lkml.org 
[lkml]   [2005]   [Aug]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectAnother libata TODO item

Difficulty: beginner / intermediate

Modern network drivers have a per-NIC list of debugging messages that
can be enabled/disabled at runtime, implemented as a bitmask named
'msg_enable' in each driver. VERY useful for tracing specific events
during debugging. grep for 'msg_enable', 'netif_msg_', and 'NETIF_MSG_'.

To make libata debugging easier and more fine-grained, we should convert
DPRINTK/VPRINTK calls in libata to code that looks like

if (ata_msg_xxx(ap->msg_enable))
printk(...)
The task involves:

* reviewing net driver msg_enable usage
* reviewing original netif_msg documentation by Donald Becker, at
(scroll down)
http://www.scyld.com/pipermail/vortex/2001-November/001426.html

* designing a sliding scale of ever-more-verbose classes of messages,
for libata and libata drivers
* design a method by which userspace may change the per-port msg_enable
variable in libata

* implement the sliding scale as ATA_MSG_xxx / ata_msg_xxx()
* add msg_enable to struct ata_port
* implement method of setting ap->msg_enable via userspace
* convert messages in libata-core/libata-scsi
* convert messages in each driver
* add 'debug' module option to each driver, in a manner that duplicates
net driver module options
* test!


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-08-24 08:20    [from the cache]
©2003-2011 Jasper Spaans