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

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Message-ID: <1323880637.23971.34.camel@gandalf.stny.rr.com>
Date:	Wed, 14 Dec 2011 11:37:17 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Seiji Aguchi <seiji.aguchi@....com>,
	Vaibhav Nagarnaik <vnagarnaik@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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

On Wed, 2011-12-14 at 17:34 +0100, Frederic Weisbecker wrote:

> Well ftrace is a whole subsystem that includes the function tracer and also an interface
> for tracepoints in debugfs. 

Confusing isn't it ;)

> 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.

That would probably be trivial to add, especially now that we allow
pretty much a full stack trace anyway.

-- Steve



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