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From: Arjan van de Ven <arjan@linux.intel.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@elte.hu>, David Sharp <dhsharp@google.com>,
	Vaibhav Nagarnaik <vnagarnaik@google.com>,
	Michael Rubin <mrubin@google.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: Fix powerTOP regression with 2.6.39-rc5
Date: Sat, 07 May 2011 10:59:36 -0700	[thread overview]
Message-ID: <4DC58888.9030402@linux.intel.com> (raw)
In-Reply-To: <1304788829.11129.57.camel@frodo>

On 5/7/2011 10:20 AM, Steven Rostedt wrote:
> On Sat, 2011-05-07 at 16:44 +0200, Ingo Molnar wrote:
>> * Steven Rostedt<rostedt@goodmis.org>  wrote:
>>
>>> 2) we separate perf from ftrace and keep the "stable" ABI for perf, and let
>>> ftrace advance into a more efficient tracer.
>> The thing is, ftrace is still largely separated from perf, and this is why this
>> regression came in: a random tracing 'cleanup' churn was done to 'tracing'
>> which broke PowerTop.
>>
>> Look at the commit itself:
>>
>>    e6e1e2593592: tracing: Remove lock_depth from event entry
>>
>> Clearly you didnt even *realize* that there's a whole tooling world behind this
>> mechanism ...
> Note, I discussed this change with Frederic and he totally agreed with
> me on removing it. In fact, we are in discussions about getting rid of
> pid, preempt-count, and irq flags as well. But according to your logic,
> that is a no go. I guess Frederic also does not *realize* there's a
> whole tooling world behind this mechanism too.

btw if you remove some of these, how is userland supposed to find out if 
an event happened in irq context?



  reply	other threads:[~2011-05-07 17:59 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-06 20:08 Fix powerTOP regression with 2.6.39-rc5 Arjan van de Ven
2011-05-06 20:20 ` Steven Rostedt
2011-05-06 20:51   ` Linus Torvalds
2011-05-06 21:10     ` Steven Rostedt
2011-05-06 21:24       ` Linus Torvalds
2011-05-06 21:14     ` Steven Rostedt
2011-05-06 21:28       ` Linus Torvalds
2011-05-06 21:29     ` Arjan van de Ven
2011-05-06 21:57       ` Steven Rostedt
2011-05-07  6:58     ` Ingo Molnar
2011-05-07 10:45       ` Steven Rostedt
2011-05-07 14:44         ` Ingo Molnar
2011-05-07 17:20           ` Steven Rostedt
2011-05-07 17:59             ` Arjan van de Ven [this message]
2011-05-08 21:08               ` Frederic Weisbecker
2011-05-08 21:56                 ` Arjan van de Ven
2011-05-07 19:00             ` Ingo Molnar
2011-05-10  3:07               ` Steven Rostedt
2011-05-10  4:44                 ` Dave Chinner
2011-05-10  5:39                   ` Steven Rostedt
2011-05-10  7:36                     ` Dave Chinner
2011-05-10  7:54                 ` Ingo Molnar
2011-05-10  8:09                 ` Ingo Molnar
2011-05-10  8:32                   ` Arjan van de Ven
2011-05-10  8:44                     ` Ingo Molnar
2011-05-10  9:14                       ` Pekka Enberg
2011-05-10  8:41                 ` Ingo Molnar
2011-05-10 13:06                   ` Steven Rostedt
2011-05-11 21:51                     ` Ingo Molnar
2011-05-11 22:36                       ` Steven Rostedt
2011-05-17  7:15                       ` Michael Rubin
2011-05-17 11:19                         ` Steven Rostedt
2011-05-17 13:24                           ` David Ahern
2011-05-17 13:27                             ` Steven Rostedt
2011-05-17 13:30                               ` Ingo Molnar
2011-05-10  8:47                 ` Ingo Molnar
2011-05-10 10:33                   ` Steven Rostedt
2011-05-10 19:13                     ` David Sharp
2011-05-09 23:37             ` David Sharp
2011-05-10  7:39               ` Ingo Molnar

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