linux-kernel - Re: [PATCH v2] tracing/uprobes: Support ftrace_event

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Date:	Mon, 24 Jun 2013 20:53:01 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] tracing/uprobes: Support ftrace_event_file base
	multibuffer

forgot to mention,

On 06/24, Oleg Nesterov wrote:
>
> > +	/*
> > +	 * Currently TP_FLAG_TRACE/TP_FLAG_PROFILE are mutually exclusive
> > +	 * for uprobe(filter argument issue), this need to fix in future.
                      ^^^^^^^^^^^^^^^^^^^^^

Just in case, this is not that simple.

For example, suppose that TRACE_REG_REGISTER comes after
TRACE_REG_PERF_REGISTER. In this case we need uprobe_perf_open-like
code to establish nr_systemwide != 0 and do uprobe_apply() if
necessary.

Oleg.

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