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author | jhb <jhb@FreeBSD.org> | 2010-07-27 20:33:50 +0000 |
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committer | jhb <jhb@FreeBSD.org> | 2010-07-27 20:33:50 +0000 |
commit | f27c8b35e2b318d78a7d1b1a5da79b6443afc069 (patch) | |
tree | 7e82572d7902fd76fd7aca9ed824e46e66521ec3 /sys/vm/vm_phys.h | |
parent | c5f2739ce161682d9aa352169fde83a2aa2073ae (diff) | |
download | FreeBSD-src-f27c8b35e2b318d78a7d1b1a5da79b6443afc069.zip FreeBSD-src-f27c8b35e2b318d78a7d1b1a5da79b6443afc069.tar.gz |
Very rough first cut at NUMA support for the physical page allocator. For
now it uses a very dumb first-touch allocation policy. This will change in
the future.
- Each architecture indicates the maximum number of supported memory domains
via a new VM_NDOMAIN parameter in <machine/vmparam.h>.
- Each cpu now has a PCPU_GET(domain) member to indicate the memory domain
a CPU belongs to. Domain values are dense and numbered from 0.
- When a platform supports multiple domains, the default freelist
(VM_FREELIST_DEFAULT) is split up into N freelists, one for each domain.
The MD code is required to populate an array of mem_affinity structures.
Each entry in the array defines a range of memory (start and end) and a
domain for the range. Multiple entries may be present for a single
domain. The list is terminated by an entry where all fields are zero.
This array of structures is used to split up phys_avail[] regions that
fall in VM_FREELIST_DEFAULT into per-domain freelists.
- Each memory domain has a separate lookup-array of freelists that is
used when fulfulling a physical memory allocation. Right now the
per-domain freelists are listed in a round-robin order for each domain.
In the future a table such as the ACPI SLIT table may be used to order
the per-domain lookup lists based on the penalty for each memory domain
relative to a specific domain. The lookup lists may be examined via a
new vm.phys.lookup_lists sysctl.
- The first-touch policy is implemented by using PCPU_GET(domain) to
pick a lookup list when allocating memory.
Reviewed by: alc
Diffstat (limited to 'sys/vm/vm_phys.h')
-rw-r--r-- | sys/vm/vm_phys.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/sys/vm/vm_phys.h b/sys/vm/vm_phys.h index 0dbd96a..a5b9e93 100644 --- a/sys/vm/vm_phys.h +++ b/sys/vm/vm_phys.h @@ -40,6 +40,15 @@ #ifdef _KERNEL +/* Domains must be dense (non-sparse) and zero-based. */ +struct mem_affinity { + vm_paddr_t start; + vm_paddr_t end; + int domain; +}; + +extern struct mem_affinity *mem_affinity; + void vm_phys_add_page(vm_paddr_t pa); vm_page_t vm_phys_alloc_contig(unsigned long npages, vm_paddr_t low, vm_paddr_t high, |