linux-kernel - Re: [RFC PATCH -tip ] x86/kprobes: kprobes call optimization

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Message-ID: <4FACCDDB.4080801@hitachi.com>
Date:	Fri, 11 May 2012 17:29:15 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, yrl.pp-manager.tt@...achi.com
Subject: Re: [RFC PATCH -tip ] x86/kprobes: kprobes call optimization

(2012/05/10 20:54), Masami Hiramatsu wrote:
> Note: this code is still under development, but it will
> be useful for the discussion to show this.
> 
> Use relative call instead of relative jump for optimizing
> kprobes. This reduces x86-depend magic code and runtime
> memory size.

Hmm, I've found that this patch may increase the execution
time of probing more than 20%. I think that is more than
acceptable...


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