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Date:	Thu, 07 Aug 2014 13:53:26 +0900
From:	Masami Hiramatsu <>
To:	Steven Rostedt <>
Cc:	Tom Zanussi <>,
	Yoshihiro YUNOMAE <>,
	Oleg Nesterov <>,
	Namhyung Kim <>,
	Ingo Molnar <>,
	Linux Kernel Mailing List <>,
	"Paul E. McKenney" <>
Subject: Re: [RFC PATCH 0/3] ftrace: Add a ftrace test collection

(2014/08/06 6:37), Steven Rostedt wrote:
> Hi Masami,
> This looks great. I'm a bit busy at the moment (just came back from
> vacation, and digging myself out of the hole that left me). But I
> definitely want this in. I have a bunch of tests too, that I can put on
> top of this. My tests are rather hacky, and hard code a lot of stuff in
> them, but they do test a bunch of features of ftrace. It shouldn't be
> too hard to include them here.

Thanks! and I found some ftrace testcases in LTP,

Most of them are for stress test, but basic ideas are good for
unit test. And IMHO, ftrace unit test should be within the kernel

> On Tue, 05 Aug 2014 02:45:44 +0000
> Masami Hiramatsu <> wrote:
>> Hi,
>> I'd like to introduce a collection of testcases for ftrace to
>> avoid regressions.
>> For a long time, we've tried to stabilize and extend ftrace
>> tracing infrastructure. This small test framework is a kind of
>> stabilizing work for ftrace. For the first step, this series
>> just introduces a few basic testcases. However, it is easy to
>> add additional tests. I'd like to ask you, ftrace developers,
>> to add tests for your features to ensure it will not be broken
>> by future works.
>> ftracetest is a tiny bash script so that anyone can easily
>> understand what it does. I think it is better to share and
>> discuss this tests before growing it.
>>  - Is it enough to support bash script? (of course you can
>>    invoke other commands from the script)
>>  - What's the good naming method of testcases?
>>  - Is any dependency check required?
>> BTW, I decided to put this under tools/testing/ftrace instead
>> of tools/testing/selftests/, because all tests requires root
>> privilege. It will be one of discussion points. Anyway,
>> it is easy to integrate this to the selftests.
> I agree. I think having its own directory is a good idea. Lets see what
> other people think.

Actually, current sefltests provides just a space, not minimal
functions, like log management, test statistics, etc. which ftracetest
has. And I doubt that Make-based test framework is good for providing
such functions.
I think it is also another option to generalize the ftracetest script
for selftests :)

> When I get time, I'll see if I can start a branch
> that pulls this in and start adding my own tests on top of it.

I look forward to see your tests :)

Thank you,

Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory

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