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From: Ingo Molnar <mingo@elte.hu>
To: "Avi Kivity" <avi@redhat.com>, "Tom Zanussi" <tzanussi@gmail.com>,
	"Frédéric Weisbecker" <fweisbec@gmail.com>,
	"Steven Rostedt" <rostedt@goodmis.org>,
	"Arnaldo Carvalho de Melo" <acme@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	linux-perf-users@vger.kernel.org,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: disabling group leader perf_event
Date: Mon, 6 Sep 2010 14:43:30 +0200	[thread overview]
Message-ID: <20100906124330.GA22314@elte.hu> (raw)
In-Reply-To: <4C84D77B.6040600@redhat.com>


* Avi Kivity <avi@redhat.com> wrote:

> > Being able to make histograms in-kernel has been on the todo list 
> > for a long while, its just that I never could come up with a sane 
> > interface.. :/
> 
> Interesting, I thought it was just me.
> 
> One option is to keep the existing filter interface, but recognize 
> those cases and optimize the implementation.  Sort of like a compiler 
> can optimize a large dense switch statement to a jump table.

Yes. The filter engine is a safe, in-kernel interpreted language in the 
making. The C syntax was chosen because it's close to the heart of every 
kernel developer.

It might make sense to bring this concept a few steps further. Looks 
rather complex but also rather cool ...

Thanks,

	Ingo

  parent reply	other threads:[~2010-09-06 12:43 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-06  9:12 Avi Kivity
2010-09-06 11:24 ` Peter Zijlstra
2010-09-06 11:34   ` Avi Kivity
2010-09-06 11:54     ` Peter Zijlstra
2010-09-06 11:58       ` Avi Kivity
2010-09-06 12:29         ` Peter Zijlstra
2010-09-06 12:40           ` Ingo Molnar
2010-09-06 13:16             ` Steven Rostedt
2010-09-06 16:42               ` Tom Zanussi
2010-09-07 12:53                 ` Steven Rostedt
2010-09-07 14:16                   ` Tom Zanussi
2010-09-06 12:49           ` Avi Kivity
2010-09-06 12:43         ` Ingo Molnar [this message]
2010-09-06 12:45           ` Avi Kivity
2010-09-06 12:59             ` Ingo Molnar
2010-09-06 13:41               ` Pekka Enberg
2010-09-06 13:54                 ` Ingo Molnar
2010-09-06 14:57               ` Avi Kivity
2010-09-06 15:30                 ` Alan Cox
2010-09-06 15:20                   ` Avi Kivity
2010-09-06 15:48                     ` Alan Cox
2010-09-06 17:50                       ` Avi Kivity
2010-09-06 15:47                 ` Ingo Molnar
2010-09-06 17:55                   ` Avi Kivity
2010-09-07  3:44                     ` Ingo Molnar
2010-09-07  8:33                       ` Stefan Hajnoczi
2010-09-07  9:13                         ` Avi Kivity
2010-09-07 22:43                         ` Ingo Molnar
2010-09-07 15:55                       ` Alan Cox
2010-09-08  1:44                       ` Paul Mackerras
2010-09-08  6:16                         ` Pekka Enberg
2010-09-08  6:44                           ` Ingo Molnar
2010-09-08  7:30                             ` Peter Zijlstra
2010-09-08 19:30                             ` Frank Ch. Eigler
2010-09-09  7:38                               ` Ingo Molnar
2010-09-08  6:19                         ` Avi Kivity
2010-09-06 20:31                   ` Pekka Enberg
2010-09-06 20:37                     ` Pekka Enberg
2010-09-07  4:03                     ` Ingo Molnar
2010-09-07  9:30                       ` Pekka Enberg
2010-09-07 22:27                         ` Ingo Molnar
2010-09-07 10:57                     ` KOSAKI Motohiro
2010-09-07 12:14                       ` Pekka Enberg
2010-09-07 13:35                   ` Steven Rostedt
2010-09-07 13:47                     ` Avi Kivity
2010-09-07 16:02                       ` Steven Rostedt
2010-09-12  6:46                   ` Pavel Machek
2010-09-12 17:54                     ` Avi Kivity
2010-09-12 18:48                       ` Ingo Molnar
2010-09-12 19:14                         ` Pavel Machek
2010-09-12 20:32                           ` Ingo Molnar
2010-09-12 21:06                             ` Pavel Machek
2010-09-12 22:19                               ` Ingo Molnar

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