linux-kernel - Re: [PATCH 1/1] ftrace: adding other non-leaving .text sections

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Message-ID: <alpine.DEB.1.10.0811252220230.26424@gandalf.stny.rr.com>
Date:	Tue, 25 Nov 2008 22:20:45 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Paul Mundt <lethal@...ux-sh.org>
cc:	Liming Wang <liming.wang@...driver.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ftrace: adding other non-leaving .text sections


On Wed, 26 Nov 2008, Paul Mundt wrote:

> On Tue, Nov 25, 2008 at 10:03:35PM -0500, Steven Rostedt wrote:
> > 
> > On Wed, 26 Nov 2008, Liming Wang wrote:
> > 
> > > Please review this patch, and I don't know whether new sections will conflict 
> > > with sched tracer or others. 
> > > This patch is against Steven tree's tip/devel latest commit.
> > > 
> > > Impact: improve recordmcount.pl
> > > 
> > > Besides .text section, there are three .text sections that won't
> > > be freed after kernel booting. They are: .sched.text, .spinlock.text
> > > and .kprobes.text, which contain functions we can trace. But the last
> > > section ".kprobes.text" is particular, which has been marked as "notrace",
> > > we ignore it. Thus we add other two sections.
> > 
> > Yep, only those sections that we know will not disappear are OK. I was
> > conservative with only using ".text" but I knew there were other sections 
> > that were OK, so I used the hash array to make it easy to add others.
> > 
> Does your .text cover .text.head by the way?

No, you can add it if it is safe to trace, and it will not ever disappear.

-- Steve

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