linux-kernel - Re: [POC][RFC][PATCH 0/3] tracing: Add perf events to trace buffer

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Message-ID: <20251118085324.32816807@gandalf.local.home>
Date: Tue, 18 Nov 2025 08:53:24 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Steven Rostedt <rostedt@...nel.org>, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Andrew Morton
 <akpm@...ux-foundation.org>, Peter Zijlstra <peterz@...radead.org>, Thomas
 Gleixner <tglx@...utronix.de>, Ian Rogers <irogers@...gle.com>, Namhyung
 Kim <namhyung@...nel.org>, Arnaldo Carvalho de Melo <acme@...nel.org>, Jiri
 Olsa <jolsa@...nel.org>, Douglas Raillard <douglas.raillard@....com>
Subject: Re: [POC][RFC][PATCH 0/3] tracing: Add perf events to trace buffer

On Tue, 18 Nov 2025 17:11:47 +0900
Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:

> > > echo "perf:my_counter=pmu/config=M,config1=N" >> /sys/kernel/tracing/trigger  
> > 
> > Still need a way to add an identifier list. Currently, if the size of
> > the type identifier is one byte, then it can only support up to 256 events.  
> 
> Yes, so if user adds more than that, it will return -ENOSPC.

The issue is that the ids are defined by what is possible, not by what the
user enables.

-- Steve