Date: Tue, 15 Nov 2005 05:54:54 +0000 (UTC) From: Alan Cox <alc@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/i386/i386 pmap.c Message-ID: <200511150554.jAF5ssiH092331@repoman.freebsd.org>
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alc 2005-11-15 05:54:54 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_6)
sys/i386/i386 pmap.c
Log:
MFC revision 1.525
When support for 2MB/4MB pages was added in revision 1.148 an error was
made in pmap_protect(): The pmap's resident count should not be reduced
unless mappings are removed.
The errant change to the pmap's resident count could result in a later
pmap_remove() failing to remove any mappings if the errant change has set
the pmap's resident count to zero.
MFC revision 1.526
Decouple the unrefing of a page table page from the removal of a pv entry.
In other words, change pmap_remove_entry() such that it no longer unrefs
the page table page. Now, it only removes the pv entry.
MFC revision 1.527
Eliminate unneeded diagnostic code.
MFC revision 1.528
Eliminate unneeded diagnostic code.
Eliminate an unused #include. (Kernel stack allocation and deallocation
long ago migrated to the machine-independent code.)
MFC revision 1.529
Simplify the page table page reference counting by pmap_enter()'s change of
mapping case.
Eliminate a stale comment from pmap_enter().
MFC revision 1.530
When pmap_allocpte() destroys a 2/4MB "superpage" mapping it does not
reduce the pmap's resident count accordingly. It should.
MFC revision 1.532
Eliminate unnecessary TLB invalidations by pmap_enter(). Specifically,
eliminate TLB invalidations when permissions are relaxed, such as when a
read-only mapping is changed to a read/write mapping. Additionally,
eliminate TLB invalidations when bits that are ignored by the hardware,
such as PG_W ("wired mapping"), are changed.
Revision Changes Path
1.523.2.4 +44 -60 src/sys/i386/i386/pmap.c
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