linux-ext4 - Re: [PATCH 2/9] ext4: Use pr_fmt and pr

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Date:	Mon, 19 Mar 2012 11:46:13 -0700
From:	Joe Perches <joe@...ches.com>
To:	Ted Ts'o <tytso@....edu>
Cc:	David Miller <davem@...emloft.net>, anca.emanuel@...il.com,
	adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/9] ext4: Use pr_fmt and pr_<level>

On Mon, 2012-03-19 at 14:31 -0400, Ted Ts'o wrote:
> On Mon, Mar 19, 2012 at 02:14:02PM -0400, David Miller wrote:
> I've *already* gone far beyond the pr_fmt standardization, with the
> ext4_msg() and ext4_error() system

Please note the defects that were recently corrected there
which occurred because of a lack of standardization both
in prefix and termination style.

> One of the other reasons why I don't like the pr_* system because it
> doesn't go far enough for the pain that's involved with making such a
> change pervasively across the entire kernel.

Any logging system, with or without an external notification
mechanism, will be painful.  pr_<foo> is at least a small
start.  I'd like to see a notification mechanism, perhaps ala
netlink/ethtool to extend pr_<foo> or another call.  A lot of
these printk/pr_<level> uses really could generate notifications.

> What I'd really like to
> see is a system that allows for semi-structured logging --- where
> structured data such as the block device involved, whether it's at a
> device driver driver, block layer, cfq or proportional I/O layer, or
> file system layer, was consistently named, and squirted out a high
> efficiency interface such as netlink or an ftrace ring buffer.

Yay, we agree.

cheers, Joe

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