linux-kernel - Re: ftraced and suspend to ram

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Message-ID: <alpine.DEB.1.10.0808221632410.14231@gandalf.stny.rr.com>
Date:	Fri, 22 Aug 2008 16:33:59 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Pavel Machek <pavel@...e.cz>
cc:	Marcin Slusarz <marcin.slusarz@...il.com>,
	Ingo Molnar <mingo@...e.hu>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: ftraced and suspend to ram


On Fri, 22 Aug 2008, Pavel Machek wrote:
> 
> Does ftrace hook itself onto _all_ the functions? Or all .c functions?

It hooks into all .c functions that are not annotated with "notrace"
or the files have not been marked in the Makefile like:

  CFLAGS_REMOVE_<file>.o = -pg


> 
> I guess low-level suspend code needs to be exempt from
> tracing. Certainly all the assembly functions.

I'm looking into that now too. Are the functions in arch/x86/power/cpu*.c 
the suspend to ram code?

Thanks,

-- Steve

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