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

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Message-ID: <20060917140009.GA15534@elte.hu>
Date:	Sun, 17 Sep 2006 16:00:09 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederik Deweerdt <deweerdt@...e.fr>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Jes Sorensen <jes@....com>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Andrew Morton <akpm@...l.org>, tglx@...utronix.de,
	karim@...rsys.com, 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


* Frederik Deweerdt <deweerdt@...e.fr> wrote:

> On Sat, Sep 16, 2006 at 09:37:45PM +0200, Ingo Molnar wrote:
> > --------------->
> > Subject: [patch] kprobes: speed INT3 trap handling up on i386
> > From: Ingo Molnar <mingo@...e.hu>
> > 
> > speed up kprobes trap handling by special-casing kernel-space
> > INT3 traps (which do not occur otherwise) and doing a kprobes
> > handler check - instead of redirecting over the i386-die-notifier
> > chain.
> > 
> Hi Ingo,
> 
> Not that it would make any difference to the actual kprobe 
> performance, but I think that not using the die-notifier chain makes 
> the DIE_INT3 handling in kprobe_exceptions_notify() useless.

yeah, indeed - i'll add your patch to the kprobes patchset.

	Ingo

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