linux-kernel - Re: [PATCH v2 4/6] perf sched timehist: Add option to specify time window of interest

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Message-ID: <20161129192126.GE23423@kernel.org>
Date:   Tue, 29 Nov 2016 16:21:26 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     David Ahern <dsahern@...il.com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        David Ahern <dsa@...ulusnetworks.com>, mingo@...nel.org,
        peterz@...radead.org, namhyung@...nel.org, jolsa@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/6] perf sched timehist: Add option to specify time
 window of interest

Em Tue, Nov 29, 2016 at 11:58:03AM -0700, David Ahern escreveu:
> On 11/29/16 11:56 AM, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Nov 29, 2016 at 10:15:44AM -0700, David Ahern escreveu:
> >> Add option to allow user to control analysis window. e.g., collect data
> >> for time window and analyze a segment of interest within that window.
> > Trying to test this I got:
> > 
> > [root@...et ~]# perf sched timehist
> > No trace sample to read. Did you call 'perf record -R'?
> > [root@...et ~]#
> > 
> > Could you please provide a better error message?
> 
> sure, but that error is unrelated to this patch set.

I haven't said it was... 8-) This patchset is processed and pushed out,
just doing a 'make -C tools/perf build-test' + perf test + build on lots
of containers pass before sending a pull req to Ingo,

- Arnaldo
 
> > 
> > The perf.data file had this:
> > 
> > [root@...et ~]# perf evlist -v
> > cycles:ppp: size: 112, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|CALLCHAIN|CPU|PERIOD, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, task: 1, precise_ip: 3, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1
> > [root@...et ~]#