path: root/sys/sys/pcpu.h
diff options
authorJohn Baldwin <jhb@FreeBSD.org>2010-07-27 20:33:50 +0000
committerJohn Baldwin <jhb@FreeBSD.org>2010-07-27 20:33:50 +0000
commita3870a1826f50ac9d8076f7f21738aa608a916fa (patch)
tree7e82572d7902fd76fd7aca9ed824e46e66521ec3 /sys/sys/pcpu.h
parent257ee8a4254a1ba9ad56cf1debf49d9404df2b16 (diff)
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
Notes: svn path=/head/; revision=210550
Diffstat (limited to 'sys/sys/pcpu.h')
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/sys/pcpu.h b/sys/sys/pcpu.h
index 917f32964a54..7d510c9ae7fe 100644
--- a/sys/sys/pcpu.h
+++ b/sys/sys/pcpu.h
@@ -179,6 +179,7 @@ struct pcpu {
struct device *pc_device;
void *pc_netisr; /* netisr SWI cookie */
int pc_dnweight; /* vm_page_dontneed() */
+ int pc_domain; /* Memory domain. */
* Stuff for read mostly lock