Dynamic library profiling method and dynamic library profiling system

A dynamic library profiling system comprising:

• a performance measurement unit (PMU) counter that records PMU count values that are cumulative values of events occurring in a processor core;
• a task struct allocated by an operating system (OS) kernel in which process PMU counts that are the cumulative PMU count values recorded while the target process is executed are recorded for each target process, wherein the task struct is an internal data structure of the OS kernel;
• and
• a monitoring process that writes a first break point instruction at a start address of a dynamic library function indicated by calling a procedure linkage table (PLT) corresponding to the dynamic library function, the PLT referencing a global offset table (GOT) storing the start address of the dynamic library function, and to write a second break point instruction at a return address of the dynamic library function, after the dynamic library function is loaded at run time of the target process,
• wherein the monitoring process records a first event count value that is the process PMU count when the target process executes the first break point instruction, records a second event count value that is the process PMU count when the target process executes the second break point instruction, and calculates PMU counts generated in the processor core while the dynamic library function is executed, by comparing the first event count value with the second event count value, and
• wherein the task struct is allocated to the target process for storing the PMU count values generated exclusively while the target process is executed and the process PMU count is not comprised a process PMU count of other processes different from the target process when a context switch occurs in time sharing system,
• wherein the OS kernel records a cumulative PMU count of the PMU counts recorded while the target process is executed on a task struct corresponding to the target process,
• wherein the process PMU counts recorded in the task struct are stored in resource usage statistics of the target process, and the monitoring process extracts the first event count value and the second event count value from the resource usage statistics.