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From: Steven Rostedt <rostedt@goodmis.org>
To: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>,
	Shuah Khan <skhan@linuxfoundation.org>,
	linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
	Randy Dunlap <rdunlap@infradead.org>,
	Ingo Molnar <mingo@kernel.org>,
	linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v3 0/8] tracing/boot: Add new options for tracing specific period
Date: Thu, 10 Sep 2020 19:34:33 -0400	[thread overview]
Message-ID: <20200910193433.236cf081@oasis.local.home> (raw)
In-Reply-To: <159972809455.428528.4737752126800169128.stgit@devnote2>

On Thu, 10 Sep 2020 17:54:54 +0900
Masami Hiramatsu <mhiramat@kernel.org> 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

  parent reply	other threads:[~2020-09-10 23:34 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-10  8:54 [PATCH v3 0/8] tracing/boot: Add new options for tracing specific period Masami Hiramatsu
2020-09-10  8:55 ` [PATCH v3 1/8] kprobes: tracing/kprobes: Fix to kill kprobes on initmem after boot Masami Hiramatsu
2020-09-10  8:55 ` [PATCH v3 2/8] tracing/boot: Add per-instance tracing_on option support Masami Hiramatsu
2020-09-10  8:55 ` [PATCH v3 3/8] Documentation: tracing: Add tracing_on option to boot-time tracer Masami Hiramatsu
2020-09-10 13:26   ` Bird, Tim
2020-09-10 22:41     ` Masami Hiramatsu
2020-09-11  0:47       ` [PATCH v3.1 " Masami Hiramatsu
2020-09-10  8:55 ` [PATCH v3 4/8] tracing/kprobes: Support perf-style return probe Masami Hiramatsu
2020-09-10  8:55 ` [PATCH v3 5/8] tracing/uprobes: " Masami Hiramatsu
2020-09-10  8:55 ` [PATCH v3 6/8] Documentation: tracing: Add %return suffix description Masami Hiramatsu
2020-09-10  8:56 ` [PATCH v3 7/8] Documentation: tracing: boot: Add an example of tracing function-calls Masami Hiramatsu
2020-09-10  8:56 ` [PATCH v3 8/8] selftests/ftrace: Add %return suffix tests Masami Hiramatsu
2020-09-10 23:34 ` Steven Rostedt [this message]
2020-09-11  1:27   ` [PATCH v3 0/8] tracing/boot: Add new options for tracing specific period Masami Hiramatsu
2020-09-11  1:34     ` Shuah Khan

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