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From: Namhyung Kim <namhyung@kernel.org>
To: Manuel Selva <selva.manuel@gmail.com>
Cc: linux-perf-users@vger.kernel.org
Subject: Re: Intel PEBS Load Latency Measurement
Date: Fri, 01 Nov 2013 17:41:18 +0900	[thread overview]
Message-ID: <87eh704iq9.fsf@sejong.aot.lge.com> (raw)
In-Reply-To: <CALbiyZyimUGh5MfjyBcH4UdvwX=S0V2uKJz3px1CaKg_HrMzeA@mail.gmail.com> (Manuel Selva's message of "Tue, 29 Oct 2013 14:20:09 +0100")

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

  reply	other threads:[~2013-11-01  8:41 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-09-17  7:44 Intel PEBS Load Latency Measurement Manuel Selva
2013-09-19  8:22 ` Andi Kleen
2013-10-28 11:28 ` Manuel Selva
2013-10-29  2:36   ` Namhyung Kim
     [not found]     ` <CALbiyZy_JE+wai7d_=r-XzE+FdHRitTiAuPmANtRt7Qpet8fTg@mail.gmail.com>
2013-10-29  9:12       ` Fwd: " Manuel Selva
2013-10-29 13:20         ` Manuel Selva
2013-11-01  8:41           ` Namhyung Kim [this message]
2013-11-01  9:02             ` Manuel Selva
2013-11-01 17:02             ` Vince Weaver
2013-11-01 18:08               ` Manuel Selva
2013-11-01  8:38         ` Fwd: " Namhyung Kim
2013-11-06 13:06           ` Manuel Selva
2013-11-06 13:41           ` Stephane Eranian

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