linux-kernel - Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

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Message-ID: <20060918165445.GA13702@Krystal>
Date:	Mon, 18 Sep 2006 12:54:45 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jes Sorensen <jes@....com>, Andrew Morton <akpm@...l.org>,
	tglx@...utronix.de, Paul Mundt <lethal@...ux-sh.org>,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Tom Zanussi <zanussi@...ibm.com>, ltt-dev@...fik.org,
	Michel Dagenais <michel.dagenais@...ymtl.ca>
Subject: Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

* Ingo Molnar (mingo@...e.hu) wrote:
> 
> * Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:
> 
> > You are late (I don't blame you about it, considering the size of this 
> > thread). It has been posted in the following email :
> > 
> > http://linux.derkeiler.com/Mailing-Lists/Kernel/2006-09/msg04492.html
> 
> yeah - and i dont think the kprobes overhead is a fundamental thing - i 
> posted a few kprobes-speedup patches as a reply to your measurements.
> 

Hi Ingo,

Yes, and I replied that I really don't think that a few cycles saved here and
there by a predicted branch will change anything significant compared to the
int3 cost. As my test bench is really not that hard to deploy (I have given the
precise instructions to do so), I assume that the burden of the proof is on your
side there.

Anyhow, I prefer to move to a more constructive matter than testing kprobes
branch optimisations.

Mathieu

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