On 07/27/2016 08:23 AM, Steven Rostedt wrote: >> > + >> > + trace_mm_slowpath_end(page); >> > + > I'm thinking you only need one tracepoint, and use function_graph > tracer for the length of the function call. > > # cd /sys/kernel/debug/tracing > # echo __alloc_pages_nodemask > set_ftrace_filter > # echo function_graph > current_tracer > # echo 1 > events/kmem/trace_mm_slowpath/enable I hesitate to endorse using the function_graph tracer for this kind of stuff. Tracepoints offer some level of stability in naming, and the compiler won't ever make them go away. While __alloc_pages_nodemask is probably more stable than most things, there's no guarantee that it will be there. BTW, what's the overhead of the function graph tracer if the filter is set up to be really restrictive like above? Is the overhead really just limited to that one function? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>