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

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Date:	Fri, 14 Dec 2012 12:08:33 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Hiraku Toyooka <hiraku.toyooka.gu@...achi.com>
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

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.

Thanks!

-- Steve


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