On Thu, 10 Sep 2020 17:54:54 +0900 Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote: > Hi, > > Here is the 3rd version of the series to improve the boot-time tracing to > support kretprobe and tracing_on option. Previous version is here: > > https://lkml.kernel.org/r/159894698993.1478826.2813843560314595660.stgit@devnote2 > > This version adds uprobe %return suffix support ([5/8]) and the testcases > ([8/8]), and update kprobe %suffix support([4/8]) and the uprobe event > document([6/8]). > > > The combination of tracing_on and kretprobe allows us to trace events > while a specific function call period. For example, the below bootconfig > will make a function callgraph in the pci_proc_init() function at boot > time. > > ftrace { > tracing_on = 0 # off at start > tracer = function_graph > event.kprobes { > start_event { > probes = "pci_proc_init" > actions = "traceon" > } > end_event { > probes = "pci_proc_init%return" > actions = "traceoff" > } > } > } > > Here is the example output; > [..] Hi Masami, This looks really great! I just got back from a 10 day holiday, and I'm drowning in "catch-up". I plan on looking at all this relatively soon (in a week or two?). I just don't want you to think I'm ignoring this. -- Steve
