Messages in this thread | | | Date | Mon, 27 Apr 2009 15:34:21 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH 5/5] add ksm kernel shared memory driver. |
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On Mon, 20 Apr 2009 04:36:06 +0300 Izik Eidus <ieidus@redhat.com> wrote:
> Ksm is driver that allow merging identical pages between one or more > applications in way unvisible to the application that use it. > Pages that are merged are marked as readonly and are COWed when any > application try to change them.
Breaks sparc64 and probably lots of other architectures:
mm/ksm.c: In function `try_to_merge_two_pages_alloc': mm/ksm.c:697: error: `_PAGE_RW' undeclared (first use in this function)
there should be an official arch-independent way of manipulating vma->vm_page_prot, but I'm not immediately finding it.
An alternative (and quite inferior) "fix" would be to disable ksm on architectures which don't implement _PAGE_RW. That's most of them.
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