linux-kernel - Re: perf script: Question: Python trace processing script contains the tid of the process in the common

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Date:   Sat, 1 Jul 2017 11:47:03 -0300
From:   Arnaldo Carvalho de Melo <acme@...hat.com>
To:     Arun Kalyanasundaram <arunkaly@...gle.com>
Cc:     tzanussi@...il.com, linux-kernel@...r.kernel.org,
        David Carrillo-Cisneros <davidcc@...gle.com>, acme@...nel.org
Subject: Re: perf script: Question: Python trace processing script contains
 the tid of the process in the common_pid attribute

Em Fri, Jun 30, 2017 at 03:40:57PM -0700, Arun Kalyanasundaram escreveu:
> The handlers in the python script generated from "perf script" have an
> attribute: common_pid. This attribute contains the tid of the process
> instead of its pid. I would like to know if this is the expected behavior.
> There are no other attributes in the Python handler that provide the pid
> and knowing the process id is useful to be able to group all samples that
> belong to the same process that generated different threads.

Humm, you have:

def process_event(param_dict):
        event_attr = param_dict["attr"]
        sample     = param_dict["sample"]
        raw_buf    = param_dict["raw_buf"]
        comm       = param_dict["comm"]
        name       = param_dict["ev_name"]

And then, on sample you have (from a recent python script for processing
Intel PT samples):

def print_common_start(comm, sample, name):
       ts = sample["time"]
       cpu = sample["cpu"]
       pid = sample["pid"]
       tid = sample["tid"]
       print "%16s %5u/%-5u [%03u] %9u.%09u %7s:" % (comm, pid, tid, cpu, ts / 1000000000, ts %1000000000, name),

- Arnaldo