On Thu, 10 Sep 2020 19:34:33 -0400
Steven Rostedt [off-list ref] wrote:

On Thu, 10 Sep 2020 17:54:54 +0900
Masami Hiramatsu [off-list ref] wrote:

quoted

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.

Hi Steve,

Thanks, I hope you enjoyed the holiday!
BTW, this series includes some document update and testcases.
Since we can not decouple these updates, I think it is better you to
pull the series.

Regards,

-- 
Masami Hiramatsu [off-list ref]