linux-kernel - Re: [PATCH v2 -tip 3/4] tracing: make a snapshot feature available from userspace

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Date:	Mon, 17 Dec 2012 19:50:01 +0900
From:	Hiraku Toyooka <hiraku.toyooka.gu@...achi.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	yrl.pp-manager.tt@...achi.com, linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
	Li Zefan <lizf@...fujitsu.com>
Subject: Re: [PATCH v2 -tip 3/4] tracing: make a snapshot feature available
 from userspace

(12/15/2012 02:08 AM), Steven Rostedt wrote:
> On Fri, 2012-12-07 at 11:07 +0900, Hiraku Toyooka wrote:
>> Hi, Steven,
>>
>> (2012/11/30 23:17), Steven Rostedt wrote:
>> [snip]
>>   >
>>   > Actually, I would have:
>>   >
>>   >   status\input |     0      |     1      |    else    |
>>   >  --------------+------------+------------+------------+
>>   >  not allocated |(do nothing)| alloc+swap |   EINVAL   |
>>   >  --------------+------------+------------+------------+
>>   >    allocated   |    free    |   swap     |   clear    |
>>   >  --------------+------------+------------+------------+
>>   >
>>   > Perhaps we don't need to do the clear on swap, just let the trace
>>   > continue where it left off? But in case we should swap...
>>   >
>>
>> I think we don't need the clear on swap too.
>> I'll update my patches like this table.
>>
>>   > There's a fast way to clear the tracer. Look at what the wakeup tracer
>>   > does. We can make that generic. If you want, I can write that code up
>>   > too. Hmm, maybe I'll do that, as it will speed things up for
>>   > everyone :-)
>>   >
>>
>
> BTW, any update on this? I really like to get this into 3.9.
>

I'm applying your review comment and rebasing now. So, I'll post the
updated patch series in a few days.

Thanks,
Hiraku Toyooka

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