linux-kernel - Re: [PATCH] perf record: Set timestamp boundary for AUX area events

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Message-ID: <20210503145637.GN4032392@tassilo.jf.intel.com>
Date:   Mon, 3 May 2021 07:56:37 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf record: Set timestamp boundary for AUX area events

On Mon, May 03, 2021 at 09:42:22AM +0300, Adrian Hunter wrote:
> AUX area data is not processed by 'perf record' and consequently the
>  --timestamp-boundary option may result in no values for "time of first
> sample" and "time of last sample". However there are non-sample events
> that can be used instead, namely 'itrace_start' and 'aux'.
> 'itrace_start' is issued before tracing starts, and 'aux' is issued
> every time data is ready.

Hmm, what happens when some other non PT events are in the same perf record?
And those maybe run at different times than PT (e.g. due to some PT specific
filter).  Does this all work correctly then?

-Andi