Re: I/O tracing

You can use either dprobes to set up a tracepoint dynamically anywhere you
please see:
http://oss.software.ibm.com/developerworks/opensource/linux/projects/dprobes

Or, you can use gkhi to define a hook anywhere in the kernel you please.
You can write a hook exit as a kmod to do whatever you fancy and have it
activate at a tome of your choosing. See,
http://oss.software.ibm.com/developerworks/opensource/linux/projects/gkhi

Or, you can investigate some of the standard tracepoint Linux Trace Toolkit
creates, see: http://www.opersys.com/

And that's only three of many....

Richard Moore -  RAS Project Lead - Linux Technology Centre (ATS-PIC).
http://oss.software.ibm.com/developerworks/opensource/linux
Office: (+44) (0)1962-817072, Mobile: (+44) (0)7768-298183
IBM UK Ltd,  MP135 Galileo Centre, Hursley Park, Winchester, SO21 2JN, UK

"YU,SAMMY (HP-Roseville,ex1)" <[e-mail]> on 04/06/2001 19:37:23

Please respond to "YU,SAMMY (HP-Roseville,ex1)" <[e-mail]>

To:   [e-mail]
cc:
Subject:  I/O tracing

Hi,
     Please CC me as I'm not subscribed on the list, thanks.  Not sure if
this is appropriate forum, is there an existing tool/module for capturing
all the I/O requests such as:

Unique Identifier
Start Time
End Time
Device Identifier
Operation Type (Read Or Write)
Offset
Length (Number Of Bytes)

I am aware of existing /proc/disks and partitions, but these aren't real
time.  If not, are there any facilities in the kernel I can put a hook in
to
keep track of the I/O?

Thanks in advance,
Sammy Yu
Hewlett-Packard