2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2008, Jeffrey Roberson <jeff@freebsd.org>
7 * Copyright (c) 2008 Nokia Corporation
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice unmodified, this list of conditions, and the following
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/sysctl.h>
41 #include <sys/ctype.h>
42 #include <sys/sysproto.h>
44 #include <sys/kernel.h>
46 #include <sys/malloc.h>
47 #include <sys/mutex.h>
50 #include <sys/refcount.h>
51 #include <sys/sched.h>
53 #include <sys/syscallsubr.h>
54 #include <sys/capsicum.h>
55 #include <sys/cpuset.h>
56 #include <sys/domainset.h>
58 #include <sys/queue.h>
59 #include <sys/libkern.h>
60 #include <sys/limits.h>
62 #include <sys/interrupt.h>
63 #include <sys/vmmeter.h>
67 #include <vm/vm_object.h>
68 #include <vm/vm_page.h>
69 #include <vm/vm_pageout.h>
70 #include <vm/vm_extern.h>
71 #include <vm/vm_param.h>
72 #include <vm/vm_phys.h>
73 #include <vm/vm_pagequeue.h>
80 * cpusets provide a mechanism for creating and manipulating sets of
81 * processors for the purpose of constraining the scheduling of threads to
82 * specific processors.
84 * Each process belongs to an identified set, by default this is set 1. Each
85 * thread may further restrict the cpus it may run on to a subset of this
86 * named set. This creates an anonymous set which other threads and processes
87 * may not join by number.
89 * The named set is referred to herein as the 'base' set to avoid ambiguity.
90 * This set is usually a child of a 'root' set while the anonymous set may
91 * simply be referred to as a mask. In the syscall api these are referred to
92 * as the ROOT, CPUSET, and MASK levels where CPUSET is called 'base' here.
94 * Threads inherit their set from their creator whether it be anonymous or
95 * not. This means that anonymous sets are immutable because they may be
96 * shared. To modify an anonymous set a new set is created with the desired
97 * mask and the same parent as the existing anonymous set. This gives the
98 * illusion of each thread having a private mask.
100 * Via the syscall apis a user may ask to retrieve or modify the root, base,
101 * or mask that is discovered via a pid, tid, or setid. Modifying a set
102 * modifies all numbered and anonymous child sets to comply with the new mask.
103 * Modifying a pid or tid's mask applies only to that tid but must still
104 * exist within the assigned parent set.
106 * A thread may not be assigned to a group separate from other threads in
107 * the process. This is to remove ambiguity when the setid is queried with
108 * a pid argument. There is no other technical limitation.
110 * This somewhat complex arrangement is intended to make it easy for
111 * applications to query available processors and bind their threads to
112 * specific processors while also allowing administrators to dynamically
113 * reprovision by changing sets which apply to groups of processes.
115 * A simple application should not concern itself with sets at all and
116 * rather apply masks to its own threads via CPU_WHICH_TID and a -1 id
117 * meaning 'curthread'. It may query available cpus for that tid with a
118 * getaffinity call using (CPU_LEVEL_CPUSET, CPU_WHICH_PID, -1, ...).
121 LIST_HEAD(domainlist, domainset);
122 struct domainset __read_mostly domainset_prefer[MAXMEMDOM];
123 struct domainset __read_mostly domainset_roundrobin;
125 static uma_zone_t cpuset_zone;
126 static uma_zone_t domainset_zone;
127 static struct mtx cpuset_lock;
128 static struct setlist cpuset_ids;
129 static struct domainlist cpuset_domains;
130 static struct unrhdr *cpuset_unr;
131 static struct cpuset *cpuset_zero, *cpuset_default, *cpuset_kernel;
132 static struct domainset domainset0, domainset2;
134 /* Return the size of cpuset_t at the kernel level */
135 SYSCTL_INT(_kern_sched, OID_AUTO, cpusetsize, CTLFLAG_RD | CTLFLAG_CAPRD,
136 SYSCTL_NULL_INT_PTR, sizeof(cpuset_t), "sizeof(cpuset_t)");
138 cpuset_t *cpuset_root;
139 cpuset_t cpuset_domain[MAXMEMDOM];
141 static int domainset_valid(const struct domainset *, const struct domainset *);
144 * Find the first non-anonymous set starting from 'set'.
146 static struct cpuset *
147 cpuset_getbase(struct cpuset *set)
150 if (set->cs_id == CPUSET_INVALID)
151 set = set->cs_parent;
156 * Walks up the tree from 'set' to find the root.
158 static struct cpuset *
159 cpuset_getroot(struct cpuset *set)
162 while ((set->cs_flags & CPU_SET_ROOT) == 0 && set->cs_parent != NULL)
163 set = set->cs_parent;
168 * Acquire a reference to a cpuset, all pointers must be tracked with refs.
171 cpuset_ref(struct cpuset *set)
174 refcount_acquire(&set->cs_ref);
179 * Walks up the tree from 'set' to find the root. Returns the root
182 static struct cpuset *
183 cpuset_refroot(struct cpuset *set)
186 return (cpuset_ref(cpuset_getroot(set)));
190 * Find the first non-anonymous set starting from 'set'. Returns this set
191 * referenced. May return the passed in set with an extra ref if it is
194 static struct cpuset *
195 cpuset_refbase(struct cpuset *set)
198 return (cpuset_ref(cpuset_getbase(set)));
202 * Release a reference in a context where it is safe to allocate.
205 cpuset_rel(struct cpuset *set)
209 if (refcount_release(&set->cs_ref) == 0)
211 mtx_lock_spin(&cpuset_lock);
212 LIST_REMOVE(set, cs_siblings);
214 if (id != CPUSET_INVALID)
215 LIST_REMOVE(set, cs_link);
216 mtx_unlock_spin(&cpuset_lock);
217 cpuset_rel(set->cs_parent);
218 uma_zfree(cpuset_zone, set);
219 if (id != CPUSET_INVALID)
220 free_unr(cpuset_unr, id);
224 * Deferred release must be used when in a context that is not safe to
225 * allocate/free. This places any unreferenced sets on the list 'head'.
228 cpuset_rel_defer(struct setlist *head, struct cpuset *set)
231 if (refcount_release(&set->cs_ref) == 0)
233 mtx_lock_spin(&cpuset_lock);
234 LIST_REMOVE(set, cs_siblings);
235 if (set->cs_id != CPUSET_INVALID)
236 LIST_REMOVE(set, cs_link);
237 LIST_INSERT_HEAD(head, set, cs_link);
238 mtx_unlock_spin(&cpuset_lock);
242 * Complete a deferred release. Removes the set from the list provided to
246 cpuset_rel_complete(struct cpuset *set)
248 LIST_REMOVE(set, cs_link);
249 cpuset_rel(set->cs_parent);
250 uma_zfree(cpuset_zone, set);
254 * Find a set based on an id. Returns it with a ref.
256 static struct cpuset *
257 cpuset_lookup(cpusetid_t setid, struct thread *td)
261 if (setid == CPUSET_INVALID)
263 mtx_lock_spin(&cpuset_lock);
264 LIST_FOREACH(set, &cpuset_ids, cs_link)
265 if (set->cs_id == setid)
269 mtx_unlock_spin(&cpuset_lock);
271 KASSERT(td != NULL, ("[%s:%d] td is NULL", __func__, __LINE__));
272 if (set != NULL && jailed(td->td_ucred)) {
273 struct cpuset *jset, *tset;
275 jset = td->td_ucred->cr_prison->pr_cpuset;
276 for (tset = set; tset != NULL; tset = tset->cs_parent)
289 * Create a set in the space provided in 'set' with the provided parameters.
290 * The set is returned with a single ref. May return EDEADLK if the set
291 * will have no valid cpu based on restrictions from the parent.
294 _cpuset_create(struct cpuset *set, struct cpuset *parent,
295 const cpuset_t *mask, struct domainset *domain, cpusetid_t id)
299 domain = parent->cs_domain;
301 mask = &parent->cs_mask;
302 if (!CPU_OVERLAP(&parent->cs_mask, mask))
304 /* The domain must be prepared ahead of time. */
305 if (!domainset_valid(parent->cs_domain, domain))
307 CPU_COPY(mask, &set->cs_mask);
308 LIST_INIT(&set->cs_children);
309 refcount_init(&set->cs_ref, 1);
311 mtx_lock_spin(&cpuset_lock);
312 set->cs_domain = domain;
313 CPU_AND(&set->cs_mask, &parent->cs_mask);
315 set->cs_parent = cpuset_ref(parent);
316 LIST_INSERT_HEAD(&parent->cs_children, set, cs_siblings);
317 if (set->cs_id != CPUSET_INVALID)
318 LIST_INSERT_HEAD(&cpuset_ids, set, cs_link);
319 mtx_unlock_spin(&cpuset_lock);
325 * Create a new non-anonymous set with the requested parent and mask. May
326 * return failures if the mask is invalid or a new number can not be
330 cpuset_create(struct cpuset **setp, struct cpuset *parent, const cpuset_t *mask)
336 id = alloc_unr(cpuset_unr);
339 *setp = set = uma_zalloc(cpuset_zone, M_WAITOK | M_ZERO);
340 error = _cpuset_create(set, parent, mask, NULL, id);
343 free_unr(cpuset_unr, id);
344 uma_zfree(cpuset_zone, set);
350 cpuset_freelist_add(struct setlist *list, int count)
355 for (i = 0; i < count; i++) {
356 set = uma_zalloc(cpuset_zone, M_ZERO | M_WAITOK);
357 LIST_INSERT_HEAD(list, set, cs_link);
362 cpuset_freelist_init(struct setlist *list, int count)
366 cpuset_freelist_add(list, count);
370 cpuset_freelist_free(struct setlist *list)
374 while ((set = LIST_FIRST(list)) != NULL) {
375 LIST_REMOVE(set, cs_link);
376 uma_zfree(cpuset_zone, set);
381 domainset_freelist_add(struct domainlist *list, int count)
383 struct domainset *set;
386 for (i = 0; i < count; i++) {
387 set = uma_zalloc(domainset_zone, M_ZERO | M_WAITOK);
388 LIST_INSERT_HEAD(list, set, ds_link);
393 domainset_freelist_init(struct domainlist *list, int count)
397 domainset_freelist_add(list, count);
401 domainset_freelist_free(struct domainlist *list)
403 struct domainset *set;
405 while ((set = LIST_FIRST(list)) != NULL) {
406 LIST_REMOVE(set, ds_link);
407 uma_zfree(domainset_zone, set);
411 /* Copy a domainset preserving mask and policy. */
413 domainset_copy(const struct domainset *from, struct domainset *to)
416 DOMAINSET_COPY(&from->ds_mask, &to->ds_mask);
417 to->ds_policy = from->ds_policy;
418 to->ds_prefer = from->ds_prefer;
421 /* Return 1 if mask and policy are equal, otherwise 0. */
423 domainset_equal(const struct domainset *one, const struct domainset *two)
426 return (DOMAINSET_CMP(&one->ds_mask, &two->ds_mask) == 0 &&
427 one->ds_policy == two->ds_policy &&
428 one->ds_prefer == two->ds_prefer);
431 /* Return 1 if child is a valid subset of parent. */
433 domainset_valid(const struct domainset *parent, const struct domainset *child)
435 if (child->ds_policy != DOMAINSET_POLICY_PREFER)
436 return (DOMAINSET_SUBSET(&parent->ds_mask, &child->ds_mask));
437 return (DOMAINSET_ISSET(child->ds_prefer, &parent->ds_mask));
441 domainset_restrict(const struct domainset *parent,
442 const struct domainset *child)
444 if (child->ds_policy != DOMAINSET_POLICY_PREFER)
445 return (DOMAINSET_OVERLAP(&parent->ds_mask, &child->ds_mask));
446 return (DOMAINSET_ISSET(child->ds_prefer, &parent->ds_mask));
450 * Lookup or create a domainset. The key is provided in ds_mask and
451 * ds_policy. If the domainset does not yet exist the storage in
452 * 'domain' is used to insert. Otherwise this storage is freed to the
453 * domainset_zone and the existing domainset is returned.
455 static struct domainset *
456 _domainset_create(struct domainset *domain, struct domainlist *freelist)
458 struct domainset *ndomain;
461 KASSERT(domain->ds_cnt <= vm_ndomains,
462 ("invalid domain count in domainset %p", domain));
463 KASSERT(domain->ds_policy != DOMAINSET_POLICY_PREFER ||
464 domain->ds_prefer < vm_ndomains,
465 ("invalid preferred domain in domains %p", domain));
467 mtx_lock_spin(&cpuset_lock);
468 LIST_FOREACH(ndomain, &cpuset_domains, ds_link)
469 if (domainset_equal(ndomain, domain))
472 * If the domain does not yet exist we insert it and initialize
473 * various iteration helpers which are not part of the key.
475 if (ndomain == NULL) {
476 LIST_INSERT_HEAD(&cpuset_domains, domain, ds_link);
477 domain->ds_cnt = DOMAINSET_COUNT(&domain->ds_mask);
478 max = DOMAINSET_FLS(&domain->ds_mask) + 1;
479 for (i = 0, j = 0; i < max; i++)
480 if (DOMAINSET_ISSET(i, &domain->ds_mask))
481 domain->ds_order[j++] = i;
483 mtx_unlock_spin(&cpuset_lock);
486 if (freelist != NULL)
487 LIST_INSERT_HEAD(freelist, domain, ds_link);
489 uma_zfree(domainset_zone, domain);
495 * Are any of the domains in the mask empty? If so, silently
496 * remove them. If only empty domains are present, we must
500 domainset_empty_vm(struct domainset *domain)
504 max = DOMAINSET_FLS(&domain->ds_mask) + 1;
505 for (i = 0; i < max; i++) {
506 if (DOMAINSET_ISSET(i, &domain->ds_mask) &&
508 DOMAINSET_CLR(i, &domain->ds_mask);
511 return (DOMAINSET_EMPTY(&domain->ds_mask));
515 * Create or lookup a domainset based on the key held in 'domain'.
518 domainset_create(const struct domainset *domain)
520 struct domainset *ndomain;
523 * Validate the policy. It must specify a useable policy number with
524 * only valid domains. Preferred must include the preferred domain
527 if (domain->ds_policy <= DOMAINSET_POLICY_INVALID ||
528 domain->ds_policy > DOMAINSET_POLICY_MAX)
530 if (domain->ds_policy == DOMAINSET_POLICY_PREFER &&
531 !DOMAINSET_ISSET(domain->ds_prefer, &domain->ds_mask))
533 if (!DOMAINSET_SUBSET(&domainset0.ds_mask, &domain->ds_mask))
535 ndomain = uma_zalloc(domainset_zone, M_WAITOK | M_ZERO);
536 domainset_copy(domain, ndomain);
537 return _domainset_create(ndomain, NULL);
541 * Update thread domainset pointers.
544 domainset_notify(void)
549 sx_slock(&allproc_lock);
550 FOREACH_PROC_IN_SYSTEM(p) {
552 if (p->p_state == PRS_NEW) {
556 FOREACH_THREAD_IN_PROC(p, td) {
558 td->td_domain.dr_policy = td->td_cpuset->cs_domain;
563 sx_sunlock(&allproc_lock);
564 kernel_object->domain.dr_policy = cpuset_kernel->cs_domain;
568 * Create a new set that is a subset of a parent.
570 static struct domainset *
571 domainset_shadow(const struct domainset *pdomain,
572 const struct domainset *domain, struct domainlist *freelist)
574 struct domainset *ndomain;
576 ndomain = LIST_FIRST(freelist);
577 LIST_REMOVE(ndomain, ds_link);
580 * Initialize the key from the request.
582 domainset_copy(domain, ndomain);
585 * Restrict the key by the parent.
587 DOMAINSET_AND(&ndomain->ds_mask, &pdomain->ds_mask);
589 return _domainset_create(ndomain, freelist);
593 * Recursively check for errors that would occur from applying mask to
594 * the tree of sets starting at 'set'. Checks for sets that would become
595 * empty as well as RDONLY flags.
598 cpuset_testupdate(struct cpuset *set, cpuset_t *mask, int check_mask)
604 mtx_assert(&cpuset_lock, MA_OWNED);
605 if (set->cs_flags & CPU_SET_RDONLY)
608 if (!CPU_OVERLAP(&set->cs_mask, mask))
610 CPU_COPY(&set->cs_mask, &newmask);
611 CPU_AND(&newmask, mask);
613 CPU_COPY(mask, &newmask);
615 LIST_FOREACH(nset, &set->cs_children, cs_siblings)
616 if ((error = cpuset_testupdate(nset, &newmask, 1)) != 0)
622 * Applies the mask 'mask' without checking for empty sets or permissions.
625 cpuset_update(struct cpuset *set, cpuset_t *mask)
629 mtx_assert(&cpuset_lock, MA_OWNED);
630 CPU_AND(&set->cs_mask, mask);
631 LIST_FOREACH(nset, &set->cs_children, cs_siblings)
632 cpuset_update(nset, &set->cs_mask);
638 * Modify the set 'set' to use a copy of the mask provided. Apply this new
639 * mask to restrict all children in the tree. Checks for validity before
640 * applying the changes.
643 cpuset_modify(struct cpuset *set, cpuset_t *mask)
648 error = priv_check(curthread, PRIV_SCHED_CPUSET);
652 * In case we are called from within the jail
653 * we do not allow modifying the dedicated root
654 * cpuset of the jail but may still allow to
657 if (jailed(curthread->td_ucred) &&
658 set->cs_flags & CPU_SET_ROOT)
661 * Verify that we have access to this set of
664 root = cpuset_getroot(set);
665 mtx_lock_spin(&cpuset_lock);
666 if (root && !CPU_SUBSET(&root->cs_mask, mask)) {
670 error = cpuset_testupdate(set, mask, 0);
673 CPU_COPY(mask, &set->cs_mask);
674 cpuset_update(set, mask);
676 mtx_unlock_spin(&cpuset_lock);
682 * Recursively check for errors that would occur from applying mask to
683 * the tree of sets starting at 'set'. Checks for sets that would become
684 * empty as well as RDONLY flags.
687 cpuset_testupdate_domain(struct cpuset *set, struct domainset *dset,
688 struct domainset *orig, int *count, int check_mask)
691 struct domainset *domain;
692 struct domainset newset;
695 mtx_assert(&cpuset_lock, MA_OWNED);
696 if (set->cs_flags & CPU_SET_RDONLY)
698 domain = set->cs_domain;
699 domainset_copy(domain, &newset);
700 if (!domainset_equal(domain, orig)) {
701 if (!domainset_restrict(domain, dset))
703 DOMAINSET_AND(&newset.ds_mask, &dset->ds_mask);
704 /* Count the number of domains that are changing. */
708 LIST_FOREACH(nset, &set->cs_children, cs_siblings)
709 if ((error = cpuset_testupdate_domain(nset, &newset, domain,
716 * Applies the mask 'mask' without checking for empty sets or permissions.
719 cpuset_update_domain(struct cpuset *set, struct domainset *domain,
720 struct domainset *orig, struct domainlist *domains)
724 mtx_assert(&cpuset_lock, MA_OWNED);
726 * If this domainset has changed from the parent we must calculate
727 * a new set. Otherwise it simply inherits from the parent. When
728 * we inherit from the parent we get a new mask and policy. If the
729 * set is modified from the parent we keep the policy and only
732 if (set->cs_domain != orig) {
733 orig = set->cs_domain;
734 set->cs_domain = domainset_shadow(domain, orig, domains);
736 set->cs_domain = domain;
737 LIST_FOREACH(nset, &set->cs_children, cs_siblings)
738 cpuset_update_domain(nset, set->cs_domain, orig, domains);
744 * Modify the set 'set' to use a copy the domainset provided. Apply this new
745 * mask to restrict all children in the tree. Checks for validity before
746 * applying the changes.
749 cpuset_modify_domain(struct cpuset *set, struct domainset *domain)
751 struct domainlist domains;
752 struct domainset temp;
753 struct domainset *dset;
755 int ndomains, needed;
758 error = priv_check(curthread, PRIV_SCHED_CPUSET);
762 * In case we are called from within the jail
763 * we do not allow modifying the dedicated root
764 * cpuset of the jail but may still allow to
767 if (jailed(curthread->td_ucred) &&
768 set->cs_flags & CPU_SET_ROOT)
770 domainset_freelist_init(&domains, 0);
771 domain = domainset_create(domain);
772 ndomains = needed = 0;
774 if (ndomains < needed) {
775 domainset_freelist_add(&domains, needed - ndomains);
778 root = cpuset_getroot(set);
779 mtx_lock_spin(&cpuset_lock);
780 dset = root->cs_domain;
782 * Verify that we have access to this set of domains.
784 if (root && !domainset_valid(dset, domain)) {
789 * If applying prefer we keep the current set as the fallback.
791 if (domain->ds_policy == DOMAINSET_POLICY_PREFER)
792 DOMAINSET_COPY(&set->cs_domain->ds_mask,
795 * Determine whether we can apply this set of domains and
796 * how many new domain structures it will require.
798 domainset_copy(domain, &temp);
800 error = cpuset_testupdate_domain(set, &temp, set->cs_domain,
804 } while (ndomains < needed);
805 dset = set->cs_domain;
806 cpuset_update_domain(set, domain, dset, &domains);
808 mtx_unlock_spin(&cpuset_lock);
809 domainset_freelist_free(&domains);
817 * Resolve the 'which' parameter of several cpuset apis.
819 * For WHICH_PID and WHICH_TID return a locked proc and valid proc/tid. Also
820 * checks for permission via p_cansched().
822 * For WHICH_SET returns a valid set with a new reference.
824 * -1 may be supplied for any argument to mean the current proc/thread or
825 * the base set of the current thread. May fail with ESRCH/EPERM.
828 cpuset_which(cpuwhich_t which, id_t id, struct proc **pp, struct thread **tdp,
829 struct cpuset **setp)
846 if ((p = pfind(id)) == NULL)
861 case CPU_WHICH_CPUSET:
863 thread_lock(curthread);
864 set = cpuset_refbase(curthread->td_cpuset);
865 thread_unlock(curthread);
867 set = cpuset_lookup(id, curthread);
875 /* Find `set' for prison with given id. */
878 sx_slock(&allprison_lock);
879 pr = prison_find_child(curthread->td_ucred->cr_prison, id);
880 sx_sunlock(&allprison_lock);
883 cpuset_ref(pr->pr_cpuset);
884 *setp = pr->pr_cpuset;
885 mtx_unlock(&pr->pr_mtx);
889 case CPU_WHICH_DOMAIN:
894 error = p_cansched(curthread, p);
900 td = FIRST_THREAD_IN_PROC(p);
907 cpuset_testshadow(struct cpuset *set, const cpuset_t *mask,
908 const struct domainset *domain)
910 struct cpuset *parent;
911 struct domainset *dset;
913 parent = cpuset_getbase(set);
915 * If we are restricting a cpu mask it must be a subset of the
916 * parent or invalid CPUs have been specified.
918 if (mask != NULL && !CPU_SUBSET(&parent->cs_mask, mask))
922 * If we are restricting a domain mask it must be a subset of the
923 * parent or invalid domains have been specified.
925 dset = parent->cs_domain;
926 if (domain != NULL && !domainset_valid(dset, domain))
933 * Create an anonymous set with the provided mask in the space provided by
934 * 'nset'. If the passed in set is anonymous we use its parent otherwise
935 * the new set is a child of 'set'.
938 cpuset_shadow(struct cpuset *set, struct cpuset **nsetp,
939 const cpuset_t *mask, const struct domainset *domain,
940 struct setlist *cpusets, struct domainlist *domains)
942 struct cpuset *parent;
944 struct domainset *dset;
948 error = cpuset_testshadow(set, mask, domain);
952 parent = cpuset_getbase(set);
953 dset = parent->cs_domain;
955 mask = &set->cs_mask;
957 d = domainset_shadow(dset, domain, domains);
960 nset = LIST_FIRST(cpusets);
961 error = _cpuset_create(nset, parent, mask, d, CPUSET_INVALID);
963 LIST_REMOVE(nset, cs_link);
969 static struct cpuset *
970 cpuset_update_thread(struct thread *td, struct cpuset *nset)
972 struct cpuset *tdset;
974 tdset = td->td_cpuset;
975 td->td_cpuset = nset;
976 td->td_domain.dr_policy = nset->cs_domain;
983 cpuset_setproc_test_maskthread(struct cpuset *tdset, cpuset_t *mask,
984 struct domainset *domain)
986 struct cpuset *parent;
988 parent = cpuset_getbase(tdset);
990 mask = &tdset->cs_mask;
992 domain = tdset->cs_domain;
993 return cpuset_testshadow(parent, mask, domain);
997 cpuset_setproc_maskthread(struct cpuset *tdset, cpuset_t *mask,
998 struct domainset *domain, struct cpuset **nsetp,
999 struct setlist *freelist, struct domainlist *domainlist)
1001 struct cpuset *parent;
1003 parent = cpuset_getbase(tdset);
1005 mask = &tdset->cs_mask;
1007 domain = tdset->cs_domain;
1008 return cpuset_shadow(parent, nsetp, mask, domain, freelist,
1013 cpuset_setproc_setthread_mask(struct cpuset *tdset, struct cpuset *set,
1014 cpuset_t *mask, struct domainset *domain)
1016 struct cpuset *parent;
1018 parent = cpuset_getbase(tdset);
1021 * If the thread restricted its mask then apply that same
1022 * restriction to the new set, otherwise take it wholesale.
1024 if (CPU_CMP(&tdset->cs_mask, &parent->cs_mask) != 0) {
1025 CPU_COPY(&tdset->cs_mask, mask);
1026 CPU_AND(mask, &set->cs_mask);
1028 CPU_COPY(&set->cs_mask, mask);
1031 * If the thread restricted the domain then we apply the
1032 * restriction to the new set but retain the policy.
1034 if (tdset->cs_domain != parent->cs_domain) {
1035 domainset_copy(tdset->cs_domain, domain);
1036 DOMAINSET_AND(&domain->ds_mask, &set->cs_domain->ds_mask);
1038 domainset_copy(set->cs_domain, domain);
1040 if (CPU_EMPTY(mask) || DOMAINSET_EMPTY(&domain->ds_mask))
1047 cpuset_setproc_test_setthread(struct cpuset *tdset, struct cpuset *set)
1049 struct domainset domain;
1052 if (tdset->cs_id != CPUSET_INVALID)
1054 return cpuset_setproc_setthread_mask(tdset, set, &mask, &domain);
1058 cpuset_setproc_setthread(struct cpuset *tdset, struct cpuset *set,
1059 struct cpuset **nsetp, struct setlist *freelist,
1060 struct domainlist *domainlist)
1062 struct domainset domain;
1067 * If we're replacing on a thread that has not constrained the
1068 * original set we can simply accept the new set.
1070 if (tdset->cs_id != CPUSET_INVALID) {
1071 *nsetp = cpuset_ref(set);
1074 error = cpuset_setproc_setthread_mask(tdset, set, &mask, &domain);
1078 return cpuset_shadow(tdset, nsetp, &mask, &domain, freelist,
1083 * Handle three cases for updating an entire process.
1085 * 1) Set is non-null. This reparents all anonymous sets to the provided
1086 * set and replaces all non-anonymous td_cpusets with the provided set.
1087 * 2) Mask is non-null. This replaces or creates anonymous sets for every
1088 * thread with the existing base as a parent.
1089 * 3) domain is non-null. This creates anonymous sets for every thread
1090 * and replaces the domain set.
1092 * This is overly complicated because we can't allocate while holding a
1093 * spinlock and spinlocks must be held while changing and examining thread
1097 cpuset_setproc(pid_t pid, struct cpuset *set, cpuset_t *mask,
1098 struct domainset *domain)
1100 struct setlist freelist;
1101 struct setlist droplist;
1102 struct domainlist domainlist;
1103 struct cpuset *nset;
1111 * The algorithm requires two passes due to locking considerations.
1113 * 1) Lookup the process and acquire the locks in the required order.
1114 * 2) If enough cpusets have not been allocated release the locks and
1115 * allocate them. Loop.
1117 cpuset_freelist_init(&freelist, 1);
1118 domainset_freelist_init(&domainlist, 1);
1120 LIST_INIT(&droplist);
1123 error = cpuset_which(CPU_WHICH_PID, pid, &p, &td, &nset);
1126 if (nfree >= p->p_numthreads)
1128 threads = p->p_numthreads;
1130 if (nfree < threads) {
1131 cpuset_freelist_add(&freelist, threads - nfree);
1132 domainset_freelist_add(&domainlist, threads - nfree);
1136 PROC_LOCK_ASSERT(p, MA_OWNED);
1138 * Now that the appropriate locks are held and we have enough cpusets,
1139 * make sure the operation will succeed before applying changes. The
1140 * proc lock prevents td_cpuset from changing between calls.
1143 FOREACH_THREAD_IN_PROC(p, td) {
1146 error = cpuset_setproc_test_setthread(td->td_cpuset,
1149 error = cpuset_setproc_test_maskthread(td->td_cpuset,
1156 * Replace each thread's cpuset while using deferred release. We
1157 * must do this because the thread lock must be held while operating
1158 * on the thread and this limits the type of operations allowed.
1160 FOREACH_THREAD_IN_PROC(p, td) {
1163 error = cpuset_setproc_setthread(td->td_cpuset, set,
1164 &nset, &freelist, &domainlist);
1166 error = cpuset_setproc_maskthread(td->td_cpuset, mask,
1167 domain, &nset, &freelist, &domainlist);
1172 cpuset_rel_defer(&droplist, cpuset_update_thread(td, nset));
1178 while ((nset = LIST_FIRST(&droplist)) != NULL)
1179 cpuset_rel_complete(nset);
1180 cpuset_freelist_free(&freelist);
1181 domainset_freelist_free(&domainlist);
1186 bitset_strprint(char *buf, size_t bufsiz, const struct bitset *set, int setlen)
1194 for (i = 0; i < __bitset_words(setlen); i++) {
1203 if (bufsiz < sizeof(__STRING(ULONG_MAX)))
1205 bytes = snprintf(p, bufsiz, "%lx", set->__bits[i]);
1213 bitset_strscan(struct bitset *set, int setlen, const char *buf)
1218 BIT_ZERO(setlen, set);
1220 for (i = 0; i < __bitset_words(setlen); i++) {
1225 ret = sscanf(p, "%lx", &set->__bits[i]);
1226 if (ret == 0 || ret == -1)
1228 while (isxdigit(*p))
1235 * Return a string representing a valid layout for a cpuset_t object.
1236 * It expects an incoming buffer at least sized as CPUSETBUFSIZ.
1239 cpusetobj_strprint(char *buf, const cpuset_t *set)
1242 bitset_strprint(buf, CPUSETBUFSIZ, (const struct bitset *)set,
1248 * Build a valid cpuset_t object from a string representation.
1249 * It expects an incoming buffer at least sized as CPUSETBUFSIZ.
1252 cpusetobj_strscan(cpuset_t *set, const char *buf)
1256 if (strlen(buf) > CPUSETBUFSIZ - 1)
1259 p = buf[bitset_strscan((struct bitset *)set, CPU_SETSIZE, buf)];
1267 * Handle a domainset specifier in the sysctl tree. A poiner to a pointer to
1268 * a domainset is in arg1. If the user specifies a valid domainset the
1269 * pointer is updated.
1272 * hex mask word 0,hex mask word 1,...:decimal policy:decimal preferred
1275 sysctl_handle_domainset(SYSCTL_HANDLER_ARGS)
1277 char buf[DOMAINSETBUFSIZ];
1278 struct domainset *dset;
1279 struct domainset key;
1280 int policy, prefer, error;
1283 dset = *(struct domainset **)arg1;
1287 p = buf + bitset_strprint(buf, DOMAINSETBUFSIZ,
1288 (const struct bitset *)&dset->ds_mask, DOMAINSET_SETSIZE);
1289 sprintf(p, ":%d:%d", dset->ds_policy, dset->ds_prefer);
1291 sprintf(buf, "<NULL>");
1292 error = sysctl_handle_string(oidp, buf, sizeof(buf), req);
1293 if (error != 0 || req->newptr == NULL)
1297 * Read in and validate the string.
1299 memset(&key, 0, sizeof(key));
1300 p = &buf[bitset_strscan((struct bitset *)&key.ds_mask,
1301 DOMAINSET_SETSIZE, buf)];
1304 if (sscanf(p, ":%d:%d", &policy, &prefer) != 2)
1306 key.ds_policy = policy;
1307 key.ds_prefer = prefer;
1309 /* Domainset_create() validates the policy.*/
1310 dset = domainset_create(&key);
1313 *(struct domainset **)arg1 = dset;
1319 * Apply an anonymous mask or a domain to a single thread.
1322 _cpuset_setthread(lwpid_t id, cpuset_t *mask, struct domainset *domain)
1324 struct setlist cpusets;
1325 struct domainlist domainlist;
1326 struct cpuset *nset;
1332 cpuset_freelist_init(&cpusets, 1);
1333 domainset_freelist_init(&domainlist, domain != NULL);
1334 error = cpuset_which(CPU_WHICH_TID, id, &p, &td, &set);
1339 error = cpuset_shadow(td->td_cpuset, &nset, mask, domain,
1340 &cpusets, &domainlist);
1342 set = cpuset_update_thread(td, nset);
1348 cpuset_freelist_free(&cpusets);
1349 domainset_freelist_free(&domainlist);
1354 * Apply an anonymous mask to a single thread.
1357 cpuset_setthread(lwpid_t id, cpuset_t *mask)
1360 return _cpuset_setthread(id, mask, NULL);
1364 * Apply new cpumask to the ithread.
1367 cpuset_setithread(lwpid_t id, int cpu)
1373 CPU_COPY(cpuset_root, &mask);
1375 CPU_SET(cpu, &mask);
1376 return _cpuset_setthread(id, &mask, NULL);
1380 * Initialize static domainsets after NUMA information is available. This is
1381 * called very early during boot.
1384 domainset_init(void)
1386 struct domainset *dset;
1389 dset = &domainset_roundrobin;
1390 DOMAINSET_COPY(&all_domains, &dset->ds_mask);
1391 dset->ds_policy = DOMAINSET_POLICY_ROUNDROBIN;
1392 dset->ds_prefer = -1;
1393 _domainset_create(dset, NULL);
1395 for (i = 0; i < vm_ndomains; i++) {
1396 dset = &domainset_prefer[i];
1397 DOMAINSET_COPY(&all_domains, &dset->ds_mask);
1398 dset->ds_policy = DOMAINSET_POLICY_PREFER;
1399 dset->ds_prefer = i;
1400 _domainset_create(dset, NULL);
1405 * Create the domainset for cpuset 0, 1 and cpuset 2.
1408 domainset_zero(void)
1410 struct domainset *dset;
1412 mtx_init(&cpuset_lock, "cpuset", NULL, MTX_SPIN | MTX_RECURSE);
1415 DOMAINSET_COPY(&all_domains, &dset->ds_mask);
1416 dset->ds_policy = DOMAINSET_POLICY_FIRSTTOUCH;
1417 dset->ds_prefer = -1;
1418 curthread->td_domain.dr_policy = _domainset_create(dset, NULL);
1420 domainset_copy(dset, &domainset2);
1421 domainset2.ds_policy = DOMAINSET_POLICY_INTERLEAVE;
1422 kernel_object->domain.dr_policy = _domainset_create(&domainset2, NULL);
1424 /* Remove empty domains from the global policies. */
1425 LIST_FOREACH(dset, &cpuset_domains, ds_link)
1426 (void)domainset_empty_vm(dset);
1430 * Creates system-wide cpusets and the cpuset for thread0 including three
1433 * 0 - The root set which should represent all valid processors in the
1434 * system. It is initially created with a mask of all processors
1435 * because we don't know what processors are valid until cpuset_init()
1436 * runs. This set is immutable.
1437 * 1 - The default set which all processes are a member of until changed.
1438 * This allows an administrator to move all threads off of given cpus to
1439 * dedicate them to high priority tasks or save power etc.
1440 * 2 - The kernel set which allows restriction and policy to be applied only
1441 * to kernel threads and the kernel_object.
1444 cpuset_thread0(void)
1450 cpuset_zone = uma_zcreate("cpuset", sizeof(struct cpuset), NULL, NULL,
1451 NULL, NULL, UMA_ALIGN_CACHE, 0);
1452 domainset_zone = uma_zcreate("domainset", sizeof(struct domainset),
1453 NULL, NULL, NULL, NULL, UMA_ALIGN_CACHE, 0);
1456 * Create the root system set (0) for the whole machine. Doesn't use
1457 * cpuset_create() due to NULL parent.
1459 set = uma_zalloc(cpuset_zone, M_WAITOK | M_ZERO);
1460 CPU_COPY(&all_cpus, &set->cs_mask);
1461 LIST_INIT(&set->cs_children);
1462 LIST_INSERT_HEAD(&cpuset_ids, set, cs_link);
1464 set->cs_flags = CPU_SET_ROOT | CPU_SET_RDONLY;
1465 set->cs_domain = &domainset0;
1467 cpuset_root = &set->cs_mask;
1470 * Now derive a default (1), modifiable set from that to give out.
1472 set = uma_zalloc(cpuset_zone, M_WAITOK | M_ZERO);
1473 error = _cpuset_create(set, cpuset_zero, NULL, NULL, 1);
1474 KASSERT(error == 0, ("Error creating default set: %d\n", error));
1475 cpuset_default = set;
1477 * Create the kernel set (2).
1479 set = uma_zalloc(cpuset_zone, M_WAITOK | M_ZERO);
1480 error = _cpuset_create(set, cpuset_zero, NULL, NULL, 2);
1481 KASSERT(error == 0, ("Error creating kernel set: %d\n", error));
1482 set->cs_domain = &domainset2;
1483 cpuset_kernel = set;
1486 * Initialize the unit allocator. 0 and 1 are allocated above.
1488 cpuset_unr = new_unrhdr(2, INT_MAX, NULL);
1491 * If MD code has not initialized per-domain cpusets, place all
1494 for (i = 0; i < MAXMEMDOM; i++)
1495 if (!CPU_EMPTY(&cpuset_domain[i]))
1497 CPU_COPY(&all_cpus, &cpuset_domain[0]);
1500 return (cpuset_default);
1504 cpuset_kernthread(struct thread *td)
1509 set = td->td_cpuset;
1510 td->td_cpuset = cpuset_ref(cpuset_kernel);
1516 * Create a cpuset, which would be cpuset_create() but
1517 * mark the new 'set' as root.
1519 * We are not going to reparent the td to it. Use cpuset_setproc_update_set()
1522 * In case of no error, returns the set in *setp locked with a reference.
1525 cpuset_create_root(struct prison *pr, struct cpuset **setp)
1530 KASSERT(pr != NULL, ("[%s:%d] invalid pr", __func__, __LINE__));
1531 KASSERT(setp != NULL, ("[%s:%d] invalid setp", __func__, __LINE__));
1533 error = cpuset_create(setp, pr->pr_cpuset, &pr->pr_cpuset->cs_mask);
1537 KASSERT(*setp != NULL, ("[%s:%d] cpuset_create returned invalid data",
1538 __func__, __LINE__));
1540 /* Mark the set as root. */
1542 set->cs_flags |= CPU_SET_ROOT;
1548 cpuset_setproc_update_set(struct proc *p, struct cpuset *set)
1552 KASSERT(p != NULL, ("[%s:%d] invalid proc", __func__, __LINE__));
1553 KASSERT(set != NULL, ("[%s:%d] invalid set", __func__, __LINE__));
1556 error = cpuset_setproc(p->p_pid, set, NULL, NULL);
1563 #ifndef _SYS_SYSPROTO_H_
1564 struct cpuset_args {
1569 sys_cpuset(struct thread *td, struct cpuset_args *uap)
1571 struct cpuset *root;
1576 root = cpuset_refroot(td->td_cpuset);
1578 error = cpuset_create(&set, root, &root->cs_mask);
1582 error = copyout(&set->cs_id, uap->setid, sizeof(set->cs_id));
1584 error = cpuset_setproc(-1, set, NULL, NULL);
1589 #ifndef _SYS_SYSPROTO_H_
1590 struct cpuset_setid_args {
1597 sys_cpuset_setid(struct thread *td, struct cpuset_setid_args *uap)
1600 return (kern_cpuset_setid(td, uap->which, uap->id, uap->setid));
1604 kern_cpuset_setid(struct thread *td, cpuwhich_t which,
1605 id_t id, cpusetid_t setid)
1611 * Presently we only support per-process sets.
1613 if (which != CPU_WHICH_PID)
1615 set = cpuset_lookup(setid, td);
1618 error = cpuset_setproc(id, set, NULL, NULL);
1623 #ifndef _SYS_SYSPROTO_H_
1624 struct cpuset_getid_args {
1632 sys_cpuset_getid(struct thread *td, struct cpuset_getid_args *uap)
1635 return (kern_cpuset_getid(td, uap->level, uap->which, uap->id,
1640 kern_cpuset_getid(struct thread *td, cpulevel_t level, cpuwhich_t which,
1641 id_t id, cpusetid_t *setid)
1643 struct cpuset *nset;
1650 if (level == CPU_LEVEL_WHICH && which != CPU_WHICH_CPUSET)
1652 error = cpuset_which(which, id, &p, &ttd, &set);
1659 set = cpuset_refbase(ttd->td_cpuset);
1663 case CPU_WHICH_CPUSET:
1664 case CPU_WHICH_JAIL:
1667 case CPU_WHICH_DOMAIN:
1671 case CPU_LEVEL_ROOT:
1672 nset = cpuset_refroot(set);
1676 case CPU_LEVEL_CPUSET:
1678 case CPU_LEVEL_WHICH:
1684 error = copyout(&tmpid, setid, sizeof(tmpid));
1689 #ifndef _SYS_SYSPROTO_H_
1690 struct cpuset_getaffinity_args {
1699 sys_cpuset_getaffinity(struct thread *td, struct cpuset_getaffinity_args *uap)
1702 return (kern_cpuset_getaffinity(td, uap->level, uap->which,
1703 uap->id, uap->cpusetsize, uap->mask));
1707 kern_cpuset_getaffinity(struct thread *td, cpulevel_t level, cpuwhich_t which,
1708 id_t id, size_t cpusetsize, cpuset_t *maskp)
1711 struct cpuset *nset;
1718 if (cpusetsize < sizeof(cpuset_t) || cpusetsize > CPU_MAXSIZE / NBBY)
1720 /* In Capability mode, you can only get your own CPU set. */
1721 if (IN_CAPABILITY_MODE(td)) {
1722 if (level != CPU_LEVEL_WHICH)
1724 if (which != CPU_WHICH_TID && which != CPU_WHICH_PID)
1730 mask = malloc(size, M_TEMP, M_WAITOK | M_ZERO);
1731 error = cpuset_which(which, id, &p, &ttd, &set);
1735 case CPU_LEVEL_ROOT:
1736 case CPU_LEVEL_CPUSET:
1741 set = cpuset_ref(ttd->td_cpuset);
1744 case CPU_WHICH_CPUSET:
1745 case CPU_WHICH_JAIL:
1748 case CPU_WHICH_INTRHANDLER:
1749 case CPU_WHICH_ITHREAD:
1750 case CPU_WHICH_DOMAIN:
1754 if (level == CPU_LEVEL_ROOT)
1755 nset = cpuset_refroot(set);
1757 nset = cpuset_refbase(set);
1758 CPU_COPY(&nset->cs_mask, mask);
1761 case CPU_LEVEL_WHICH:
1765 CPU_COPY(&ttd->td_cpuset->cs_mask, mask);
1769 FOREACH_THREAD_IN_PROC(p, ttd) {
1771 CPU_OR(mask, &ttd->td_cpuset->cs_mask);
1775 case CPU_WHICH_CPUSET:
1776 case CPU_WHICH_JAIL:
1777 CPU_COPY(&set->cs_mask, mask);
1780 case CPU_WHICH_INTRHANDLER:
1781 case CPU_WHICH_ITHREAD:
1782 error = intr_getaffinity(id, which, mask);
1784 case CPU_WHICH_DOMAIN:
1785 if (id < 0 || id >= MAXMEMDOM)
1788 CPU_COPY(&cpuset_domain[id], mask);
1801 error = copyout(mask, maskp, size);
1807 #ifndef _SYS_SYSPROTO_H_
1808 struct cpuset_setaffinity_args {
1813 const cpuset_t *mask;
1817 sys_cpuset_setaffinity(struct thread *td, struct cpuset_setaffinity_args *uap)
1820 return (kern_cpuset_setaffinity(td, uap->level, uap->which,
1821 uap->id, uap->cpusetsize, uap->mask));
1825 kern_cpuset_setaffinity(struct thread *td, cpulevel_t level, cpuwhich_t which,
1826 id_t id, size_t cpusetsize, const cpuset_t *maskp)
1828 struct cpuset *nset;
1835 if (cpusetsize < sizeof(cpuset_t) || cpusetsize > CPU_MAXSIZE / NBBY)
1837 /* In Capability mode, you can only set your own CPU set. */
1838 if (IN_CAPABILITY_MODE(td)) {
1839 if (level != CPU_LEVEL_WHICH)
1841 if (which != CPU_WHICH_TID && which != CPU_WHICH_PID)
1846 mask = malloc(cpusetsize, M_TEMP, M_WAITOK | M_ZERO);
1847 error = copyin(maskp, mask, cpusetsize);
1851 * Verify that no high bits are set.
1853 if (cpusetsize > sizeof(cpuset_t)) {
1857 end = cp = (char *)&mask->__bits;
1859 cp += sizeof(cpuset_t);
1868 case CPU_LEVEL_ROOT:
1869 case CPU_LEVEL_CPUSET:
1870 error = cpuset_which(which, id, &p, &ttd, &set);
1877 set = cpuset_ref(ttd->td_cpuset);
1881 case CPU_WHICH_CPUSET:
1882 case CPU_WHICH_JAIL:
1885 case CPU_WHICH_INTRHANDLER:
1886 case CPU_WHICH_ITHREAD:
1887 case CPU_WHICH_DOMAIN:
1891 if (level == CPU_LEVEL_ROOT)
1892 nset = cpuset_refroot(set);
1894 nset = cpuset_refbase(set);
1895 error = cpuset_modify(nset, mask);
1899 case CPU_LEVEL_WHICH:
1902 error = cpuset_setthread(id, mask);
1905 error = cpuset_setproc(id, NULL, mask, NULL);
1907 case CPU_WHICH_CPUSET:
1908 case CPU_WHICH_JAIL:
1909 error = cpuset_which(which, id, &p, &ttd, &set);
1911 error = cpuset_modify(set, mask);
1916 case CPU_WHICH_INTRHANDLER:
1917 case CPU_WHICH_ITHREAD:
1918 error = intr_setaffinity(id, which, mask);
1934 #ifndef _SYS_SYSPROTO_H_
1935 struct cpuset_getdomain_args {
1939 size_t domainsetsize;
1945 sys_cpuset_getdomain(struct thread *td, struct cpuset_getdomain_args *uap)
1948 return (kern_cpuset_getdomain(td, uap->level, uap->which,
1949 uap->id, uap->domainsetsize, uap->mask, uap->policy));
1953 kern_cpuset_getdomain(struct thread *td, cpulevel_t level, cpuwhich_t which,
1954 id_t id, size_t domainsetsize, domainset_t *maskp, int *policyp)
1956 struct domainset outset;
1958 struct cpuset *nset;
1960 struct domainset *dset;
1965 if (domainsetsize < sizeof(domainset_t) ||
1966 domainsetsize > DOMAINSET_MAXSIZE / NBBY)
1968 /* In Capability mode, you can only get your own domain set. */
1969 if (IN_CAPABILITY_MODE(td)) {
1970 if (level != CPU_LEVEL_WHICH)
1972 if (which != CPU_WHICH_TID && which != CPU_WHICH_PID)
1977 mask = malloc(domainsetsize, M_TEMP, M_WAITOK | M_ZERO);
1978 bzero(&outset, sizeof(outset));
1979 error = cpuset_which(which, id, &p, &ttd, &set);
1983 case CPU_LEVEL_ROOT:
1984 case CPU_LEVEL_CPUSET:
1989 set = cpuset_ref(ttd->td_cpuset);
1992 case CPU_WHICH_CPUSET:
1993 case CPU_WHICH_JAIL:
1996 case CPU_WHICH_INTRHANDLER:
1997 case CPU_WHICH_ITHREAD:
1998 case CPU_WHICH_DOMAIN:
2002 if (level == CPU_LEVEL_ROOT)
2003 nset = cpuset_refroot(set);
2005 nset = cpuset_refbase(set);
2006 domainset_copy(nset->cs_domain, &outset);
2009 case CPU_LEVEL_WHICH:
2013 domainset_copy(ttd->td_cpuset->cs_domain, &outset);
2017 FOREACH_THREAD_IN_PROC(p, ttd) {
2019 dset = ttd->td_cpuset->cs_domain;
2020 /* Show all domains in the proc. */
2021 DOMAINSET_OR(&outset.ds_mask, &dset->ds_mask);
2022 /* Last policy wins. */
2023 outset.ds_policy = dset->ds_policy;
2024 outset.ds_prefer = dset->ds_prefer;
2028 case CPU_WHICH_CPUSET:
2029 case CPU_WHICH_JAIL:
2030 domainset_copy(set->cs_domain, &outset);
2033 case CPU_WHICH_INTRHANDLER:
2034 case CPU_WHICH_ITHREAD:
2035 case CPU_WHICH_DOMAIN:
2049 * Translate prefer into a set containing only the preferred domain,
2050 * not the entire fallback set.
2052 if (outset.ds_policy == DOMAINSET_POLICY_PREFER) {
2053 DOMAINSET_ZERO(&outset.ds_mask);
2054 DOMAINSET_SET(outset.ds_prefer, &outset.ds_mask);
2056 DOMAINSET_COPY(&outset.ds_mask, mask);
2058 error = copyout(mask, maskp, domainsetsize);
2060 if (suword32(policyp, outset.ds_policy) != 0)
2067 #ifndef _SYS_SYSPROTO_H_
2068 struct cpuset_setdomain_args {
2072 size_t domainsetsize;
2078 sys_cpuset_setdomain(struct thread *td, struct cpuset_setdomain_args *uap)
2081 return (kern_cpuset_setdomain(td, uap->level, uap->which,
2082 uap->id, uap->domainsetsize, uap->mask, uap->policy));
2086 kern_cpuset_setdomain(struct thread *td, cpulevel_t level, cpuwhich_t which,
2087 id_t id, size_t domainsetsize, const domainset_t *maskp, int policy)
2089 struct cpuset *nset;
2093 struct domainset domain;
2097 if (domainsetsize < sizeof(domainset_t) ||
2098 domainsetsize > DOMAINSET_MAXSIZE / NBBY)
2100 if (policy <= DOMAINSET_POLICY_INVALID ||
2101 policy > DOMAINSET_POLICY_MAX)
2103 /* In Capability mode, you can only set your own CPU set. */
2104 if (IN_CAPABILITY_MODE(td)) {
2105 if (level != CPU_LEVEL_WHICH)
2107 if (which != CPU_WHICH_TID && which != CPU_WHICH_PID)
2112 memset(&domain, 0, sizeof(domain));
2113 mask = malloc(domainsetsize, M_TEMP, M_WAITOK | M_ZERO);
2114 error = copyin(maskp, mask, domainsetsize);
2118 * Verify that no high bits are set.
2120 if (domainsetsize > sizeof(domainset_t)) {
2124 end = cp = (char *)&mask->__bits;
2125 end += domainsetsize;
2126 cp += sizeof(domainset_t);
2134 DOMAINSET_COPY(mask, &domain.ds_mask);
2135 domain.ds_policy = policy;
2137 /* Translate preferred policy into a mask and fallback. */
2138 if (policy == DOMAINSET_POLICY_PREFER) {
2139 /* Only support a single preferred domain. */
2140 if (DOMAINSET_COUNT(&domain.ds_mask) != 1) {
2144 domain.ds_prefer = DOMAINSET_FFS(&domain.ds_mask) - 1;
2145 /* This will be constrained by domainset_shadow(). */
2146 DOMAINSET_FILL(&domain.ds_mask);
2150 * When given an impossible policy, fall back to interleaving
2151 * across all domains
2153 if (domainset_empty_vm(&domain))
2154 domainset_copy(&domainset2, &domain);
2157 case CPU_LEVEL_ROOT:
2158 case CPU_LEVEL_CPUSET:
2159 error = cpuset_which(which, id, &p, &ttd, &set);
2166 set = cpuset_ref(ttd->td_cpuset);
2170 case CPU_WHICH_CPUSET:
2171 case CPU_WHICH_JAIL:
2174 case CPU_WHICH_INTRHANDLER:
2175 case CPU_WHICH_ITHREAD:
2176 case CPU_WHICH_DOMAIN:
2180 if (level == CPU_LEVEL_ROOT)
2181 nset = cpuset_refroot(set);
2183 nset = cpuset_refbase(set);
2184 error = cpuset_modify_domain(nset, &domain);
2188 case CPU_LEVEL_WHICH:
2191 error = _cpuset_setthread(id, NULL, &domain);
2194 error = cpuset_setproc(id, NULL, NULL, &domain);
2196 case CPU_WHICH_CPUSET:
2197 case CPU_WHICH_JAIL:
2198 error = cpuset_which(which, id, &p, &ttd, &set);
2200 error = cpuset_modify_domain(set, &domain);
2205 case CPU_WHICH_INTRHANDLER:
2206 case CPU_WHICH_ITHREAD:
2224 ddb_display_bitset(const struct bitset *set, int size)
2228 for (once = 0, bit = 0; bit < size; bit++) {
2229 if (CPU_ISSET(bit, set)) {
2231 db_printf("%d", bit);
2234 db_printf(",%d", bit);
2238 db_printf("<none>");
2242 ddb_display_cpuset(const cpuset_t *set)
2244 ddb_display_bitset((const struct bitset *)set, CPU_SETSIZE);
2248 ddb_display_domainset(const domainset_t *set)
2250 ddb_display_bitset((const struct bitset *)set, DOMAINSET_SETSIZE);
2253 DB_SHOW_COMMAND(cpusets, db_show_cpusets)
2257 LIST_FOREACH(set, &cpuset_ids, cs_link) {
2258 db_printf("set=%p id=%-6u ref=%-6d flags=0x%04x parent id=%d\n",
2259 set, set->cs_id, set->cs_ref, set->cs_flags,
2260 (set->cs_parent != NULL) ? set->cs_parent->cs_id : 0);
2261 db_printf(" cpu mask=");
2262 ddb_display_cpuset(&set->cs_mask);
2264 db_printf(" domain policy %d prefer %d mask=",
2265 set->cs_domain->ds_policy, set->cs_domain->ds_prefer);
2266 ddb_display_domainset(&set->cs_domain->ds_mask);
2273 DB_SHOW_COMMAND(domainsets, db_show_domainsets)
2275 struct domainset *set;
2277 LIST_FOREACH(set, &cpuset_domains, ds_link) {
2278 db_printf("set=%p policy %d prefer %d cnt %d\n",
2279 set, set->ds_policy, set->ds_prefer, set->ds_cnt);
2280 db_printf(" mask =");
2281 ddb_display_domainset(&set->ds_mask);