linux-ext4 - Re: [RFC 16/16] ext4: Add process name and pid in ext4

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Message-ID: <20200521182650.GC2946569@mit.edu>
Date:   Thu, 21 May 2020 14:26:50 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>
Cc:     linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Jan Kara <jack@...e.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>
Subject: Re: [RFC 16/16] ext4: Add process name and pid in ext4_msg()

On Sun, May 10, 2020 at 11:54:56AM +0530, Ritesh Harjani wrote:
> This adds process name and pid for ext4_msg().
> I found this to be useful. For e.g. below print gives more
> info about process name and pid.
> 
> [ 7671.131912]  [mount/12543] EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts: acl,user_xattr

I'm not entirely sure about adding the command/pid at the beginning of
the message.  The way we do this in ext4_warning and ext4_err is to
print that information like this:

		printk(KERN_CRIT
		       "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
		       sb->s_id, function, line, current->comm, &vaf);

... and I wonder if it would make more sense to add something like to
ext4_msg(), just out of consistency's sake.  Which of the debugging
messages were you finding this to be most helpful?

	      	  	       	     - Ted