linux-kernel - Re: [RESEND RFC PATCH 0/5] Add a hash value for each line in /dev/kmsg

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Date:	Thu, 25 Jul 2013 09:51:58 -0700
From:	Joe Perches <joe@...ches.com>
To:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Cc:	linux-kernel@...r.kernel.org, yrl.pp-manager.tt@...achi.com,
	akpm@...ux-foundation.org, gregkh@...uxfoundation.org,
	kay@...y.org, davem@...emloft.net, itoukzo@...data.co.jp
Subject: Re: [RESEND RFC PATCH 0/5] Add a hash value for each line in
 /dev/kmsg

On Thu, 2013-07-25 at 17:37 +0900, Hidehiro Kawai wrote:
> ================
> This patch series adds hash values of printk format strings into
> each line of /dev/kmsg outputs as follows:
> 
>         6,154,325061,-,b7db707c@...nel/smp.c:554;Brought up 4 CPUs
> 
> These hash values allow use space to identify messages easily and
> do valuable things.  There is no guarantee that the hash values
> are unique.  However, user space can know which one collides to
> others from a message-and-hash catalog generated at build time, so
> finally it should be able to identify the messages.  User space
> can also use filename:lineno information to do that, although the
> information is not portable among various kernel versions.
> 
> 
> Background
> ==========
> We sometimes want to identify each kernel message automatically
> because of the following purposes:
> 
> (1) Show more detailed information about the message by cooperating
>     with external system
> (2) Take actions automatically depending on the message, for example
>     trigger a fail over or collect related information to analyze the
>     problem

If there are really "take action" uses, perhaps
it'd be better to mark the specific areas of code
where this needs to be done and add a notifier
function there instead of depending on post effect
processing.


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