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SubjectRe: Swap


On Tue, 20 Nov 2001, Richard B. Johnson wrote:

> On Tue, 20 Nov 2001, 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.
> >
> > Chris
>
> I note that NFS files don't currently return ETXTBSY, but this is a bug.
> It is 'known' to the OS that the NFS mounted file-system is busy because
> you can't unmount the file-system while an executable is running. If
> you can trash it (as you can on Linux), it is surely a bug.
>
In most of the cases, the process on the client simply dies....



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