On Thu, 06 Mar 2014 15:52:11 +0530, pravin jadav said: > i want to develop a kernel module that will scan page cache and find the > pfn of those pages that have a same content in cache and in secondary > storage like physical disk, so please give me some idea how should i start > to develop kernel module What problem are you trying to solve by doing this? (Hint - how do you know what the copy in secondary storage contains, without reading it in?) Also, note that it's quite possble that there *is* no valid secondary storage copy of a page (particularly between when a file is created, and the first writeback of a page, but there's other instances as well). Plus there's lots of race conditions. Just checking the 'dirty' bit for the page that says whether a writeback is needed may or may not be the right answer, depending on what it is you';re actually trying to do....
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