linux-kernel - Re: [PATCH] vfs: Add a trace point in the mark_inode

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Date:	Wed, 11 Nov 2009 12:15:35 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	Frederic Weisbecker <fweisbec@...il.com>,
	auke-jan.h.kok@...el.com
Subject: Re: [PATCH] vfs: Add a trace point in the mark_inode_dirty function


* Jeff Garzik <jeff@...zik.org> wrote:

> On 11/11/2009 02:45 AM, Ingo Molnar wrote:
> >
> >* Jeff Garzik<jeff@...zik.org>  wrote:
> >
> >>On 11/11/2009 01:34 AM, Arjan van de Ven wrote:
> >>>Wu Fengguang<fengguang.wu@...el.com>   wrote:
> >>>>Maybe this is enough for POWERTOP, however for general use, the dirty
> >>>>type(data/metadata) and inode number may be valuable to some users?
> >>>
> >>>what can a user do with an inode number????
> >>
> >>Inode numbers have always been visible to userspace...  IIRC, tar(1)
> >>uses the st_ino member of struct stat to detect hard links in certain
> >>cases.  ls(1) displays inode numbers with -i, find(1) looks for them
> >>with -inum, ...
> >
> >Without an inode->vfs-name lookup/matching service it's of limited
> >utility
> 
> Look in the quoted text for one such service...  :)

I'm not sure i understand your point - do you really suggest using 
find(1) to make traces readable?

	Ingo
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