Date: Mon, 31 Aug 2009 17:42:52 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/i386/i386 pmap.c src/sys/i386/include pmap.h Message-ID: <200908311743.n7VHhG8M023028@repoman.freebsd.org>
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jhb 2009-08-31 17:42:52 UTC
FreeBSD src repository
Modified files:
sys/i386/i386 pmap.c
sys/i386/include pmap.h
Log:
SVN rev 196705 on 2009-08-31 17:42:52Z by jhb
Improve pmap_change_attr() so that it is able to demote a large (2/4MB)
page into 4KB pages as needed. This should be fairly rare in practice
on i386. This includes merging the following changes from the amd64 pmap:
180430, 180485, 180845, 181043, 181077, and 196318.
- Add basic support for changing attributes on PDEs to pmap_change_attr()
similar to the support in the initial version of pmap_change_attr() on
amd64 including inlines for pmap_pde_attr() and pmap_pte_attr().
- Extend pmap_demote_pde() to include the ability to instantiate a new page
table page where none existed before.
- Enhance pmap_change_attr(). Use pmap_demote_pde() to demote a 2/4MB page
mapping to 4KB page mappings when the specified attribute change only
applies to a portion of the 2/4MB page. Previously, in such cases,
pmap_change_attr() gave up and returned an error.
- Correct a critical accounting error in pmap_demote_pde().
Reviewed by: alc
MFC after: 3 days
Revision Changes Path
1.647 +177 -52 src/sys/i386/i386/pmap.c
1.141 +4 -0 src/sys/i386/include/pmap.h
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