linux-kernel - Re: [PATCH -v2 1/2] ratelimit: Extend to print suppressed messages on release

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Date:	Wed, 29 Jun 2016 03:24:44 -0700
From:	Joe Perches <joe@...ches.com>
To:	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, Franck Bui <fbui@...e.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -v2 1/2] ratelimit: Extend to print suppressed messages
 on release

On Wed, 2016-06-29 at 11:56 +0200, Borislav Petkov wrote:
> From: Borislav Petkov <bp@...e.de>
> 
> Extend the ratelimiting facility to print the amount of suppressed lines
> when it is being released.
> 
> Separated from a previous patch by Linus.
[]
> diff --git a/include/linux/ratelimit.h b/include/linux/ratelimit.h
[]
> @@ -15,6 +19,7 @@ struct ratelimit_state {
>  	int		printed;
>  	int		missed;
>  	unsigned long	begin;
> +	unsigned long	flags;
>  };

There are a lot of ratelimit_state structs used in the kernel.
Every printk like <foo>_ratelimited uses a static one.

It'd likely be better to reduce the struct ratelimit_state
size rather than expand it.

burst and printed could probably become s16 or even s8.
flags could be u8 until necessary to expand.