From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Zheng Yejian <zhengyejian1@huawei.com>, <laijs@cn.fujitsu.com>,
<linux-kernel@vger.kernel.org>,
<linux-trace-kernel@vger.kernel.org>
Subject: Re: [PATCH v2] tracing: Introduce pipe_cpumask to avoid race on trace_pipes
Date: Fri, 18 Aug 2023 23:23:01 +0900 [thread overview]
Message-ID: <20230818232301.902ad9319569379ebd7df557@kernel.org> (raw)
In-Reply-To: <20230818094128.7cf1d58b@gandalf.local.home>
On Fri, 18 Aug 2023 09:41:28 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:
> On Fri, 18 Aug 2023 14:03:09 +0900
> Masami Hiramatsu (Google) <mhiramat@kernel.org> wrote:
>
> > Looks good to me.
> >
> > Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.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.
It uses trace_pipe_raw. I guess if splice(from trace_pipe_raw to virtio-serial)
returns -1 and errno == EAGAIN, the trace data will be lost?
Thank you,
>
> -- Steve
--
Masami Hiramatsu (Google) <mhiramat@kernel.org>
next prev parent reply other threads:[~2023-08-18 14:23 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-10 12:39 [PATCH] tracing: Fix race when concurrently splice_read trace_pipe Zheng Yejian
2023-08-11 11:42 ` Masami Hiramatsu
2023-08-11 12:37 ` Zheng Yejian
2023-08-11 19:24 ` Steven Rostedt
2023-08-12 2:22 ` Zheng Yejian
2023-08-12 21:08 ` Steven Rostedt
2023-08-16 19:23 ` Steven Rostedt
2023-08-17 11:50 ` [RFC PATCH] tracing: Introduce pipe_cpumask to avoid race on trace_pipes Zheng Yejian
2023-08-17 14:13 ` Steven Rostedt
2023-08-18 1:38 ` Zheng Yejian
2023-08-18 1:43 ` Steven Rostedt
2023-08-18 2:26 ` [PATCH v2] " Zheng Yejian
2023-08-18 5:03 ` Masami Hiramatsu
2023-08-18 13:41 ` Steven Rostedt
2023-08-18 14:23 ` Masami Hiramatsu [this message]
2023-08-18 15:53 ` Steven Rostedt
2023-08-19 1:42 ` Masami Hiramatsu
2023-08-20 13:18 ` Masami Hiramatsu
2023-08-21 2:19 ` Masami Hiramatsu
2023-08-21 2:33 ` Steven Rostedt
2023-08-21 9:21 ` Masami Hiramatsu
2023-08-21 15:17 ` Steven Rostedt
2023-08-21 22:32 ` Masami Hiramatsu
2023-08-11 19:25 ` [PATCH] tracing: Fix race when concurrently splice_read trace_pipe Steven Rostedt
2023-08-12 1:45 ` Zheng Yejian
2023-08-12 20:47 ` Masami Hiramatsu
2023-08-12 7:38 ` Zheng Yejian
2023-08-13 1:13 ` Steven Rostedt
2023-08-13 16:41 ` Linus Torvalds
2023-08-14 20:16 ` Steven Rostedt
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