linux-kernel - Re: [PATCH v7 02/13] user_events: Add minimal support for trace

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Message-ID: <20211213114816.782e8504@gandalf.local.home>
Date:   Mon, 13 Dec 2021 11:48:16 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Beau Belgrave <beaub@...ux.microsoft.com>,
        linux-trace-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 02/13] user_events: Add minimal support for
 trace_event into ftrace

On Mon, 13 Dec 2021 09:09:15 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> > > Steve, can we write such a big event data on the trace buffer?  
> > 
> > In the future yes!
> > 
> >   https://lore.kernel.org/all/20211125175253.186422-1-tz.stoyanov@gmail.com/  
> 
> Ah, nice!
> 
> > 
> > But it will still require some configuration changes from user space. But
> > that said, if the user wants to add a larger size, then they can do so (in
> > the future).  
> 
> Hmm, so, at this moment I recommend to pick the max size of the event
> smaller than page size but enough large (e.g. 1024, that is finally Beau
> has chosen).
> And after that new ring buffer introduced, expand it.
> What would you think?

I'm fine with that.

-- Steve