linux-kernel - Re: [PATCH 2/4] ftrace - add function

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Message-ID: <y0md42magc1.fsf@fche.csb>
Date:	Thu, 10 Dec 2009 12:28:46 -0500
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tim Bird <tim.bird@...sony.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] ftrace - add function_duration tracer

Ingo Molnar <mingo@...e.hu> writes:

> [...]
> Just off the top of my head we want to be able to trace:
>
>  - max irq service latencies for a given IRQ
>  - max block IO completion latencies for a app
>  - max TLB flush latencies in the system
>  - max sys_open() latencies in a task
>  - max fork()/exit() latencies in a workload
>  - max scheduling latencies on a given CPU
>  - max page fault latencies
>  - max wakeup latencies for a given task
>  - max memory allocation latencies
>
>  - ... and dozens and dozens of other things where there's a "start"
>    and a "stop" event and where we want to measure the time between
>    them.
> [...]

FWIW, those who want to collect such measurements today can do so with
a few lines of systemtap script for each of the above.


- FChE
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