linux-kernel - Re: [PATCH] printk: tie printk_once / printk_deferred

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Date:   Mon, 15 Apr 2019 11:32:16 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:     linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] printk: tie printk_once / printk_deferred_once into
 .data.once for reset

On (04/12/19 22:11), Paul Gortmaker wrote:
> In commit b1fca27d384e ("kernel debug: support resetting WARN*_ONCE")
> we got the opportunity to reset state on the one shot messages,
> without having to reboot.

Didn't know that.

> However printk_once (printk_deferred_once) live in a different file
> and didn't get the same kind of update/conversion, so they remain
> unconditionally one shot, until the system is rebooted.
> 
> For example, we currently have:
> 
>   sched/rt.c: printk_deferred_once("sched: RT throttling activated\n");
> 
> ..which could reasonably be tripped as someone is testing and tuning
> a new system/workload and their task placements.  For consistency, and
> to avoid reboots in the same vein as the original commit, we make these
> two instances of _once the same as the WARN*_ONCE instances are.

Looks OK to me.

Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

	-ss