| kern_cpuset.c (194707) | kern_cpuset.c (198493) |
|---|---|
| 1/*- 2 * Copyright (c) 2008, Jeffrey Roberson <jeff@freebsd.org> 3 * All rights reserved. 4 * 5 * Copyright (c) 2008 Nokia Corporation 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without --- 15 unchanged lines hidden (view full) --- 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 */ 30 31#include <sys/cdefs.h> | 1/*- 2 * Copyright (c) 2008, Jeffrey Roberson <jeff@freebsd.org> 3 * All rights reserved. 4 * 5 * Copyright (c) 2008 Nokia Corporation 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without --- 15 unchanged lines hidden (view full) --- 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 */ 30 31#include <sys/cdefs.h> |
| 32__FBSDID("$FreeBSD: head/sys/kern/kern_cpuset.c 194707 2009-06-23 14:39:21Z jamie $"); | 32__FBSDID("$FreeBSD: head/sys/kern/kern_cpuset.c 198493 2009-10-26 17:42:03Z jhb $"); |
| 33 34#include "opt_ddb.h" 35 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/sysproto.h> 39#include <sys/jail.h> 40#include <sys/kernel.h> --- 33 unchanged lines hidden (view full) --- 74 * This set is usually a child of a 'root' set while the anonymous set may 75 * simply be referred to as a mask. In the syscall api these are referred to 76 * as the ROOT, CPUSET, and MASK levels where CPUSET is called 'base' here. 77 * 78 * Threads inherit their set from their creator whether it be anonymous or 79 * not. This means that anonymous sets are immutable because they may be 80 * shared. To modify an anonymous set a new set is created with the desired 81 * mask and the same parent as the existing anonymous set. This gives the | 33 34#include "opt_ddb.h" 35 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/sysproto.h> 39#include <sys/jail.h> 40#include <sys/kernel.h> --- 33 unchanged lines hidden (view full) --- 74 * This set is usually a child of a 'root' set while the anonymous set may 75 * simply be referred to as a mask. In the syscall api these are referred to 76 * as the ROOT, CPUSET, and MASK levels where CPUSET is called 'base' here. 77 * 78 * Threads inherit their set from their creator whether it be anonymous or 79 * not. This means that anonymous sets are immutable because they may be 80 * shared. To modify an anonymous set a new set is created with the desired 81 * mask and the same parent as the existing anonymous set. This gives the |
| 82 * illusion of each thread having a private mask.A | 82 * illusion of each thread having a private mask. |
| 83 * 84 * Via the syscall apis a user may ask to retrieve or modify the root, base, 85 * or mask that is discovered via a pid, tid, or setid. Modifying a set 86 * modifies all numbered and anonymous child sets to comply with the new mask. 87 * Modifying a pid or tid's mask applies only to that tid but must still 88 * exist within the assigned parent set. 89 * | 83 * 84 * Via the syscall apis a user may ask to retrieve or modify the root, base, 85 * or mask that is discovered via a pid, tid, or setid. Modifying a set 86 * modifies all numbered and anonymous child sets to comply with the new mask. 87 * Modifying a pid or tid's mask applies only to that tid but must still 88 * exist within the assigned parent set. 89 * |
| 90 * A thread may not be assigned to a a group seperate from other threads in | 90 * A thread may not be assigned to a a group separate from other threads in |
| 91 * the process. This is to remove ambiguity when the setid is queried with 92 * a pid argument. There is no other technical limitation. 93 * 94 * This somewhat complex arrangement is intended to make it easy for 95 * applications to query available processors and bind their threads to 96 * specific processors while also allowing administrators to dynamically 97 * reprovision by changing sets which apply to groups of processes. 98 * 99 * A simple application should not concern itself with sets at all and 100 * rather apply masks to its own threads via CPU_WHICH_TID and a -1 id | 91 * the process. This is to remove ambiguity when the setid is queried with 92 * a pid argument. There is no other technical limitation. 93 * 94 * This somewhat complex arrangement is intended to make it easy for 95 * applications to query available processors and bind their threads to 96 * specific processors while also allowing administrators to dynamically 97 * reprovision by changing sets which apply to groups of processes. 98 * 99 * A simple application should not concern itself with sets at all and 100 * rather apply masks to its own threads via CPU_WHICH_TID and a -1 id |
| 101 * meaning 'curthread'. It may query availble cpus for that tid with a | 101 * meaning 'curthread'. It may query available cpus for that tid with a |
| 102 * getaffinity call using (CPU_LEVEL_CPUSET, CPU_WHICH_PID, -1, ...). 103 */ 104static uma_zone_t cpuset_zone; 105static struct mtx cpuset_lock; 106static struct setlist cpuset_ids; 107static struct unrhdr *cpuset_unr; 108static struct cpuset *cpuset_zero; 109 --- 38 unchanged lines hidden (view full) --- 148 if (set->cs_id == CPUSET_INVALID) 149 set = set->cs_parent; 150 cpuset_ref(set); 151 152 return (set); 153} 154 155/* | 102 * getaffinity call using (CPU_LEVEL_CPUSET, CPU_WHICH_PID, -1, ...). 103 */ 104static uma_zone_t cpuset_zone; 105static struct mtx cpuset_lock; 106static struct setlist cpuset_ids; 107static struct unrhdr *cpuset_unr; 108static struct cpuset *cpuset_zero; 109 --- 38 unchanged lines hidden (view full) --- 148 if (set->cs_id == CPUSET_INVALID) 149 set = set->cs_parent; 150 cpuset_ref(set); 151 152 return (set); 153} 154 155/* |
| 156 * Release a reference in a context where it is safe to allocte. | 156 * Release a reference in a context where it is safe to allocate. |
| 157 */ 158void 159cpuset_rel(struct cpuset *set) 160{ 161 cpusetid_t id; 162 163 if (refcount_release(&set->cs_ref) == 0) 164 return; --- 582 unchanged lines hidden (view full) --- 747 if (error) 748 return (error); 749 cpuset_rel(set); 750 return (0); 751} 752 753/* 754 * This is called once the final set of system cpus is known. Modifies | 157 */ 158void 159cpuset_rel(struct cpuset *set) 160{ 161 cpusetid_t id; 162 163 if (refcount_release(&set->cs_ref) == 0) 164 return; --- 582 unchanged lines hidden (view full) --- 747 if (error) 748 return (error); 749 cpuset_rel(set); 750 return (0); 751} 752 753/* 754 * This is called once the final set of system cpus is known. Modifies |
| 755 * the root set and all children and mark the root readonly. | 755 * the root set and all children and mark the root read-only. |
| 756 */ 757static void 758cpuset_init(void *arg) 759{ 760 cpuset_t mask; 761 762 CPU_ZERO(&mask); 763#ifdef SMP --- 339 unchanged lines hidden --- | 756 */ 757static void 758cpuset_init(void *arg) 759{ 760 cpuset_t mask; 761 762 CPU_ZERO(&mask); 763#ifdef SMP --- 339 unchanged lines hidden --- |