linux-kernel - Re: ftrace multibuffer && rcu (Was: tracing/uprobes: Support ftrace_event

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Message-ID: <20130614170224.GA23890@redhat.com>
Date:	Fri, 14 Jun 2013 19:02:24 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	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: ftrace multibuffer && rcu (Was: tracing/uprobes: Support
	ftrace_event_file base multibuffer)

On 06/14, Steven Rostedt wrote:
>
> On Fri, 2013-06-14 at 18:04 +0200, Oleg Nesterov wrote:
> >
> > But the main problem is, synchronize_sched() is slow and it is called
> > under the global event_mutex.
>
> But is that really an issue? event_mutex is used to add or remove
> events, and this happens only when we load or unload a module, or add or
> remove a probe. These are mostly user operations that take a relatively
> long time to complete (but not relative to humans).

OK, please ignore then.

Oleg.

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