> On Mon, 2007-03-12 at 19:23 +0300, Kirill Korotaev wrote: > >>For these you essentially need per-container page->_mapcount counter, >>otherwise you can't detect whether rss group still has the page in question >>being mapped >>in its processes' address spaces or not. > > > What do you mean by this? You can always tell whether a process has a > particular page mapped. Could you explain the issue a bit more. I'm > not sure I get it. When we do charge/uncharge we have to answer on another question: "whether *any* task from the *container* has this page mapped", not the "whether *this* task has this page mapped".
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