paging

I'm learning the Linux kernel and reading the book The Linux Kernel . Can anybody explain why can't we just use the table which maps directly between logical and physical memory instead of the tree-like multilevel structure? Added: The total number of entries needed is fixed, so I assume that it's more space wasting to store a complicated structure than a simple one. You will appreciate the space optimization of multi-level page tables when we go into the 64-bit address space. Assume you have a 64-bit computer ( which means 64 bit virtual address space ), which has 4KB pages and 4 GB of

Consider a virtual memory system with a 38-bit virtual byte address, 1KB pages and 512 MB of physical memory. What is the total size of the page table for each process on this machine, assuming that the valid, protection, dirty and use bits take a total of 4 bits, and that all the virtual pages are in use? (assume that disk addresses are not stored in the page table.) Well, if the question is simply "what is the size of the page table?" irrespective of whether it will fit into physical memory, the answer can be calculated thus: First physical memory. There are 512K pages of physical memory

I'm facing with a simple but tedious problem. What I'm trying to do is make an UITableView to page like an UIScrollView but enabling paging doesn't help me so much because I can't set page size so the tableview scrolls exactly of its height so it shows rows 1...10 or 11...20 and so on. What I'd like instead is that no cell remains clipped above or under the view when I scroll (thus paging) without having a sort of fixed range of shown cells. Thanks a lot More simple and more efficient :) - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{ if(decelerate)

I'm newbie in C# programmation and I'm starting creating an application that show me when (real life) "events" expire through ProgressBars. All info. about these events are stored in a Database; So opening a connection to my-sql database I can retrieve all my events. The problem is that I don't know how many events are stored in that database (since in a day I can have 20 events and in another I could have other 40 ones) and my Form1 can't resize itself according the number of events. So, I need to make a page system in order to limit the events printed in each page. Searching on Google and

I realized a JTable with a custom AbstractTableModel for implementing paging. I wanna show 5 item per page, but I've a problem: if I have N item to show (with N which is a multiple of 5) everything it's ok, but if I, for example, have 14 element to show, I get an exception. The problem is that the method for getting each cell value, goes out of bound. In particular the problem is in method public Object getValueAt(int row, int col) { int realRow = row + (pageOffset * pageSize); return data[realRow].getValueAt(col); } in fact, we have 5 row (from 0 to 4) and 14 element, but obviously when we

I have a collection of custom objects in format List of List of T , i.e, a List Of list of custom objects. I need to bind this collection to a datagridview control in windows forms, and the number of pages should be equal to the number of inner lists in the outer list. Each page should bind to inner List, that is, List of T. Any idea how this can be achieved ? Presuming that your nested list has been populated, and in addition to your DataGridView , your form has a Previous and Next button for changing pages: you could use the buttons to change an index which indicates which nested list is to

I have a jqgrid where the database table has a few thousand rows, but the jqrid shows only 15 at a time. It should be displaying very quickly (it doesnt take long to query 15 rows). But instead it takes 10 - 20 seconds, which indicates to that it is retrieving the entire table each time. The grid is defined like this: $("#Products").jqGrid({ url: url, mtype: "get", datatype: "json", jsonReader: { root: "Rows", page: "Page", total: "Total", records: "Records", repeatitems: false, userdata: "UserData",id: "Id"}, colNames: ["Product Id","Product Code", ... etc ], colModel: [{ name: "Id", ... etc}