linux-kernel - Re: [RFC][ PATCH -tip v2 0/7] kprobes: Kprobes jump optimization support

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Date:	Tue, 23 Jun 2009 16:48:29 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Anders Kaseorg <andersk@...lice.com>,
	Tim Abbott <tabbott@...lice.com>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>
Subject: Re: [RFC][ PATCH -tip v2 0/7] kprobes: Kprobes jump optimization
 support

Andi Kleen wrote:
> On Tue, Jun 23, 2009 at 01:28:03PM -0400, Masami Hiramatsu wrote:
>> Hmm, would you know what is the actual name of that section and option?
> 
> -freorder-blocks-and-partition
> 
> .text.unlikely

Thanks,

> 
>> I think another possible solution is decoding those sections and
>> black-listing the target functions when making vmlinux or loading
>> modules.
> 
> Note that this can be pretty much all functions if you're unlucky.

Sure, in that case, I have two options;
- Disable above option by kconfig.
- Black-listing the target addresses, instead of functions.

Thank you,

> 
> -Andi
> 

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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