linux-kernel - Re: [PATCH 14/23 -v8] Add tracing of context switches

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Message-ID: <47A89704.9000504@am.sony.com>
Date:	Tue, 05 Feb 2008 09:04:04 -0800
From:	Tim Bird <tim.bird@...sony.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Hellwig <hch@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Gregory Haskins <ghaskins@...ell.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sam Ravnborg <sam@...nborg.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	John Stultz <johnstul@...ibm.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 14/23 -v8] Add tracing of context switches

Steven Rostedt wrote:
> Index: linux-mcount.git/lib/tracing/Kconfig
> ===================================================================
> --- linux-mcount.git.orig/lib/tracing/Kconfig	2008-01-30 15:18:18.000000000 -0500
> +++ linux-mcount.git/lib/tracing/Kconfig	2008-01-30 15:32:33.000000000 -0500
> @@ -23,3 +23,12 @@ config FUNCTION_TRACER
>  	  insert a call to an architecture specific __mcount routine,
>  	  that the debugging mechanism using this facility will hook by
>  	  providing a set of inline routines.
> +
> +config CONTEXT_SWITCH_TRACER
> +	bool "Trace process context switches"
> +	depends on DEBUG_KERNEL
> +	select TRACING
> +	help
> +	  This tracer hooks into the context switch and records
> +	  all switching of tasks.
> +

This needs a "select MARKERS" or it doesn't compile.

My config has:

CONFIG_TRACE_IRQFLAGS_SUPPORT=y
CONFIG_TRACE_IRQFLAGS=y
CONFIG_TRACER_MAX_TRACE=y
CONFIG_FUNCTION_TRACER=y
# CONFIG_EVENT_TRACER is not set
# CONFIG_WAKEUP_TRACER is not set
CONFIG_CONTEXT_SWITCH_TRACER=y

   -- Tim

=============================
Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Corporation of America
=============================

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