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Added link to kmemsize
== Introduction ==
User pages is the second importaint resource (after [[kmemsize]]) which must be accounted.
Despite kernel memory, which is either used or not, the set of user pages may have different classifications. Pages may be backed by file, locked, unused, i.e. requesed with mmap/brk but not yet touched and so on. Thus user pages accounting is trickier that kernel pages' one.
