From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>,
Andi Kleen <andi@firstfloor.org>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
Stephane Eranian <eranian@googlemail.com>,
Eric Dumazet <dada1@cosmosbay.com>,
Robert Richter <robert.richter@amd.com>,
Arjan van de Veen <arjan@infradead.org>,
Peter Anvin <hpa@zytor.com>,
"David S. Miller" <davem@davemloft.net>,
Maynard Johnson <mpjohn@us.ibm.com>,
carll@us.ibm.com
Subject: Re: Performance counter API review was [patch] Performance Counters for Linux, v3
Date: Wed, 04 Feb 2009 11:51:44 +0100 [thread overview]
Message-ID: <1233744704.5076.4.camel@laptop> (raw)
In-Reply-To: <18825.29238.559809.341658@cargo.ozlabs.ibm.com>
On Wed, 2009-02-04 at 21:47 +1100, Paul Mackerras wrote:
> Peter Zijlstra writes:
>
> > How is smp_call_function() going to help here? You still need to pull
> > all that data through that one FD. That's a cacheline bounce fest.
>
> Well, let's put this into perspective. We would be collecting 8 bytes
> of data from each CPU. Hardly a "cacheline bounce fest". :)
Ah, I was thinking more of the event triggered profiling, like NMI time,
cachemiss or pagefault profiling.
In those cases you'd get a continuous stream of data for each cpu, at
possibly quite high speeds.
prev parent reply other threads:[~2009-02-04 10:52 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-11 15:52 [patch] Performance Counters for Linux, v3 Ingo Molnar
2008-12-11 18:02 ` Vince Weaver
2008-12-12 8:25 ` Peter Zijlstra
2008-12-12 8:35 ` stephane eranian
2008-12-12 8:51 ` Peter Zijlstra
2008-12-12 9:00 ` Peter Zijlstra
2008-12-12 9:07 ` Ingo Molnar
2008-12-12 8:59 ` stephane eranian
2008-12-12 9:23 ` Peter Zijlstra
2008-12-12 10:21 ` Robert Richter
2008-12-12 10:59 ` Christoph Hellwig
2008-12-12 11:35 ` Robert Richter
2008-12-12 16:45 ` Chris Friesen
2008-12-12 17:42 ` stephane eranian
2008-12-12 18:01 ` stephane eranian
2008-12-12 19:45 ` Chris Friesen
2008-12-15 14:50 ` stephane eranian
2008-12-15 22:32 ` Chris Friesen
2008-12-17 7:45 ` stephane eranian
2008-12-14 23:13 ` Ingo Molnar
2008-12-15 0:37 ` Paul Mackerras
2008-12-15 12:58 ` stephane eranian
2008-12-15 14:42 ` stephane eranian
2008-12-15 20:58 ` stephane eranian
2008-12-15 22:53 ` Paul Mackerras
2008-12-13 11:17 ` Peter Zijlstra
2008-12-13 13:48 ` Henrique de Moraes Holschuh
2008-12-13 17:44 ` stephane eranian
2008-12-14 1:02 ` Paul Mackerras
2008-12-14 22:37 ` Ingo Molnar
2008-12-15 0:50 ` Paul Mackerras
2008-12-15 13:02 ` stephane eranian
2008-12-12 17:03 ` Samuel Thibault
2008-12-12 17:11 ` Peter Zijlstra
2008-12-12 18:18 ` Vince Weaver
2008-12-11 18:35 ` Andrew Morton
2008-12-12 6:22 ` Ingo Molnar
2008-12-11 19:11 ` Tony Luck
2008-12-11 19:34 ` Ingo Molnar
2008-12-12 8:29 ` Peter Zijlstra
2008-12-12 8:54 ` Ingo Molnar
2008-12-12 13:42 ` Andi Kleen
2008-12-14 14:51 ` Performance counter API review was " Andi Kleen
2009-02-02 20:03 ` Corey Ashford
2009-02-02 20:33 ` Peter Zijlstra
2009-02-03 16:53 ` Maynard Johnson
2009-02-04 2:18 ` Paul Mackerras
2009-02-04 2:32 ` Nathan Lynch
2009-02-04 8:45 ` Peter Zijlstra
2009-02-04 10:47 ` Paul Mackerras
2009-02-04 10:51 ` Peter Zijlstra [this message]
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