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

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Message-ID: <20230818094128.7cf1d58b@gandalf.local.home>
Date:   Fri, 18 Aug 2023 09:41:28 -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 Fri, 18 Aug 2023 14:03:09 +0900
Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:

> Looks good to me. 
> 
> Reviewed-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> BTW, this reminds me that splice read support had been introduced for
> virtio-trace support. I've tested it with/without this patch, but I hit
> a different issue, which seems like a virtio-serial issue (per-cpu buffers
> on the guest are spliced correctly, but the data can not be read from host
> side). Let me investigate it.

Is virtio-trace using trace_pipe or trace_pipe_raw? Those two are handled
differently.

-- Steve