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    SubjectRe: Swap
    Christopher Friesen wrote:
    >
    > "Richard B. Johnson" wrote:
    > >
    > > On Tue, 20 Nov 2001, Wolfgang Rohdewald wrote:
    > >
    > > > On Tuesday 20 November 2001 15:51, J.A. Magallon wrote:
    > > > > When a page is deleted for one executable (because we can re-read it from
    > > > > on-disk binary), it is discarded, not paged out.
    > > >
    > > > What happens if the on-disk binary has changed since loading the program?
    > > > -
    > >
    > > It can't. That's the reason for `install` and other methods of changing
    > > execututable files (mv exe-file exe-file.old ; cp newfile exe-file).
    > > The currently open, and possibly mapped file can be re-named, but it
    > > can't be overwritten.
    >
    > Actually, with NFS (and probably others) it can. Suppose I change the file on
    > the server, and it's swapped out on a client that has it mounted. When it swaps
    > back in, it can get the new information.
    >

    This sounds really dangerous... What about shared libraries ??

    Regards,
    --
    Steffen Persvold | Scalable Linux Systems | Try out the world's best
    mailto:sp@scali.no | http://www.scali.com | performing MPI implementation:
    Tel: (+47) 2262 8950 | Olaf Helsets vei 6 | - ScaMPI 1.12.2 -
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