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From: fche@redhat.com (Frank Ch. Eigler)
To: Ingo Molnar <mingo@elte.hu>
Cc: "Pekka Enberg" <penberg@kernel.org>,
	"Paul Mackerras" <paulus@samba.org>,
	"Avi Kivity" <avi@redhat.com>,
	"Pekka Enberg" <penberg@cs.helsinki.fi>,
	"Tom Zanussi" <tzanussi@gmail.com>,
	=?iso-8859-1?Q?Fr=E9d=E9ric?= Weisbecker <fweisbec@gmail.com>,
	"Steven Rostedt" <rostedt@goodmis.org>,
	"Arnaldo Carvalho de Melo" <acme@redhat.com>,
	"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: Wed, 08 Sep 2010 15:30:59 -0400	[thread overview]
Message-ID: <y0m39tkdocs.fsf@fche.csb> (raw)
In-Reply-To: <20100908064427.GD3439@elte.hu> (Ingo Molnar's message of "Wed, 8 Sep 2010 08:44:27 +0200")


mingo wrote:

> [...] Do you know some interesting usecase that would be excluded
> via such address restrictions?

You could study tracing-oriented runtime systems such as those of
dtrace, dprobes, or even systemtap, to help answer such questions.


> Things like flexible arrays or more complex data structures such as
> trees couldnt be used initially. More complex data structures would
> need locking in any case. [...]  I.e. it would initially be
> restricted roughly to code where halting can be proven. Still looks
> interesting to me [...]

There are years of experience out there to learn from.  Note the sorts
of filtering expressions (never mind control logic) used in the prior
art, so that you can know what you're about to sacrifice by a
simple-sounding implementation.


- FChE

  parent reply	other threads:[~2010-09-08 19:31 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-06  9:12 disabling group leader perf_event 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
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 [this message]
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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