linux-kernel - Re: perf_counters: page fault trace record

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Message-ID: <18995.8319.322002.917595@cargo.ozlabs.ibm.com>
Date:	Sat, 13 Jun 2009 13:43:59 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: perf_counters: page fault trace record

Corey Ashford writes:

> One of the tools we are working on needs to be able to look not only at counts 
> of page faults, but where they are occurring (ip and faulting page address).
> 
> What would you think about adding a new bit to the config record, something like:

Can't you do what you need just using a page fault software counter
with sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_ADDR and
sample_period = 1?

Paul.
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