From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Steven Rostedt <rostedt@goodmis.org>,
"Frank Ch. Eigler" <fche@redhat.com>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
"H. Peter Anvin" <hpa@zytor.com>,
yrl.pp-manager.tt@hitachi.com
Subject: Re: [RFC PATCH -tip ] x86/kprobes: kprobes call optimization
Date: Fri, 11 May 2012 17:29:15 +0900 [thread overview]
Message-ID: <4FACCDDB.4080801@hitachi.com> (raw)
In-Reply-To: <20120510115401.18125.93504.stgit@localhost.localdomain>
(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@hitachi.com
next prev parent reply other threads:[~2012-05-11 8:29 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-02 19:24 [PATCH 0/9][RFC] ftrace: ftrace location lookup speedup, and clean ups Steven Rostedt
2012-05-02 19:24 ` [PATCH 1/9][RFC] ftrace: Sort all function addresses, not just per page Steven Rostedt
2012-05-02 19:24 ` [PATCH 2/9][RFC] ftrace: Remove extra helper functions Steven Rostedt
2012-05-02 19:24 ` [PATCH 3/9][RFC] ftrace: Speed up search by skipping pages by address Steven Rostedt
2012-05-02 19:24 ` [PATCH 4/9][RFC] ftrace: Consolidate ftrace_location() and ftrace_text_reserved() Steven Rostedt
2012-05-02 19:24 ` [PATCH 5/9][RFC] ftrace: Return record ip addr for ftrace_location() Steven Rostedt
2012-05-02 19:24 ` [PATCH 6/9][RFC] kprobes: Allow probe on ftrace reserved text (but move it) Steven Rostedt
2012-05-02 20:40 ` Frank Ch. Eigler
2012-05-02 23:40 ` Steven Rostedt
2012-05-07 11:37 ` Masami Hiramatsu
2012-05-07 11:59 ` Masami Hiramatsu
2012-05-07 12:44 ` Steven Rostedt
2012-05-07 12:51 ` Steven Rostedt
2012-05-07 12:43 ` Steven Rostedt
2012-05-08 3:08 ` Masami Hiramatsu
2012-05-08 13:04 ` Steven Rostedt
2012-05-09 5:53 ` Masami Hiramatsu
2012-05-09 8:12 ` Masami Hiramatsu
2012-05-09 9:02 ` Masami Hiramatsu
2012-05-09 14:50 ` Steven Rostedt
2012-05-10 11:54 ` [RFC PATCH -tip ] x86/kprobes: kprobes call optimization Masami Hiramatsu
2012-05-11 8:29 ` Masami Hiramatsu [this message]
2012-05-02 19:24 ` [PATCH 7/9][RFC] ftrace: Make ftrace_modify_all_code() global for archs to use Steven Rostedt
2012-05-02 19:24 ` [PATCH 8/9][RFC] ftrace/x86: Have x86 ftrace use the ftrace_modify_all_code() Steven Rostedt
2012-05-02 19:24 ` [PATCH 9/9][RFC] ftrace: Remove selecting FRAME_POINTER with FUNCTION_TRACER Steven Rostedt
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