linux-kernel - Re: [PATCH 00/12 v2] ring-buffer/tracing: Remove disabling of ring buffer while reading trace file

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Message-ID: <20200327103046.08f06131@gandalf.local.home>
Date:   Fri, 27 Mar 2020 10:30:46 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        "Alexei Starovoitov" <alexei.starovoitov@...il.com>,
        Peter Wu <peter@...ensteyn.nl>,
        Jonathan Corbet <corbet@....net>,
        Tom Zanussi <zanussi@...nel.org>,
        "Shuah Khan" <shuahkhan@...il.com>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH 00/12 v2] ring-buffer/tracing: Remove disabling of ring
 buffer while reading trace file

On Fri, 27 Mar 2020 10:07:00 +0000
David Laight <David.Laight@...LAB.COM> wrote:

> > If needed, I can add a kernel command line option and a Kconfig that
> > makes this set to true by default.  
> 
> Maybe a different file 'trace_no_pause' ?

I rather not add another file, it adds more complexity, and confuses the
interface even more. I'll leave this as is.

> Along with the one that lets you read the raw trace and get EOF.

Can you explain this more? I think we talked about this before, but I don't
remember the details.

-- Steve