function_trace's Introduction
This project maintains patch used to trace function call. There are two methods to get function call flow. 1. use main.py which traverse all source code and add enter and exit function in each C routines. 2. Use compile option -finstrument-functions, compiler will help ingerate provided enter and exit APIs into final binary. The caller and callee can be print once it's enabled. For cnss patch, introduce a common file for profile function, since module name can't be same with source file if there are multiple source files, so rename some files. cnss_nl.c --> cnss_n.c cnss_prealloc.c --> cnss_prealloc1.c cnss_utils.c --> cnss_utils1.c Todo 1. now for simple call flow, profile_fun can query and print function name directly, but once there are many calls, it will affect the performance and get CPU stuck. Next same called and caller into filesystem and use script to decode it.
function_trace's People
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