A page ofĭata that is unwritten doesn't have to exist. Store doesn't even need swap (because the file is the backing store).Ī page of code that is shared - may become a page of code that is private. Not need to be used until the data is read (or written). The mmap() call can map a file (backing store) and allow data to be shared. "copy-on-write" pages - an mmap'ed file may be very large in the process address space, but empty until written to.To see information on different methods of getting more accurate memory information, Sufficient information about the true state of the system. Many of the memory reporting mechanisms for the kernel are inaccurate, due to not recording Inaccuracies of kernel reporting mechanisms Here is the result of running mem_usage on the process used in the previous example: See 'man proc' for detailed information about the files and fields in the /proc filesystem.
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