linux-kernel - Re: [lttng-dev] [PATCH 09/11] sched: export task

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Date:	Tue, 20 Dec 2011 13:46:31 -0800
From:	Frank Rowand <frank.rowand@...sony.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Greg KH <greg@...ah.com>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lttng-dev@...ts.lttng.org" <lttng-dev@...ts.lttng.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [lttng-dev] [PATCH 09/11] sched: export task_prio to GPL modules

On 12/20/11 03:08, Ingo Molnar wrote:
> 
> (Cc:-ing Arnaldo on this as well.)
> 
> * Mathieu Desnoyers <compudj@...stal.dyndns.org> wrote:
> 

< snip >

> I think your concentration on ABIs is missing a very fundamental 
> property of instrumentation:
> 
>   the life-time and persistence of instrumentation data is 
>   typically very short ('days' is already an exception - typical 
>   is minutes, at most hours), and for that reason we havent been 
>   getting much pressure from users to maintain a perf.data ABI - 
>   but we are doing it nevertheless.
> 
> Instrumentation is fundamentally about the 'here and now' and so 
> it fundamentally differs from things like backup formats and 
> database formats. An ABI does not hurt and we are maintaining 
> it, but you are overrating its importance significantly.

Just to provide visibility to a different use case...

The life time of my data is typically weeks, months, or years
(though I am not likely to re-process year old raw data).

< snip >

-Frank

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