linux-kernel - Re: [PATCH v2 1/3] tracing: Rename `eval_map_wq` and export it for asynchronous use by other modules

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Message-ID: <5b9016cf-ccec-463e-acad-fb95c08c7602@kylinos.cn>
Date: Tue, 27 Jan 2026 09:23:59 +0800
From: Yaxiong Tian <tianyaxiong@...inos.cn>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: axboe@...nel.dk, mhiramat@...nel.org, mathieu.desnoyers@...icios.com,
 linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] tracing: Rename `eval_map_wq` and export it for
 asynchronous use by other modules


在 2026/1/26 22:36, Steven Rostedt 写道:
> On Mon, 26 Jan 2026 10:43:16 +0800
> Yaxiong Tian <tianyaxiong@...inos.cn> wrote:
>
> Hi,
>
> Some of your terminology is a little confusing. The subject says "modules"
> but no module will use it (the term module means loadable code at runtime
> into the Linux kernel). A better subject would be:
>
>
>    tracing: Rename `eval_map_wq` and allow other parts of tracing use it
>
>
>> The eval_map_work_func() function, though queued in eval_map_wq,
>> holds the trace_event_sem read-write lock for a long time during
>> kernel boot. This causes blocking issues for other functions.
>>
>> Rename eval_map_wq to trace_init_wq and export it, thereby allowing
> Also saying "export" for a function means something like "EXPORT_SYMBOLE()"
> which again deals with Linux modules. A better term is "make it global".
>
>> other modules to schedule work on this queue asynchronously and
>   .. other parts of tracing ..
>
>> avoiding blockage of the main boot thread.
>>
>> Signed-off-by: Yaxiong Tian <tianyaxiong@...inos.cn>
> Other than that, this patch looks good.
>
> -- Steve

    Yes, those statements were not quite accurate. I have addressed them
    in Version 3.