>On Thursday 05 April 2007, Avi Kivity wrote: >> > arch/s390/mm/extmem.c has another very interesting concept, though the >> > hcall interfaces used there are not as flexible as they should be in >> > kvm. It's basically about mapping host files into the guest real >address >> > space, e.g. for shared memory between guests. >> > >> >> This, too, is interesting, though it means guest apps need to be written >> to take advantage of it. > >The primary user of this interface is the ext2 file system with the -oxip >mount option that can easily share read-only file systems across guests >without actually copying files into the page cache of each guest.
That's nice. Thanks for the tip. > >Another potential (future) user are cluster file systems like ocfs2 and >gfs2, but to be really efficient, these also need a specialized distributed >lock manager that communicates through hcalls instead of TCP/IP networking. > >Simply mapping the shared memory as a character device is similar enough >that applications written for posix shared memory can easily be adapted, >but I'm not aware of anyone doing that currently. > > Arnd <>< ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
