Re: [PATCH v2 01/21] libtracefs: Added new API tracefs_sql()

From: Lukas Bulwahn
Date: Tue Aug 03 2021 - 03:27:58 EST

On Tue, Aug 3, 2021 at 6:23 AM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>
> 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 = 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.