vm_domainset.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2017,  Jeffrey Roberson <jeff@freebsd.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice unmodified, this list of conditions, and the following
   12  *    disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include "opt_vm.h"
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/bitset.h>
   38 #include <sys/domainset.h>
   39 #include <sys/proc.h>
   40 #include <sys/lock.h>
   41 #include <sys/mutex.h>
   42 #include <sys/malloc.h>
   43 #include <sys/rwlock.h>
   44 #include <sys/vmmeter.h>
   45 
   46 #include <vm/vm.h>
   47 #include <vm/vm_param.h>
   48 #include <vm/vm_domainset.h>
   49 #include <vm/vm_object.h>
   50 #include <vm/vm_page.h>
   51 #include <vm/vm_phys.h>
   52 
   53 #ifdef NUMA
   54 /*
   55  * Iterators are written such that the first nowait pass has as short a
   56  * codepath as possible to eliminate bloat from the allocator.  It is
   57  * assumed that most allocations are successful.
   58  */
   59 
   60 static int vm_domainset_default_stride = 64;
   61 
   62 /*
   63  * Determine which policy is to be used for this allocation.
   64  */
   65 static void
   66 vm_domainset_iter_init(struct vm_domainset_iter *di, struct domainset *ds,
   67     int *iter, struct vm_object *obj, vm_pindex_t pindex)
   68 {
   69 
   70         di->di_domain = ds;
   71         di->di_iter = iter;
   72         di->di_policy = ds->ds_policy;
   73         if (di->di_policy == DOMAINSET_POLICY_INTERLEAVE) {
   74 #if VM_NRESERVLEVEL > 0
   75                 if (vm_object_reserv(obj)) {
   76                         /*
   77                          * Color the pindex so we end up on the correct
   78                          * reservation boundary.
   79                          */
   80                         pindex += obj->pg_color;
   81                         pindex >>= VM_LEVEL_0_ORDER;
   82                 } else
   83 #endif
   84                         pindex /= vm_domainset_default_stride;
   85                 /*
   86                  * Offset pindex so the first page of each object does
   87                  * not end up in domain 0.
   88                  */
   89                 if (obj != NULL)
   90                         pindex += (((uintptr_t)obj) / sizeof(*obj));
   91                 di->di_offset = pindex;
   92         }
   93         /* Skip domains below min on the first pass. */
   94         di->di_minskip = true;
   95 }
   96 
   97 static void
   98 vm_domainset_iter_rr(struct vm_domainset_iter *di, int *domain)
   99 {
  100 
  101         *domain = di->di_domain->ds_order[
  102             ++(*di->di_iter) % di->di_domain->ds_cnt];
  103 }
  104 
  105 static void
  106 vm_domainset_iter_prefer(struct vm_domainset_iter *di, int *domain)
  107 {
  108         int d;
  109 
  110         do {
  111                 d = di->di_domain->ds_order[
  112                     ++(*di->di_iter) % di->di_domain->ds_cnt];
  113         } while (d == di->di_domain->ds_prefer);
  114         *domain = d;
  115 }
  116 
  117 static void
  118 vm_domainset_iter_interleave(struct vm_domainset_iter *di, int *domain)
  119 {
  120         int d;
  121 
  122         d = di->di_offset % di->di_domain->ds_cnt;
  123         *di->di_iter = d;
  124         *domain = di->di_domain->ds_order[d];
  125 }
  126 
  127 static void
  128 vm_domainset_iter_next(struct vm_domainset_iter *di, int *domain)
  129 {
  130 
  131         KASSERT(di->di_n > 0,
  132             ("vm_domainset_iter_first: Invalid n %d", di->di_n));
  133         switch (di->di_policy) {
  134         case DOMAINSET_POLICY_FIRSTTOUCH:
  135                 /*
  136                  * To prevent impossible allocations we convert an invalid
  137                  * first-touch to round-robin.
  138                  */
  139                 /* FALLTHROUGH */
  140         case DOMAINSET_POLICY_INTERLEAVE:
  141                 /* FALLTHROUGH */
  142         case DOMAINSET_POLICY_ROUNDROBIN:
  143                 vm_domainset_iter_rr(di, domain);
  144                 break;
  145         case DOMAINSET_POLICY_PREFER:
  146                 vm_domainset_iter_prefer(di, domain);
  147                 break;
  148         default:
  149                 panic("vm_domainset_iter_first: Unknown policy %d",
  150                     di->di_policy);
  151         }
  152         KASSERT(*domain < vm_ndomains,
  153             ("vm_domainset_iter_next: Invalid domain %d", *domain));
  154 }
  155 
  156 static void
  157 vm_domainset_iter_first(struct vm_domainset_iter *di, int *domain)
  158 {
  159 
  160         switch (di->di_policy) {
  161         case DOMAINSET_POLICY_FIRSTTOUCH:
  162                 *domain = PCPU_GET(domain);
  163                 if (DOMAINSET_ISSET(*domain, &di->di_domain->ds_mask)) {
  164                         /*
  165                          * Add an extra iteration because we will visit the
  166                          * current domain a second time in the rr iterator.
  167                          */
  168                         di->di_n = di->di_domain->ds_cnt + 1;
  169                         break;
  170                 }
  171                 /*
  172                  * To prevent impossible allocations we convert an invalid
  173                  * first-touch to round-robin.
  174                  */
  175                 /* FALLTHROUGH */
  176         case DOMAINSET_POLICY_ROUNDROBIN:
  177                 di->di_n = di->di_domain->ds_cnt;
  178                 vm_domainset_iter_rr(di, domain);
  179                 break;
  180         case DOMAINSET_POLICY_PREFER:
  181                 *domain = di->di_domain->ds_prefer;
  182                 di->di_n = di->di_domain->ds_cnt;
  183                 break;
  184         case DOMAINSET_POLICY_INTERLEAVE:
  185                 vm_domainset_iter_interleave(di, domain);
  186                 di->di_n = di->di_domain->ds_cnt;
  187                 break;
  188         default:
  189                 panic("vm_domainset_iter_first: Unknown policy %d",
  190                     di->di_policy);
  191         }
  192         KASSERT(di->di_n > 0,
  193             ("vm_domainset_iter_first: Invalid n %d", di->di_n));
  194         KASSERT(*domain < vm_ndomains,
  195             ("vm_domainset_iter_first: Invalid domain %d", *domain));
  196 }
  197 
  198 void
  199 vm_domainset_iter_page_init(struct vm_domainset_iter *di, struct vm_object *obj,
  200     vm_pindex_t pindex, int *domain, int *req)
  201 {
  202         struct domainset_ref *dr;
  203 
  204         /*
  205          * Object policy takes precedence over thread policy.  The policies
  206          * are immutable and unsynchronized.  Updates can race but pointer
  207          * loads are assumed to be atomic.
  208          */
  209         if (obj != NULL && obj->domain.dr_policy != NULL)
  210                 dr = &obj->domain;
  211         else
  212                 dr = &curthread->td_domain;
  213         vm_domainset_iter_init(di, dr->dr_policy, &dr->dr_iter, obj, pindex);
  214         di->di_flags = *req;
  215         *req = (di->di_flags & ~(VM_ALLOC_WAITOK | VM_ALLOC_WAITFAIL)) |
  216             VM_ALLOC_NOWAIT;
  217         vm_domainset_iter_first(di, domain);
  218         if (vm_page_count_min_domain(*domain))
  219                 vm_domainset_iter_page(di, obj, domain);
  220 }
  221 
  222 int
  223 vm_domainset_iter_page(struct vm_domainset_iter *di, struct vm_object *obj,
  224     int *domain)
  225 {
  226 
  227         /* If there are more domains to visit we run the iterator. */
  228         while (--di->di_n != 0) {
  229                 vm_domainset_iter_next(di, domain);
  230                 if (!di->di_minskip || !vm_page_count_min_domain(*domain))
  231                         return (0);
  232         }
  233 
  234         /* If we skipped domains below min restart the search. */
  235         if (di->di_minskip) {
  236                 di->di_minskip = false;
  237                 vm_domainset_iter_first(di, domain);
  238                 return (0);
  239         }
  240 
  241         /* If we visited all domains and this was a NOWAIT we return error. */
  242         if ((di->di_flags & (VM_ALLOC_WAITOK | VM_ALLOC_WAITFAIL)) == 0)
  243                 return (ENOMEM);
  244 
  245         /* Wait for one of the domains to accumulate some free pages. */
  246         if (obj != NULL)
  247                 VM_OBJECT_WUNLOCK(obj);
  248         vm_wait_doms(&di->di_domain->ds_mask, 0);
  249         if (obj != NULL)
  250                 VM_OBJECT_WLOCK(obj);
  251         if ((di->di_flags & VM_ALLOC_WAITFAIL) != 0)
  252                 return (ENOMEM);
  253 
  254         /* Restart the search. */
  255         vm_domainset_iter_first(di, domain);
  256 
  257         return (0);
  258 }
  259 
  260 static void
  261 _vm_domainset_iter_policy_init(struct vm_domainset_iter *di, int *domain,
  262     int *flags)
  263 {
  264 
  265         di->di_flags = *flags;
  266         *flags = (di->di_flags & ~M_WAITOK) | M_NOWAIT;
  267         vm_domainset_iter_first(di, domain);
  268         if (vm_page_count_min_domain(*domain))
  269                 vm_domainset_iter_policy(di, domain);
  270 }
  271 
  272 void
  273 vm_domainset_iter_policy_init(struct vm_domainset_iter *di,
  274     struct domainset *ds, int *domain, int *flags)
  275 {
  276 
  277         vm_domainset_iter_init(di, ds, &curthread->td_domain.dr_iter, NULL, 0);
  278         _vm_domainset_iter_policy_init(di, domain, flags);
  279 }
  280 
  281 void
  282 vm_domainset_iter_policy_ref_init(struct vm_domainset_iter *di,
  283     struct domainset_ref *dr, int *domain, int *flags)
  284 {
  285 
  286         vm_domainset_iter_init(di, dr->dr_policy, &dr->dr_iter, NULL, 0);
  287         _vm_domainset_iter_policy_init(di, domain, flags);
  288 }
  289 
  290 int
  291 vm_domainset_iter_policy(struct vm_domainset_iter *di, int *domain)
  292 {
  293 
  294         /* If there are more domains to visit we run the iterator. */
  295         while (--di->di_n != 0) {
  296                 vm_domainset_iter_next(di, domain);
  297                 if (!di->di_minskip || !vm_page_count_min_domain(*domain))
  298                         return (0);
  299         }
  300 
  301         /* If we skipped domains below min restart the search. */
  302         if (di->di_minskip) {
  303                 di->di_minskip = false;
  304                 vm_domainset_iter_first(di, domain);
  305                 return (0);
  306         }
  307 
  308         /* If we visited all domains and this was a NOWAIT we return error. */
  309         if ((di->di_flags & M_WAITOK) == 0)
  310                 return (ENOMEM);
  311 
  312         /* Wait for one of the domains to accumulate some free pages. */
  313         vm_wait_doms(&di->di_domain->ds_mask, 0);
  314 
  315         /* Restart the search. */
  316         vm_domainset_iter_first(di, domain);
  317 
  318         return (0);
  319 }
  320 
  321 #else /* !NUMA */
  322 
  323 int
  324 vm_domainset_iter_page(struct vm_domainset_iter *di, struct vm_object *obj,
  325     int *domain)
  326 {
  327 
  328         return (EJUSTRETURN);
  329 }
  330 
  331 void
  332 vm_domainset_iter_page_init(struct vm_domainset_iter *di, struct vm_object *obj,
  333     vm_pindex_t pindex, int *domain, int *flags)
  334 {
  335 
  336         *domain = 0;
  337 }
  338 
  339 int
  340 vm_domainset_iter_policy(struct vm_domainset_iter *di, int *domain)
  341 {
  342 
  343         return (EJUSTRETURN);
  344 }
  345 
  346 void
  347 vm_domainset_iter_policy_init(struct vm_domainset_iter *di,
  348     struct domainset *ds, int *domain, int *flags)
  349 {
  350 
  351         *domain = 0;
  352 }
  353 
  354 void
  355 vm_domainset_iter_policy_ref_init(struct vm_domainset_iter *di,
  356     struct domainset_ref *dr, int *domain, int *flags)
  357 {
  358 
  359         *domain = 0;
  360 }
  361 
  362 #endif /* NUMA */
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FreeBSD/Linux Kernel Cross Reference sys/vm/vm_domainset.c

FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_domainset.c
