linux-kernel - Re: [PATCH v2] tracing: Introduce pipe_cpumask to avoid race on trace

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Message-ID: <20230820223301.1a013170@rorschach.local.home>
Date:   Sun, 20 Aug 2023 22:33:01 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc:     Zheng Yejian <zhengyejian1@...wei.com>, <laijs@...fujitsu.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-trace-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] tracing: Introduce pipe_cpumask to avoid race on
 trace_pipes

On Mon, 21 Aug 2023 11:19:54 +0900
Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:

> Ah, this caused a drop. errno can be EAGAIN even if rlen > 0.
> I've fixed this and that works.
> BTW, I think this virtio-trace would be better to move under
> tools/tracing because it is a tracing tool.

I'm fine with that, as where it is, I'm very unfamiliar with this tool.
It is likely not taking advantage of all the tracing tooling we
have. I actually never even used it.

-- Steve