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

[Steven Rostedt]

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