Date: Sun, 20 Jun 2010 12:29:53 -0500 From: Alan Cox <alc@cs.rice.edu> To: Nathan Whitehorn <nwhitehorn@FreeBSD.org> Cc: svn-src-projects@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r209220 - projects/ppc64/sys/powerpc/aim Message-ID: <4C1E5011.1030509@cs.rice.edu> In-Reply-To: <201006152146.o5FLk79o002713@svn.freebsd.org> References: <201006152146.o5FLk79o002713@svn.freebsd.org>
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Nathan Whitehorn wrote: > Author: nwhitehorn > Date: Tue Jun 15 21:46:07 2010 > New Revision: 209220 > URL: http://svn.freebsd.org/changeset/base/209220 > > Log: > 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. Regards, Alan
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