Hi, I would like to trace some function of the cpu hotplug feature on an Arm platform with ftrace in order to get the time spent in the different steps. I have tried to use the function/function_graph tracer with set_ftrace_filter but some function like _cpu_down are not in the available_filter_functions list. Is it possible to have _cpu_down in the list ? Do I need to enable some kernel configuration ? I have added part of my config below
CONFIG_TRACEPOINTS=y CONFIG_STACKTRACE=y CONFIG_NOP_TRACER=y CONFIG_HAVE_FUNCTION_TRACER=y CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y CONFIG_HAVE_DYNAMIC_FTRACE=y CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y CONFIG_CONTEXT_SWITCH_TRACER=y CONFIG_GENERIC_TRACER=y CONFIG_FTRACE=y CONFIG_FUNCTION_TRACER=y CONFIG_FUNCTION_GRAPH_TRACER=y # CONFIG_IRQSOFF_TRACER is not set # CONFIG_PREEMPT_TRACER is not set # CONFIG_SCHED_TRACER is not set # CONFIG_STACK_TRACER is not set # CONFIG_BLK_DEV_IO_TRACE is not set CONFIG_DYNAMIC_FTRACE=y CONFIG_FTRACE_MCOUNT_RECORD=y # CONFIG_FTRACE_STARTUP_TEST is not set CONFIG_DEBUG_INFO=y # CONFIG_DEBUG_INFO_REDUCED is not set Thanks, Vincent -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
