From: Namhyung Kim <namhyung@kernel.org>
Subject: Re: Intel PEBS Load Latency Measurement
Date: Fri, 01 Nov 2013 17:41:18 +0900
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In-Reply-To: <CALbiyZyimUGh5MfjyBcH4UdvwX=S0V2uKJz3px1CaKg_HrMzeA@mail.gmail.com>
	(Manuel Selva's message of "Tue, 29 Oct 2013 14:20:09 +0100")
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To: Manuel Selva <selva.manuel@gmail.com>
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On Tue, 29 Oct 2013 14:20:09 +0100, Manuel Selva wrote:
> One more thing I forgot to ask is clarification about the pid
> parameter. According to Vince Weaver page: "If pid is 0, measurements
> happen on the current thread, if pid is greater than 0, the process
> indicated by pid is measured, and if pid is -1, all processes are
> counted." and according to perf userland tool wiki page, it's possible
> to attache to a specific thread with a -i option. As a consequence I
> wonder how I can use the perf perf_event_sys_call to only count events
> for a specific thread ?

In the syscall's point of view, pid is actually tid AFAIK - so I works
on the thread-basis not the process.

Thanks,
Namhyung