| Date | Sun, 6 Apr 2003 14:35:37 -0700 | From | William Lee Irwin III <> | Subject | Re: objrmap and vmtruncate |
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Andrea Arcangeli <andrea@suse.de> wrote: >>> Esepcially those sigbus in the current api >>> would be more expensive than the regular paging internal to the VM and >>> besides the signal it would generate flood of syscalls and kind of >>> duplication of memory management inside the userspace.
On Sat, Apr 05, 2003 at 05:58:24PM -0800, Andrew Morton wrote: >> That went away. We now encode the file offset in the unmapped ptes, so the >> kernel's fault handler can transparently reestablish the page.
On Sun, Apr 06, 2003 at 04:47:34PM +0200, Andrea Arcangeli wrote: > if you put the file offset in the pte, you will break the max file > offset that you can map, that at least should be recoded with a cookie > like we do with the swap space
IIRC we just restricted the size of the file that can use the things to avoid having to code quite so much up.
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