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

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Message-ID: <d8cfb036-90a7-576e-86a1-c0144339418d@gmail.com>
Date:   Tue, 29 Nov 2016 11:58:03 -0700
From:   David Ahern <dsahern@...il.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        David Ahern <dsa@...ulusnetworks.com>
Cc:     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

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.

> 
> 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 ~]#