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From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	Paul Mackerras <paulus@samba.org>,
	Stephane Eranian <eranian@google.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Subject: Re: [RFC PATCH 0/4] perf: Custom contexts
Date: Wed, 16 Mar 2011 14:56:15 +0100	[thread overview]
Message-ID: <1300283775.2203.1516.camel@twins> (raw)
In-Reply-To: <20110316135308.GA1774@nowhere>

On Wed, 2011-03-16 at 14:53 +0100, Frederic Weisbecker wrote:
> On Tue, Mar 15, 2011 at 11:32:54PM +0100, Peter Zijlstra wrote:
> > Right, so I don't much like the interface, two new ioctl()s and a flag
> > of dubious use.
> 
> Do you think we need a new syscall for this new feature.

No.

> > How important is this recursive nature of the thing to you:
> > 
> > > It's supposed to support infinite combinations with starter having starters
> > > themselves, plus filters, etc...
> > 
> > We've so far avoided recursion like that, we only have single level
> > groups etc.
> 
> There is actually no recursivity of any sort that the kernel has to handle.
> The starter/stopper links are never handled recursively. ie: there is no
> loop walking through the entire chain of starter to starter to starter, etc...
> 
> It's always only handled between direct related event: starter and target, but
> never further.
> 
> Only the final effect has recursion properties in the resulting count
> or trace.

That's not an answer to my question.

  reply	other threads:[~2011-03-16 13:56 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-14 19:17 [RFC PATCH 0/4] perf: Custom contexts Frederic Weisbecker
2011-03-14 19:18 ` [RFC PATCH 1/4] perf: Starter and stopper events Frederic Weisbecker
2011-03-15 14:36   ` Lin Ming
2011-03-15 17:54     ` Frederic Weisbecker
2011-03-16 14:21       ` Frederic Weisbecker
2011-03-14 19:18 ` [RFC PATCH 3/4] perf: Support for starter and stopper in tools Frederic Weisbecker
2011-03-14 19:18 ` [RFC PATCH 4/4] perf: New --enable-on-starter option Frederic Weisbecker
2011-03-14 20:43 ` [RFC PATCH 0/4] perf: Custom contexts Arnaldo Carvalho de Melo
2011-03-14 20:51   ` Frederic Weisbecker
2011-03-14 21:03     ` Arnaldo Carvalho de Melo
2011-03-14 21:20       ` Frederic Weisbecker
2011-03-14 21:56         ` Arnaldo Carvalho de Melo
2011-03-14 22:19           ` Arnaldo Carvalho de Melo
2011-03-14 22:43           ` Frederic Weisbecker
2011-03-14 23:02             ` Arnaldo Carvalho de Melo
2011-03-15 18:58               ` Frederic Weisbecker
2011-03-15 19:24                 ` Arnaldo Carvalho de Melo
2011-03-16  1:03                   ` Frederic Weisbecker
2011-03-16 15:47                     ` Masami Hiramatsu
2011-03-16 17:53                       ` Arnaldo Carvalho de Melo
2011-03-16 18:02                         ` Peter Zijlstra
2011-03-15 22:32 ` Peter Zijlstra
2011-03-16 13:53   ` Frederic Weisbecker
2011-03-16 13:56     ` Peter Zijlstra [this message]
2011-03-16 14:02       ` Frederic Weisbecker
2011-03-16 14:31         ` Peter Zijlstra
2011-03-25 14:47           ` Frederic Weisbecker
2011-03-25 15:03             ` Peter Zijlstra
2011-04-13 14:27               ` Frederic Weisbecker

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