svn commit: r209220 - projects/ppc64/sys/powerpc/aim
alc at cs.rice.edu
Sun Jun 20 17:51:47 UTC 2010
Nathan Whitehorn wrote:
> Author: nwhitehorn
> Date: Tue Jun 15 21:46:07 2010
> New Revision: 209220
> URL: http://svn.freebsd.org/changeset/base/209220
> Implement a page table spilling mechanism to allow the kernel to continue
> when user-space applications have filled all the slots in a PTEG. This
> relies on VM gracefully remapping pages when it gets faults on pages
> it thinks are mapped already, which it seems to do in limited
> forkbomb-based testing.
> Comments by alc appreciated before merging to HEAD.
As long the mapping requested of pmap_enter() is valid upon return from
that function, a pmap implementation is allowed to destroy any other
mappings to pageable pages, i.e., pages and mappings that aren't wired,
at any time. So, based upon the above description, I don't think that
you are doing anything inappropriate.
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