linux-kernel - Re: [PATCH v2 01/21] libtracefs: Added new API tracefs

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Date:   Tue, 3 Aug 2021 09:27:42 +0200
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-trace-devel@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tom Zanussi <zanussi@...nel.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Clark Williams <williams@...hat.com>,
        Daniel Black <daniel@...ux.ibm.com>
Subject: Re: [PATCH v2 01/21] libtracefs: Added new API tracefs_sql()

On Tue, Aug 3, 2021 at 6:23 AM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
>
> This adds the API tracefs_sql() that takes a tep_handle handler, a name,
> and a SQL string and parses it to produce a tracefs_synth synthetic event
> handler.
>
> Currently it only supports simple SQL of the type:
>
>   SELECT start.common_pid AS pid, end.common_timestamp.usecs AS usecs
>     FROM sched_waking AS start JOIN sched_switch AS end
>     ON start.pid = end.next_pid
>
> Special thanks to:
>
>   Lukas Bulwahn for first introducing the idea at RT Summit on the Summit
>     Spring of 2019.

Thanks, Steven, for putting this idea to life.

I hope that the tracing users appreciate this new declarative
interface using SQL and it makes tracing events easier comprehensible
to a larger community of users.

Lukas