probe.Probe) 
            , Tracker(TCpuTracker::TlsInstance()) 
        { 
            Tracker->Enter(); 
        } 
 
        ~TScopedThreadCpuTracker() { 
            Tracker->Exit(Probe); 
        } 
    }; 
 
}