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From: Ingo Molnar <mingo@elte.hu>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Chris Mason <chris.mason@oracle.com>
Subject: Re: [PATCH 0/2] ftrace: updates to tip
Date: Sun, 18 Jan 2009 08:27:53 +0100	[thread overview]
Message-ID: <20090118072753.GA3398@elte.hu> (raw)
In-Reply-To: <20090117223451.GA27065@elte.hu>


* Ingo Molnar <mingo@elte.hu> wrote:

> 
> * Steven Rostedt <rostedt@goodmis.org> wrote:
> 
> > > This would allow the creation of "surgical" one-time traces - of 
> > > events and functions one is specifically interested in.
> > 
> > This all sounds great, but it would add a lot of conditionals into a 
> > extremely hot function tracer path. [...]
> 
> Why would we need more than exactly one unlikely() condition to handle 
> all of this?

We could even do it with zero branches, burdening none of the hotpaths of 
existing functionality. Hm?

	Ingo

  reply	other threads:[~2009-01-18  7:28 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-01-16  0:40 [PATCH 0/2] ftrace: updates to tip Steven Rostedt
2009-01-16  0:40 ` [PATCH 1/2] ftrace: fix trace_output Steven Rostedt
2009-01-16  1:40   ` Andrew Morton
2009-01-16  1:46     ` Steven Rostedt
2009-01-16  0:40 ` [PATCH 2/2] ftrace: add stack trace to function tracer Steven Rostedt
2009-01-16  0:48   ` Steven Rostedt
2009-01-16 10:08   ` Frédéric Weisbecker
2009-01-16 14:28     ` Steven Rostedt
2009-01-16 11:19   ` Ingo Molnar
2009-01-16 11:23 ` [PATCH 0/2] ftrace: updates to tip Ingo Molnar
2009-01-16 13:08   ` Frédéric Weisbecker
2009-01-16 13:10     ` Ingo Molnar
2009-01-16 14:32   ` Steven Rostedt
2009-01-16 15:21     ` Ingo Molnar
2009-01-16 15:53       ` Steven Rostedt
2009-01-16 16:02         ` Ingo Molnar
2009-01-16 16:03           ` Ingo Molnar
2009-01-16 16:22           ` Steven Rostedt
2009-01-16 16:30             ` Ingo Molnar
2009-01-16 22:59               ` Ingo Molnar
2009-01-17  1:14                 ` Steven Rostedt
2009-01-17 13:48                   ` Frederic Weisbecker
2009-01-17 22:34                   ` Ingo Molnar
2009-01-18  7:27                     ` Ingo Molnar [this message]
2009-01-16 21:47 ` Chris Mason
2009-01-16 22:26   ` Ingo Molnar
2009-01-17  1:30     ` Chris Mason
2009-01-17  2:38     ` Arnaldo Carvalho de Melo
2009-01-19 13:31       ` Ingo Molnar

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