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

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Message-ID: <5C4C569E8A4B9B42A84A977CF070A35B2C57F7A90D@USINDEVS01.corp.hds.com>
Date:	Wed, 14 Dec 2011 21:23:49 -0500
From:	Seiji Aguchi <seiji.aguchi@....com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Frederic Weisbecker <fweisbec@...il.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

Steven,

Thank you for giving me an explanation in detail how stacktrace works.
I was confused stacktrace.

>> Rip in local timer interrupt is more accurate information
>> for achieving my goal than stacktrace
>
>Does the above change your mind?

I'm concerned about amount of consumption of ring buffer because
I would like to use a background tracer for multiple cases in our costomer's system
for solving several issues.

As you know, I'm trying to improve tracepoints of signal events with others.
  https://lkml.org/lkml/2011/11/30/223

And I'm posting a patch of jbd2 event by myself.
  https://lkml.org/lkml/2011/11/29/328

How much does stacktrace consume ring buffer, compared to a tracepoint?

Seiji

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