linux-kernel - Re: [RFC PATCH 0/3] ftrace: Add a ftrace test collection

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Date:	Thu, 07 Aug 2014 13:53:26 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
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,

https://github.com/linux-test-project/ltp/tree/master/testcases/kernel/tracing/ftrace_stress_test/ftrace_stress

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
tree.

> 
> 
> On Tue, 05 Aug 2014 02:45:44 +0000
> Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> 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,

-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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