On Tue, Feb 28, 2012 at 2:50 AM, Mulyadi Santosa <mulyadi.santosa@gmail.com> wrote:
On Mon, Feb 27, 2012 at 20:41, Jack David <jd6589@gmail.com> wrote:
Hi All,
I am trying to replace a page which is already present in page_cache. Is there any direct way to do so (via some kernel API)? My experiment is something like, I have a file opened and read completely in user space app (just to make sure that all the file is present in page cache). From kernel, I am allocating a new page, filling some data into it, and want to store this data by replacing some existing page from page_cache.
sounds like what you want to do is like normal mmap in user space and then write new data into it?
Actually I want to share the pages (present in page cache) between two files. I want to avoid memcopy in kernel as much as possible. I am going through the mmap implementation in kernel but not able to understand how it can help me in my scenario. J