linux-kernel - Re: [PATCH v5 15/15] tracing: Update subbuffer with kilobytes not page order

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Message-ID: <20231220205705.64de0424@gandalf.local.home>
Date: Wed, 20 Dec 2023 20:57:05 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: 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>, Tzvetomir Stoyanov <tz.stoyanov@...il.com>,
 Vincent Donnefort <vdonnefort@...gle.com>, Kent Overstreet
 <kent.overstreet@...il.com>
Subject: Re: [PATCH v5 15/15] tracing: Update subbuffer with kilobytes not
 page order

On Thu, 21 Dec 2023 09:26:21 +0900
Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:

> > If the user specifies 3 via:
> > 
> >   echo 3 > buffer_subbuf_size_kb
> > 
> > Then the sub-buffer size will round up to 4kb (on a 4kb page size system).
> > 
> > If they specify:
> > 
> >   echo 6 > buffer_subbuf_size_kb
> > 
> > The sub-buffer size will become 8kb.  
> 
> I think this is better interface. Can we apply this earlier in the series
> to avoid rewriting the document and test code?

I kept it separate for testing purposes.

Through out all this, it was a good way to make sure the two approaches
were compatible. I still like to keep them separate as that's the way it
was developed. It's good to keep that history.

-- Steve