Date: Sat, 9 Jun 2001 09:51:42 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: Alfred Perlstein <bright@rush.net> Cc: Peter Wemm <peter@wemm.org>, tlambert2@mindspring.com, "Patrick W. Penzias Dirks" <pwd@apple.com>, FreeBSD-FS@FreeBSD.ORG, FreeBSD-Arch@FreeBSD.ORG Subject: Re: Support for pivot_root-like system call? Message-ID: <200106091651.f59GpgF07875@earth.backplane.com> References: <3B2096AB.309B2D14@mindspring.com> <20010608153011.D7AF1380C@overcee.netplex.com.au> <20010608130128.E1832@superconductor.rush.net>
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:The cache coherency bugs are not fixed for all cases, being able to
:ask the underlying filesystem for the vm_object does not solve the
:problem.
:
:What if i have a stacking layer where each page alternates
:between two files that i'm stacked on top of?
:
:Passing the vm_object back doesn't work for this. Unless something
:else has been done.
:
:-Alfred Perlstein [alfred@freebsd.org]
Well, I suppose a vm_map would solve this, though for the specific
alternating case (or a RAID configuration of some sort) it would be
really expensive to do with a vm_map. We would need some kind of
synthesized translation capability in the vm_map to make it efficient.
-Matt
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