linux-kernel - Re: [RFC] [PATCH 0/2] x86: make jump labels use int3-based breakpoint instead of stop

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Message-ID: <51DE16C1.4030403@hitachi.com>
Date:	Thu, 11 Jul 2013 11:21:53 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Jason Baron <jbaron@...hat.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] [PATCH 0/2] x86: make jump labels use int3-based breakpoint
 instead of stop_machine()

(2013/07/11 5:25), Jiri Kosina wrote:
> Hi,
> 
> this is a resurrection of a few years old idea to have jump labels use 
> synchronization based on int3 breakpoint rather than relying on 
> stop_machine() with all the consequences.
> 
> ftrace has been doing exactly this kind of patching for year since 
> 08d636b6 ("ftrace/x86: Have arch x86_64 use breakpoints instead of stop 
> machine").
> 
> This patchset first introduces generic text_poke_bp() that provides means 
> to perform this method of patching in parallel to text_poke_smp(), and 
> then converts x86 jump label code to use it.
> 
> If this is merged, I'll do a followup patch converting ftrace to use this 
> infrastructure as well, as it's doing the same thing in principle already.

Hi Jiri,

Thank you for taking over it! :)
If yours is merged, I can move optprobe on that too ;)

Thank you again!!

-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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