linux-kernel - Re: [PATCH v4 5/5] blktrace: Make init_blk_tracer() asynchronous when trace_async

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Message-ID: <20260129224520.7f043338@robin>
Date: Thu, 29 Jan 2026 22:45:20 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Yaxiong Tian <tianyaxiong@...inos.cn>
Cc: Jens Axboe <axboe@...nel.dk>, mhiramat@...nel.org,
 mathieu.desnoyers@...icios.com, corbet@....net, skhan@...uxfoundation.org,
 linux-trace-kernel@...r.kernel.org, linux-block@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v4 5/5] blktrace: Make init_blk_tracer() asynchronous
 when trace_async_init set

On Thu, 29 Jan 2026 22:31:16 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> I added the below patch and have this result:
> 
>    kworker/u33:1-79      [002] .....     1.840855: trace_event_update_all: Start syncing
>        swapper/0-1       [005] .....     6.045742: trace_eval_sync: sync maps
>    kworker/u33:1-79      [002] .....    12.289296: trace_event_update_all: Finish syncing
>        swapper/0-1       [005] .....    12.289387: trace_eval_sync: sync maps complete
> 
> Which shows that the final initcall waited for the work queue to complete:

Switching to printk() gives me the same results:

# dmesg |grep sync
[    1.117856] Start syncing
[    4.498360] sync maps
[   11.173304] Finish syncing
[   11.175660] sync maps complete

-- Steve