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| author | jchandra <jchandra@FreeBSD.org> | 2010-08-06 07:32:33 +0000 |
|---|---|---|
| committer | jchandra <jchandra@FreeBSD.org> | 2010-08-06 07:32:33 +0000 |
| commit | c17c1b915d3111d18a76bf56ac4f95d6a2cf5c17 (patch) | |
| tree | e0f0fcc88e0e111a74d1986fc32557144318d35f /sys/mips/include/pmap.h | |
| parent | 6639a8f4cb6eacd78ac589888cd2475908d6d243 (diff) | |
| download | FreeBSD-src-c17c1b915d3111d18a76bf56ac4f95d6a2cf5c17.zip FreeBSD-src-c17c1b915d3111d18a76bf56ac4f95d6a2cf5c17.tar.gz | |
Fix the issue reported by alc:
pmap_page_wired_mappings() counts the number of pv entries for the
specified page that have the pv entry wired flag set to TRUE.
pmap_enter() correctly initializes this flag. However,
pmap_change_wiring() doesn't update the corresponding pv entry flag,
only the PTE. So, the count returned by pmap_page_wired_mappings()
will sometimes be wrong.
In the short term, the best fix would be to eliminate the pv entry
flag and use only the PTE. That flag is wasting non-trivial memory.
Remove pv_wired flag, and use PTE flag to count the wired mappings.
Reviewed by: alc
Diffstat (limited to 'sys/mips/include/pmap.h')
| -rw-r--r-- | sys/mips/include/pmap.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/sys/mips/include/pmap.h b/sys/mips/include/pmap.h index 3e7b937..0b4ef8a 100644 --- a/sys/mips/include/pmap.h +++ b/sys/mips/include/pmap.h @@ -124,7 +124,6 @@ typedef struct pv_entry { TAILQ_ENTRY(pv_entry) pv_list; TAILQ_ENTRY(pv_entry) pv_plist; vm_page_t pv_ptem; /* VM page for pte */ - boolean_t pv_wired; /* whether this entry is wired */ } *pv_entry_t; |
