linux-kernel - [RFC Patch 0/1] Enhancements to 'trace' infrastructure

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Date:	Tue, 15 Apr 2008 16:44:59 +0530
From:	"K. Prasad" <prasad@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	dwilder@...ibm.com, mathieu.desnoyers@...ymtl.ca, hunt@...hat.com
Subject: [RFC Patch 0/1] Enhancements to 'trace' infrastructure

Hi All,
	Please review the following patch which introduces two new
interfaces to output data using 'trace' infrastructure. These interfaces
can be used to print directly onto a debugfs mount. Since it uses 'trace'
interface underneath the directory and file structures are as created by
'trace'.

The proposed debugfs_* interfaces are meant to overcome the need to
setup/tear-down 'trace' infrastructure by the user. In addition to this
the patches help in:

a) Printing out data into a debugfs mounted file without bothering about
creating/re-using debugfs files, sizes of intermediate buffers, etc.
(This is achieved through the functions init_trace_interface() and
trace_exists()).
b) Provide interfaces to do i)string output or ii)binary dump of data
c) Tear-down of the trace infrastructure through a single function call
using its parent directory name, and unmindful of the internal data
structures such as 'struct trace_info'.(using trace_cleanup_all)
d) The debugfs_printk_data may be further enhanced to provide features
suh as the ability to invoke pre- and post- printing callback functions
For e.g. A callback function to obtain a given lock before printing out
a given data, etc.

A quick look at samples/trace/fork_trace.c would help understand what is
required to get data out using the 'trace' infrastructure (vs the
proposed interfaces which have been exemplified in
samples/trace/fork_new_trace.c).

The patches are based against 2.6.25-rc8-mm1 and have been tested on an
i386 machine.

Thanks,
K.Prasad

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