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

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Date:	Wed, 26 Nov 2008 11:14:38 +0800
From:	walimis <walimisdev@...il.com>
To:	Paul Mundt <lethal@...ux-sh.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	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, Nov 26, 2008 at 12:04:46PM +0900, 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, and not needed. Because .text.head is of booting code, to which
function tracer can't trace.

walimis
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