From: David Miller <davem@davemloft.net>
To: mingo@elte.hu
Cc: paulus@samba.org, linux-kernel@vger.kernel.org,
tglx@linutronix.de, linux-arch@vger.kernel.org,
akpm@linux-foundation.org, eranian@googlemail.com,
dada1@cosmosbay.com, robert.richter@amd.com, arjan@infradead.org,
hpa@zytor.com, a.p.zijlstra@chello.nl, rostedt@goodmis.org
Subject: Re: [patch] Performance Counters for Linux, v2
Date: Mon, 08 Dec 2008 04:02:04 -0800 (PST) [thread overview]
Message-ID: <20081208.040204.139217002.davem@davemloft.net> (raw)
In-Reply-To: <20081208113318.GA14723@elte.hu>
From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 8 Dec 2008 12:33:18 +0100
> Your whole statistical argument that group readout is a must-have for
> precision is fundamentally flawed as well: counters _themselves_, as used
> by most applications, by their nature, are a statistical sample to begin
> with. There's way too many hardware events to track each of them
> unintrusively - so this type of instrumentation is _all_ sampling based,
> and fundamentally so. (with a few narrow exceptions such as single-event
> interrupts for certain rare event types)
There are a lot of people who are going to fundamentally
disagree with this, myself included.
A lot of things are being stated about what people do with this stuff,
but I think there are people working longer in this area who quite
possibly know a lot better. But they were blindsided by this new work
instead of being consulted, which was pretty unnice.
next prev parent reply other threads:[~2008-12-08 12:02 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-08 1:22 [patch] Performance Counters for Linux, v2 Ingo Molnar
2008-12-08 1:49 ` Arjan van de Ven
2008-12-08 11:49 ` Ingo Molnar
2009-01-07 7:43 ` Zhang, Yanmin
2009-01-09 1:07 ` Zhang, Yanmin
2008-12-08 3:24 ` Paul Mackerras
2008-12-08 11:33 ` Ingo Molnar
2008-12-08 12:02 ` David Miller [this message]
2008-12-08 14:41 ` Andi Kleen
2008-12-08 22:03 ` Paul Mackerras
2008-12-09 13:00 ` Ingo Molnar
2008-12-09 23:00 ` Paul Mackerras
2008-12-08 8:32 ` Corey J Ashford
2008-12-09 6:37 ` stephane eranian
2008-12-09 11:02 ` Ingo Molnar
2008-12-09 11:11 ` David Miller
2008-12-09 11:22 ` Ingo Molnar
2008-12-09 11:29 ` David Miller
2008-12-09 12:14 ` Paolo Ciarrocchi
2008-12-09 13:46 ` Ingo Molnar
2008-12-09 16:39 ` Chris Friesen
2008-12-09 19:02 ` Ingo Molnar
2008-12-09 19:51 ` Chris Friesen
2008-12-09 16:46 ` Will Newton
2008-12-09 17:35 ` Chris Friesen
2008-12-09 21:16 ` stephane eranian
2008-12-09 21:16 ` stephane eranian
2008-12-09 22:19 ` Paul Mackerras
2008-12-09 22:40 ` Andi Kleen
2008-12-10 4:44 ` Paul Mackerras
2008-12-10 5:03 ` stephane eranian
2008-12-10 10:26 ` Andi Kleen
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