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From: Ingo Molnar <mingo@elte.hu>
To: "Peter Zijlstra" <peterz@infradead.org>,
	"Tom Zanussi" <tzanussi@gmail.com>,
	"Frédéric Weisbecker" <fweisbec@gmail.com>,
	"Steven Rostedt" <rostedt@goodmis.org>,
	"Arnaldo Carvalho de Melo" <acme@redhat.com>
Cc: Avi Kivity <avi@redhat.com>,
	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 14:40:46 +0200	[thread overview]
Message-ID: <20100906124046.GA20777@elte.hu> (raw)
In-Reply-To: <1283776189.1930.380.camel@laptop>


* Peter Zijlstra <peterz@infradead.org> wrote:

> On Mon, 2010-09-06 at 14:58 +0300, Avi Kivity wrote:
> > On 09/06/2010 02:54 PM, Peter Zijlstra wrote:
> > >
> > >> Basically, to read() all events in one go.  I have many of them.
> > >>
> > >> My current problem is that I have an event (kvm_exit) which I want to
> > >> drill down by looking at a field (exit_reason).  So I create lots of
> > >> separate perf_events with a filter for each reason:
> > >> kvm_exit(exit_reason==0), kvm_exit(exit_reason==1), etc.  But filters
> > >> are fairly slow (can have ~60 such events on AMD), so I want to make
> > >> this drill-down optional.
> > > Yeah, filters suck.
> > 
> > Any idea why?  I saw nothing obvious in the code, except that there 
> > is lots of it.
> 
> It filters after it does all the hard work of creating the trace 
> event, instead of before.

Btw., that's an implementational property of filters that would be nice 
to fix.

If it's not doable within CPP then outside of it.

	Ingo

  reply	other threads:[~2010-09-06 12:41 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 [this message]
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
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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