Date: Thu, 7 Mar 2002 12:27:53 -0500 (EST) From: Zhihui Zhang <zzhang@cs.binghamton.edu> To: Alfred Perlstein <bright@mu.org> Cc: freebsd-hackers@freebsd.org Subject: Re: A question of VM page ownership Message-ID: <Pine.SOL.4.21.0203071221360.6679-100000@onyx> In-Reply-To: <20020307164424.GF26621@elvis.mu.org>
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The mapping between data objects (one-to-one or one-to-many) seem to be
the most troublesome stuff to deal with when introducing new data
structures. But if there is never the need to lookup an object from a
page, then maybe we can use a linkage structure like this:
struct vm_page_linkage {
TAILQ_ENTRY(vm_page_linkage) pageq;
struct vm_page * page;
}
-Zhihui
On Thu, 7 Mar 2002, Alfred Perlstein wrote:
> * Zhihui Zhang <zzhang@cs.binghamton.edu> [020307 08:28] wrote:
> >
> > Is there any fundamental reason why a page can not be owned by more than
> > one VM object? If that was the case, the bogus page stuff in vfs_bio.c
> > could be made cleaner IMHO.
>
> There is only enough linkage in the vm page to support it being associated
> with one object. see src/sys/vm/vm_page.h
>
> -Alfred Perlstein [alfred@freebsd.org]
>
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