linux-kernel - Re: [RFC][PATCH 3/9] perf: export registerred pmus via sysfs

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Message-ID: <1273567815.5605.3491.camel@twins>
Date:	Tue, 11 May 2010 10:50:15 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"eranian@...il.com" <eranian@...il.com>,
	"Gary.Mohr@...l.com" <Gary.Mohr@...l.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Paul Mundt <lethal@...ux-sh.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Maynard Johnson <mpjohn@...ibm.com>,
	Carl Love <carll@...ibm.com>
Subject: Re: [RFC][PATCH 3/9] perf: export registerred pmus via sysfs

On Tue, 2010-05-11 at 16:20 +0800, Lin Ming wrote:

> How will this sysfs interface be used for userspace tool?
> 
>  /sys/devices/system/node/nodeN/node_events
>                                node_events/event_source_id
> 
>                                node_events/local_misses/event_id
>                                           /local_hits/event_id
>                                           /remote_misses/event_id
>                                           /remote_hits/event_id
> 
> For example, to monitor node event local_misses on node 0, does it work
> as below?
> 
> 1. perf top -e local_misses -n 0 (-n 0 means node 0)
> 
> 2. read /sys/devices/system/node/node0/node_events/event_source_id to
> get the pmu_id
> 
> 3. read /sys/devices/system/node/node0/node_events/local_misses/event_id
> to get the event_id
> 
> 4. event_attr::pmu_id=pmu_id, event::config=event_id
> 
> 5. other setting...
> 
> 6. call syscall perf_event_open(....)

No, you'll use event_source_id as perf_event_attr::type, use event_id as
perf_event_attr::config and then use a cpu-wide counter on a cpu
contained in node0.


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