如何监控哪些文件使用iops?

I need to understand which files consumes iops of my hard disc. Just using "strace" will not solve my problem. I want to know, which files are really written to disc, not to page cache. I tried to use "systemtap", but I cannot understand how to find out which files (filenames or inodes) consumes my iops. Is there any tools, which will solve my problem?I need to understand which files consumes iops