Add cpuset, an api for thread to cpu binding and cpu resource grouping

and assignment.
 - Add a reference to a struct cpuset in each thread that is inherited from
   the thread that created it.
 - Release the reference when the thread is destroyed.
 - Add prototypes for syscalls and macros for manipulating cpusets in
   sys/cpuset.h
 - Add syscalls to create, get, and set new numbered cpusets:
   cpuset(), cpuset_{get,set}id()
 - Add syscalls for getting and setting affinity masks for cpusets or
   individual threads: cpuid_{get,set}affinity()
 - Add types for the 'level' and 'which' parameters for the cpuset.  This
   will permit expansion of the api to cover cpu masks for other objects
   identifiable with an id_t integer.  For example, IRQs and Jails may be
   coming soon.
 - The root set 0 contains all valid cpus.  All thread initially belong to
   cpuset 1.  This permits migrating all threads off of certain cpus to
   reserve them for special applications.

Sponsored by:	Nokia
Discussed with:	arch, rwatson, brooks, davidxu, deischen
Reviewed by:	antoine

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 299acbe..eba81cb 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -73,6 +73,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/unistd.h>
 #include <sys/malloc.h>
 #include <sys/conf.h>
+#include <sys/cpuset.h>
 
 #include <machine/cpu.h>
 
@@ -430,6 +431,7 @@ proc0_init(void *dummy __unused)
 	td->td_base_pri = PUSER;
 	td->td_oncpu = 0;
 	td->td_flags = TDF_INMEM|TDP_KTHREAD;
+	td->td_cpuset = cpuset_thread0();
 	p->p_peers = 0;
 	p->p_leader = p;