You could easily get some traces on I/O block devices access using the blktrace Linux framework:

http://linux.die.net/man/8/blktrace

If instead you are interested on performances evaluation of kernel side code, you should go with performance counters using Perf:

https://perf.wiki.kernel.org/index.php/Main_Page

An overall review and a set of pointers on other interesting Linux tracing tools could be found on this webpage:

http://elinux.org/Kernel_Trace_Systems

Thanks for your answer, I already know the three precious links you gave, My question was not clear enough, sorry. I was looking for some "reference" embedded system IO traces like the ones we find in the SNIA page (iotta) for servers. For instance some projects on smartphone (android ?) I/O traces and stuff like that. Do you know any ?. We already use blktrace, and we developped a flash specific monitor named Flashmon (se link below).Thanks for your previous (and may be future) answer.

http://sourceforge.net/projects/flashmon/

Have you considered the idea to generate traces by yourself, for example using blk_trace and a properly crafted MonkeyRunner script to control the Android borwser? Browsing could produce a lot of caching, thus allowing you to generate a properly set of traces corresponding to the visit of some of the top ranked websites.

If instead you are looking for a sort of "benchmark traces", than I'm sorry but I don't know how to help.

Yes I am looking for a "reference" trace ot benchmark, but since I do not find one, I guess we will generate our own traces.

I appreciate your answers, thanks.