From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Frederic Weisbecker <fweisbec@gmail.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Andi Kleen <andi@firstfloor.org>,
2nddept-manager@sdl.hitachi.co.jp
Subject: Re: [RFC][PATCH 0/4] ftrace: Use -mfentry when supported (this is for x86_64 right now)
Date: Fri, 18 Feb 2011 20:45:19 +0900 [thread overview]
Message-ID: <4D5E5BCF.1040509@hitachi.com> (raw)
In-Reply-To: <1297973501.23343.953.camel@gandalf.stny.rr.com>
(2011/02/18 5:11), Steven Rostedt wrote:
> On Fri, 2011-02-18 at 01:07 +0900, Masami Hiramatsu wrote:
>
>> I just thought that frequent stop-machine is not so good from the user's
>> POV. I agree that disabled probe ignoring the call is enough.
>> Maybe, it could be done with the similar mechanism of jump optimization.
>
> I thought jump optimization still calls stop_machine too?
Yes, but now it does batch optimization.
Even if hundreds kprobes are registered separately, jump optimization
has been done in background with a stop_machine per every 256 probes.
(Until optimizing, kprobes can use breakpoints instead)
Thank you,
--
Masami HIRAMATSU
2nd Dept. Linux Technology Center
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@hitachi.com
next prev parent reply other threads:[~2011-02-18 11:45 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-09 20:02 [RFC][PATCH 0/4] ftrace: Use -mfentry when supported (this is for x86_64 right now) Steven Rostedt
2011-02-09 20:02 ` [RFC][PATCH 1/4] ftrace: Make recordmcount.c handle __fentry__ Steven Rostedt
2011-02-09 20:02 ` [RFC][PATCH 2/4] ftrace: Add -mfentry to Makefile on function tracer Steven Rostedt
2011-02-09 20:28 ` Steven Rostedt
2011-02-09 21:22 ` H. Peter Anvin
2011-02-09 20:02 ` [RFC][PATCH 3/4] ftrace: Do not test frame pointers if -mfentry is used Steven Rostedt
2011-02-09 20:02 ` [RFC][PATCH 4/4] ftrace/x86: Add support for -mfentry to x86_64 Steven Rostedt
2011-02-10 2:38 ` [RFC][PATCH 0/4] ftrace: Use -mfentry when supported (this is for x86_64 right now) Masami Hiramatsu
2011-02-17 12:37 ` Masami Hiramatsu
2011-02-17 13:18 ` Steven Rostedt
2011-02-17 15:34 ` Masami Hiramatsu
2011-02-17 15:46 ` Steven Rostedt
2011-02-17 16:07 ` Masami Hiramatsu
2011-02-17 20:11 ` Steven Rostedt
2011-02-18 11:45 ` Masami Hiramatsu [this message]
2011-02-18 15:07 ` Steven Rostedt
2011-02-18 15:19 ` Mathieu Desnoyers
2011-02-18 20:10 ` Dominique Toupin
2011-02-18 20:36 ` Steven Rostedt
2011-02-18 21:45 ` Dominique Toupin
2011-02-18 22:39 ` Andi Kleen
2011-02-18 22:45 ` H. Peter Anvin
2011-02-18 23:02 ` Steven Rostedt
2011-02-19 5:07 ` Masami Hiramatsu
2011-02-19 5:10 ` hpas
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4D5E5BCF.1040509@hitachi.com \
--to=masami.hiramatsu.pt@hitachi.com \
--cc=2nddept-manager@sdl.hitachi.co.jp \
--cc=akpm@linux-foundation.org \
--cc=andi@firstfloor.org \
--cc=fweisbec@gmail.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mathieu.desnoyers@efficios.com \
--cc=mingo@elte.hu \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).