Date: Fri, 21 May 2004 21:53:52 -0700 (PDT) From: Alan Cox <alc@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/vm vm_extern.h vm_fault.c vm_map.c vm_page.c Message-ID: <200405220453.i4M4rq8P085834@repoman.freebsd.org>
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alc 2004/05/21 21:53:52 PDT
FreeBSD src repository
Modified files:
sys/vm vm_extern.h vm_fault.c vm_map.c vm_page.c
Log:
To date, unwiring a fictitious page has produced a panic. The reason
being that PHYS_TO_VM_PAGE() returns the wrong vm_page for fictitious
pages but unwiring uses PHYS_TO_VM_PAGE(). The resulting panic
reported an unexpected wired count. Rather than attempting to fix
PHYS_TO_VM_PAGE(), this fix takes advantage of the properties of
fictitious pages. Specifically, fictitious pages will never be
completely unwired. Therefore, we can keep a fictitious page's wired
count forever set to one and thereby avoid the use of
PHYS_TO_VM_PAGE() when we know that we're working with a fictitious
page, just not which one.
In collaboration with: green@, tegge@
PR: kern/29915
Revision Changes Path
1.73 +2 -2 src/sys/vm/vm_extern.h
1.188 +10 -11 src/sys/vm/vm_fault.c
1.335 +13 -5 src/sys/vm/vm_map.c
1.284 +4 -0 src/sys/vm/vm_page.c
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