linux-kernel - RE: [PATCH 2/2] trace,x86: Add x86 irq vector entry/exit tracepoints

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Message-ID: <5C4C569E8A4B9B42A84A977CF070A35B2C57F7A805@USINDEVS01.corp.hds.com>
Date:	Wed, 14 Dec 2011 12:46:21 -0500
From:	Seiji Aguchi <seiji.aguchi@....com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Vaibhav Nagarnaik <vnagarnaik@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	Michael Rubin <mrubin@...gle.com>,
	David Sharp <dhsharp@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	Satoru Moriya <satoru.moriya@....com>
Subject: RE: [PATCH 2/2] trace,x86: Add x86 irq vector entry/exit tracepoints

>Well ftrace is a whole subsystem that includes the function tracer and also an interface
>for tracepoints in debugfs. I was rather suggesting the latter one. This is a good
>choice for background tracing. And it supports stacktraces. If those generate too much
>overhead perhaps you can tune the number of entries in the stacktrace, I don't remember
>if we can do that currently but this can be an interesting feature.

I would like to periodically check which function call is executed
rather than seeing stacktrace.

AFAIK, purpose of stack tracing is showing where the biggest use of the stack takes place.
I don't think stack tracing achieves my goal.

Rip in local timer interrupt is more accurate information 
for achieving my goal than stacktrace

>
>What are you using currently for the background tracing?

Currently, we are using SystemTap in customer's system.
So, I would like to use this tracepoint with SystemTap.

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