linux-kernel - Re: [PATCH v5] ramoops: use pstore interface

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Message-ID: <4F83F08E.6070304@gmail.com>
Date:	Tue, 10 Apr 2012 10:34:22 +0200
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	"Luck, Tony" <tony.luck@...el.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	"shuahkhan@...il.com" <shuahkhan@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5] ramoops: use pstore interface

Il 09/04/2012 23:42, Luck, Tony ha scritto:
>> The patch breaks ramoops module unloading.  Tony says there's "no
>> credible end-user case" for this and Marco promptly provided one,
>> which was ignored.
>
> I'm not sure that I understood Marco's use case. He said:
>
>> First of all ramoops was born mainly for debug purpose and
>> to help the maintainability of a product. I used it in systems
>> where the uptime (so no reboot) was important. So it can be
>> very useful for me load the module, gather logs and unload it
>> for example. A kernel panic is not recoverable so the reboot
>> is needed but it's not always true for a kernel oops.
>
> In the non-crashed oops case ... aren't all the logs you need
> in /var/log/messages?
>
> -Tony

Maybe you right, but it could be useful to have a "single log point" 
especially for automatic/semi-automatic log gathering. I'm not sure we 
can *always* read from messages in case of non-crashed oops. Sure, it 
will be possible after a reboot, but if /var was mounted with tmpfs (on 
embedded systems it's possible :)) we have no log.

PS: It's only a brainstorming on all the possible situation :)

Marco
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