From: "Chris Friesen" <cfriesen@nortel.com>
To: Will Newton <will.newton@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>,
eranian@gmail.com, linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
linux-arch@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Eric Dumazet <dada1@cosmosbay.com>,
Robert Richter <robert.richter@amd.com>,
Arjan van de Veen <arjan@infradead.org>,
Peter Anvin <hpa@zytor.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Steven Rostedt <rostedt@goodmis.org>,
David Miller <davem@davemloft.net>,
Paul Mackerras <paulus@samba.org>,
Paolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Subject: Re: [patch] Performance Counters for Linux, v2
Date: Tue, 09 Dec 2008 11:35:01 -0600 [thread overview]
Message-ID: <493EAC45.4050704@nortel.com> (raw)
In-Reply-To: <87a5b0800812090846h396523a0kdb2d1ca4b4781851@mail.gmail.com>
Will Newton wrote:
> On Tue, Dec 9, 2008 at 1:46 PM, Ingo Molnar <mingo@elte.hu> wrote:
>
>> Firstly, sampling "at 1msec intervals" or any fixed period is a _very_
>> wrong mindset - and cross-sampling counters is a similarly wrong mindset.
>
> If your hardware does not interrupt on overflow I don't think you have
> any choice in the matter. I know such hardware is less than ideal but
> it exists so it should be supported.
I think you could still set up the counters as Ingo describes and then
sample the counters (as opposed to the program) at a suitable interval
(chosen such that the counters won't overflow more than once between
samples).
Chris
next prev parent reply other threads:[~2008-12-09 17:35 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
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 [this message]
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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