From: Steven Rostedt <rostedt@goodmis.org>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
"Frank Ch. Eigler" <fche@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
yrl.pp-manager.tt@hitachi.com
Subject: Re: [RFC PATCH -tip 0/9]ftrace, kprobes: Ftrace-based kprobe optimization
Date: Wed, 30 May 2012 07:39:38 -0400 [thread overview]
Message-ID: <1338377978.13348.308.camel@gandalf.stny.rr.com> (raw)
In-Reply-To: <4FC5C55E.9000909@hitachi.com>
On Wed, 2012-05-30 at 15:59 +0900, Masami Hiramatsu wrote:
> Hmm, I'm not so sure how the notrace and filter works.
> What happens if I set a foo function-entry on filter
> and keep notrace empty?
> - only foo's nop is replaced with call?
> - or all functions including foo is traced?
>From Documentation/trace/ftrace.txt:
"If a function exists in both set_ftrace_filter
and set_ftrace_notrace, the function will _not_ be traced."
The filters work exactly the same. If notrace always take precedence
over filter. If you have foo and bar in filter, and put foo in notrace,
then only bar is traced.
"filter" means "limit tracing only to these functions"
"notrace" means "do not trace this function"
Think of 'filter' as a way of making the 'available_filter_functions'
smaller. It filters the list. But 'notrace' is just like adding a
'notrace' tag. It stops it from being traced regardless.
-- Steve
next prev parent reply other threads:[~2012-05-30 11:39 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-29 12:48 Masami Hiramatsu
2012-05-29 12:48 ` [RFC PATCH -tip 1/9] ftrace: Add pt_regs acceptable trace callback Masami Hiramatsu
2012-06-02 2:07 ` Steven Rostedt
2012-06-04 13:58 ` Masami Hiramatsu
2012-06-04 14:25 ` Steven Rostedt
2012-06-04 14:57 ` Masami Hiramatsu
2012-06-04 15:11 ` Steven Rostedt
2012-05-29 12:49 ` [RFC PATCH -tip 2/9] ftrace/x86-64: support SAVE_REGS feature on x86-64 Masami Hiramatsu
2012-05-29 23:05 ` Steven Rostedt
2012-05-30 6:39 ` Masami Hiramatsu
2012-05-30 11:34 ` Steven Rostedt
2012-05-29 12:49 ` [RFC PATCH -tip 3/9] ftrace/x86: Support SAVE_REGS feature on i386 Masami Hiramatsu
2012-05-29 12:49 ` [RFC PATCH -tip 4/9] ftrace: add ftrace_set_filter_ip() for address based filter Masami Hiramatsu
2012-05-29 12:49 ` [RFC PATCH -tip 5/9] kprobes: Inverse taking of module_mutex with kprobe_mutex Masami Hiramatsu
2012-05-29 12:49 ` [RFC PATCH -tip 6/9] kprobes: cleanup to separate probe-able check Masami Hiramatsu
2012-05-29 12:49 ` [RFC PATCH -tip 7/9] kprobes: Move locks into appropriate functions Masami Hiramatsu
2012-05-29 12:49 ` [RFC PATCH -tip 8/9] kprobes: introduce ftrace based optiomization Masami Hiramatsu
2012-05-30 7:22 ` Ananth N Mavinakayanahalli
2012-05-30 7:56 ` Masami Hiramatsu
2012-05-29 12:49 ` [RFC PATCH -tip 9/9] kprobes/x86: ftrace based optiomization for x86 Masami Hiramatsu
2012-05-29 22:45 ` [RFC PATCH -tip 0/9]ftrace, kprobes: Ftrace-based kprobe optimization Steven Rostedt
2012-05-30 6:59 ` Masami Hiramatsu
2012-05-30 11:39 ` Steven Rostedt [this message]
2012-05-31 15:01 ` Masami Hiramatsu
2012-05-31 15:15 ` Steven Rostedt
2012-05-31 15:28 ` Masami Hiramatsu
2012-06-01 13:36 ` Masami Hiramatsu
2012-06-01 14:20 ` Steven Rostedt
2012-06-04 11:45 ` Masami Hiramatsu
2012-06-04 12:07 ` Steven Rostedt
2012-06-04 12:24 ` Masami Hiramatsu
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