linux-kernel - Re: [PATCH] perf report: Display per-thread event counters

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Date:	Sat, 08 Aug 2009 18:10:34 +0200
From:	Brice Goglin <Brice.Goglin@...ia.fr>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, paulus@...ba.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf report: Display per-thread event counters

Ingo Molnar wrote:
>> [...] But I don't see yet where I am suppose to get something like 
>> PERF_READ_EVENT in builtin-stat.c so I haven't touched it yet.
>>     
>
> Yeah. 'perf stat' is not really getting events but is doing a 
> read-out of the counter value(s) and constructs its 'read event' 
> that way. So you wont find PERF_READ_EVENT in builtin-stat.c, you'll 
> find:
>
>                 res = read(fd[cpu][counter], single_count, nv * sizeof(u64));
>
> in read_counter(). The printout is then done in print_counter().
>   

Is there a way to get per-thread counters there? I wrote the code to
gather per-cpu counters there, but I don't see any way to get the
corresponding thread-id.

I looked at perf record to get some help. But I don't see where the
PERF_EVENT_READ are generated. I guess they are directly generated by
the kernel, read by perf record, and written as is to the output file?

thanks,
Brice

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