Messages in this thread |  | | Date | Wed, 21 Nov 2001 00:20:49 +0100 (CET) | From | Luigi Genoni <> | Subject | Re: Swap |
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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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