On Llu, 2005-05-16 at 06:45, Mark McLoughlin wrote: > On Sun, 2005-05-15 at 13:57 -0500, William Lovaton wrote: > > > Reading your little chat with the kernel guys it seems that there is > > little benefit (or none) in reducing VM Size, why is that? > > Because the kernel won't back this mapping with physical memory until > the application actually tries to use it - i.e. only when the app tries > to write to any these pages does the kernel get a page fault and
There is a cost if the mapping has just a few random pages filled as you have to fill in the whole page table heirarchy down to the page in question. It will also hurt you badly on a system running with overcommit disabled as is often done on server systems. In overcommit disable modes you must have enough swap + 50% of ram to back all virtual address space allocated (so that all out of memory is reliably detected). Gnome currently runs ok in that mode although evolution 2.* didn't last time I tried it. Alan _______________________________________________ desktop-devel-list mailing list [email protected] http://mail.gnome.org/mailman/listinfo/desktop-devel-list
