linux-kernel - Re: [PATCH v4] trace,x86: add x86 irq vector tracepoints

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Message-ID: <50612729.2080307@zytor.com>
Date:	Mon, 24 Sep 2012 20:38:17 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Seiji Aguchi <seiji.aguchi@....com>
CC:	"Thomas Gleixner (tglx@...utronix.de)" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"'mingo@...e.hu' (mingo@...e.hu)" <mingo@...e.hu>,
	"x86@...nel.org" <x86@...nel.org>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Satoru Moriya <satoru.moriya@....com>
Subject: Re: [PATCH v4] trace,x86: add x86 irq vector tracepoints

On 09/21/2012 05:40 PM, Seiji Aguchi wrote:
>
>     Those x86 specific ones are not really frequently raised vectors, so
>     enabling them all won't affect performance and readability of the
>     traces too much.
>

... except the cost can be reduced to zero *AND* be made into a more 
general mechanism by simply hooking the IDT.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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