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author | jchandra <jchandra@FreeBSD.org> | 2010-07-21 09:27:00 +0000 |
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committer | jchandra <jchandra@FreeBSD.org> | 2010-07-21 09:27:00 +0000 |
commit | 10dfd55de4c36ba1bf848c6973ffea562904c58a (patch) | |
tree | 3eec17c60bcda26e4e936937b8f883b4c7a68bb7 /contrib/pnpinfo | |
parent | fbd45b20c30db99fedc41b36dfb0d325d0c2cec3 (diff) | |
download | FreeBSD-src-10dfd55de4c36ba1bf848c6973ffea562904c58a.zip FreeBSD-src-10dfd55de4c36ba1bf848c6973ffea562904c58a.tar.gz |
Redo the page table page allocation on MIPS, as suggested by
alc@.
The UMA zone based allocation is replaced by a scheme that creates
a new free page list for the KSEG0 region, and a new function
in sys/vm that allocates pages from a specific free page list.
This also fixes a race condition introduced by the UMA based page table
page allocation code. Dropping the page queue and pmap locks before
the call to uma_zfree, and re-acquiring them afterwards will introduce
a race condtion(noted by alc@).
The changes are :
- Revert the earlier changes in MIPS pmap.c that added UMA zone for
page table pages.
- Add a new freelist VM_FREELIST_HIGHMEM to MIPS vmparam.h for memory that
is not directly mapped (in 32bit kernel). Normal page allocations will first
try the HIGHMEM freelist and then the default(direct mapped) freelist.
- Add a new function 'vm_page_t vm_page_alloc_freelist(int flind, int
order, int req)' to vm/vm_page.c to allocate a page from a specified
freelist. The MIPS page table pages will be allocated using this function
from the freelist containing direct mapped pages.
- Move the page initialization code from vm_phys_alloc_contig() to a
new function vm_page_alloc_init(), and use this function to initialize
pages in vm_page_alloc_freelist() too.
- Split the function vm_phys_alloc_pages(int pool, int order) to create
vm_phys_alloc_freelist_pages(int flind, int pool, int order), and use
this function from both vm_page_alloc_freelist() and vm_phys_alloc_pages().
Reviewed by: alc
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