linux-kernel - Re: [PATCH 2/2] printk: Make the console flush configurable in hotplug path

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Date:   Thu, 24 Sep 2020 15:38:59 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Prasad Sodagudi <psodagud@...eaurora.org>
Cc:     rostedt@...dmis.org, pmladek@...e.com,
        sergey.senozhatsky@...il.com, gregkh@...uxfoundation.org,
        tglx@...utronix.de, linux-kernel@...r.kernel.org, tkjos@...gle.com,
        Mohammed Khajapasha <mkhaja@...eaurora.org>
Subject: Re: [PATCH 2/2] printk: Make the console flush configurable in
 hotplug path

On (20/09/23 17:08), Prasad Sodagudi wrote:
> From: Mohammed Khajapasha <mkhaja@...eaurora.org>
> 
> The thread which initiates the hot plug can get scheduled
> out, while trying to acquire the console lock,
> thus increasing the hot plug latency. This option
> allows to selectively disable the console flush and
> in turn reduce the hot plug latency.

It can schedule out or get preempted pretty much anywhere at any
time. printk->console_lock is not special in this regard. What am
I missing?

	-ss