[Pvfs2-developers] Linux block device layer actions.

[Julian Martin Kunkel]

Hi,
between linux 2.6.16 and 2.6.17 a new kernel option has been integrated into 
the kernel (kernel help):
CONFIG_BLK_DEV_IO_TRACE:                                                                         
Say Y here, if you want to be able to trace the block layer actions                               
on a given queue. Tracing allows you to see any traffic happening                                  
on a block device queue. For more information (and the user space                                 
support tools needed), fetch the blktrace app from:                                               
git://brick.kernel.dk/data/git/blktrace.git

I tried it out in the morning. This tool is easy to use and looks promising in 
order to show whats happening on the block layer. However, I'm not sure how 
we can use this information for performance analysis efficiently, yet.

Julian