FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_mbuf.c
1 /*-
2 * Copyright (c) 2004, 2005,
3 * Bosko Milekic <bmilekic@FreeBSD.org>. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include "opt_mac.h"
32 #include "opt_param.h"
33
34 #include <sys/param.h>
35 #include <sys/malloc.h>
36 #include <sys/systm.h>
37 #include <sys/mbuf.h>
38 #include <sys/domain.h>
39 #include <sys/eventhandler.h>
40 #include <sys/kernel.h>
41 #include <sys/protosw.h>
42 #include <sys/smp.h>
43 #include <sys/sysctl.h>
44
45 #include <security/mac/mac_framework.h>
46
47 #include <vm/vm.h>
48 #include <vm/vm_page.h>
49 #include <vm/uma.h>
50 #include <vm/uma_int.h>
51 #include <vm/uma_dbg.h>
52
53 /*
54 * In FreeBSD, Mbufs and Mbuf Clusters are allocated from UMA
55 * Zones.
56 *
57 * Mbuf Clusters (2K, contiguous) are allocated from the Cluster
58 * Zone. The Zone can be capped at kern.ipc.nmbclusters, if the
59 * administrator so desires.
60 *
61 * Mbufs are allocated from a UMA Master Zone called the Mbuf
62 * Zone.
63 *
64 * Additionally, FreeBSD provides a Packet Zone, which it
65 * configures as a Secondary Zone to the Mbuf Master Zone,
66 * thus sharing backend Slab kegs with the Mbuf Master Zone.
67 *
68 * Thus common-case allocations and locking are simplified:
69 *
70 * m_clget() m_getcl()
71 * | |
72 * | .------------>[(Packet Cache)] m_get(), m_gethdr()
73 * | | [ Packet ] |
74 * [(Cluster Cache)] [ Secondary ] [ (Mbuf Cache) ]
75 * [ Cluster Zone ] [ Zone ] [ Mbuf Master Zone ]
76 * | \________ |
77 * [ Cluster Keg ] \ /
78 * | [ Mbuf Keg ]
79 * [ Cluster Slabs ] |
80 * | [ Mbuf Slabs ]
81 * \____________(VM)_________________/
82 *
83 *
84 * Whenever an object is allocated with uma_zalloc() out of
85 * one of the Zones its _ctor_ function is executed. The same
86 * for any deallocation through uma_zfree() the _dtor_ function
87 * is executed.
88 *
89 * Caches are per-CPU and are filled from the Master Zone.
90 *
91 * Whenever an object is allocated from the underlying global
92 * memory pool it gets pre-initialized with the _zinit_ functions.
93 * When the Keg's are overfull objects get decomissioned with
94 * _zfini_ functions and free'd back to the global memory pool.
95 *
96 */
97
98 int nmbclusters; /* limits number of mbuf clusters */
99 int nmbjumbop; /* limits number of page size jumbo clusters */
100 int nmbjumbo9; /* limits number of 9k jumbo clusters */
101 int nmbjumbo16; /* limits number of 16k jumbo clusters */
102 struct mbstat mbstat;
103
104 static void
105 tunable_mbinit(void *dummy)
106 {
107
108 /* This has to be done before VM init. */
109 nmbclusters = 1024 + maxusers * 64;
110 nmbjumbop = nmbclusters / 2;
111 nmbjumbo9 = nmbjumbop / 2;
112 nmbjumbo16 = nmbjumbo9 / 2;
113 TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters);
114 }
115 SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_ANY, tunable_mbinit, NULL);
116
117 /* XXX: These should be tuneables. Can't change UMA limits on the fly. */
118 static int
119 sysctl_nmbclusters(SYSCTL_HANDLER_ARGS)
120 {
121 int error, newnmbclusters;
122
123 newnmbclusters = nmbclusters;
124 error = sysctl_handle_int(oidp, &newnmbclusters, 0, req);
125 if (error == 0 && req->newptr) {
126 if (newnmbclusters > nmbclusters) {
127 nmbclusters = newnmbclusters;
128 uma_zone_set_max(zone_clust, nmbclusters);
129 EVENTHANDLER_INVOKE(nmbclusters_change);
130 } else
131 error = EINVAL;
132 }
133 return (error);
134 }
135 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbclusters, CTLTYPE_INT|CTLFLAG_RW,
136 &nmbclusters, 0, sysctl_nmbclusters, "IU",
137 "Maximum number of mbuf clusters allowed");
138
139 static int
140 sysctl_nmbjumbop(SYSCTL_HANDLER_ARGS)
141 {
142 int error, newnmbjumbop;
143
144 newnmbjumbop = nmbjumbop;
145 error = sysctl_handle_int(oidp, &newnmbjumbop, 0, req);
146 if (error == 0 && req->newptr) {
147 if (newnmbjumbop> nmbjumbop) {
148 nmbjumbop = newnmbjumbop;
149 uma_zone_set_max(zone_jumbop, nmbjumbop);
150 } else
151 error = EINVAL;
152 }
153 return (error);
154 }
155 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbop, CTLTYPE_INT|CTLFLAG_RW,
156 &nmbjumbop, 0, sysctl_nmbjumbop, "IU",
157 "Maximum number of mbuf page size jumbo clusters allowed");
158
159
160 static int
161 sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS)
162 {
163 int error, newnmbjumbo9;
164
165 newnmbjumbo9 = nmbjumbo9;
166 error = sysctl_handle_int(oidp, &newnmbjumbo9, 0, req);
167 if (error == 0 && req->newptr) {
168 if (newnmbjumbo9> nmbjumbo9) {
169 nmbjumbo9 = newnmbjumbo9;
170 uma_zone_set_max(zone_jumbo9, nmbjumbo9);
171 } else
172 error = EINVAL;
173 }
174 return (error);
175 }
176 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo9, CTLTYPE_INT|CTLFLAG_RW,
177 &nmbjumbo9, 0, sysctl_nmbjumbo9, "IU",
178 "Maximum number of mbuf 9k jumbo clusters allowed");
179
180 static int
181 sysctl_nmbjumbo16(SYSCTL_HANDLER_ARGS)
182 {
183 int error, newnmbjumbo16;
184
185 newnmbjumbo16 = nmbjumbo16;
186 error = sysctl_handle_int(oidp, &newnmbjumbo16, 0, req);
187 if (error == 0 && req->newptr) {
188 if (newnmbjumbo16> nmbjumbo16) {
189 nmbjumbo16 = newnmbjumbo16;
190 uma_zone_set_max(zone_jumbo16, nmbjumbo16);
191 } else
192 error = EINVAL;
193 }
194 return (error);
195 }
196 SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo16, CTLTYPE_INT|CTLFLAG_RW,
197 &nmbjumbo16, 0, sysctl_nmbjumbo16, "IU",
198 "Maximum number of mbuf 16k jumbo clusters allowed");
199
200
201
202 SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat,
203 "Mbuf general information and statistics");
204
205 /*
206 * Zones from which we allocate.
207 */
208 uma_zone_t zone_mbuf;
209 uma_zone_t zone_clust;
210 uma_zone_t zone_pack;
211 uma_zone_t zone_jumbop;
212 uma_zone_t zone_jumbo9;
213 uma_zone_t zone_jumbo16;
214 uma_zone_t zone_ext_refcnt;
215
216 /*
217 * Local prototypes.
218 */
219 static int mb_ctor_mbuf(void *, int, void *, int);
220 static int mb_ctor_clust(void *, int, void *, int);
221 static int mb_ctor_pack(void *, int, void *, int);
222 static void mb_dtor_mbuf(void *, int, void *);
223 static void mb_dtor_clust(void *, int, void *);
224 static void mb_dtor_pack(void *, int, void *);
225 static int mb_zinit_pack(void *, int, int);
226 static void mb_zfini_pack(void *, int);
227
228 static void mb_reclaim(void *);
229 static void mbuf_init(void *);
230
231 /* Ensure that MSIZE doesn't break dtom() - it must be a power of 2 */
232 CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >> 1 == MSIZE);
233
234 /*
235 * Initialize FreeBSD Network buffer allocation.
236 */
237 SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL)
238 static void
239 mbuf_init(void *dummy)
240 {
241
242 /*
243 * Configure UMA zones for Mbufs, Clusters, and Packets.
244 */
245 zone_mbuf = uma_zcreate(MBUF_MEM_NAME, MSIZE,
246 mb_ctor_mbuf, mb_dtor_mbuf,
247 #ifdef INVARIANTS
248 trash_init, trash_fini,
249 #else
250 NULL, NULL,
251 #endif
252 MSIZE - 1, UMA_ZONE_MAXBUCKET);
253
254 zone_clust = uma_zcreate(MBUF_CLUSTER_MEM_NAME, MCLBYTES,
255 mb_ctor_clust, mb_dtor_clust,
256 #ifdef INVARIANTS
257 trash_init, trash_fini,
258 #else
259 NULL, NULL,
260 #endif
261 UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
262 if (nmbclusters > 0)
263 uma_zone_set_max(zone_clust, nmbclusters);
264
265 zone_pack = uma_zsecond_create(MBUF_PACKET_MEM_NAME, mb_ctor_pack,
266 mb_dtor_pack, mb_zinit_pack, mb_zfini_pack, zone_mbuf);
267
268 /* Make jumbo frame zone too. Page size, 9k and 16k. */
269 zone_jumbop = uma_zcreate(MBUF_JUMBOP_MEM_NAME, MJUMPAGESIZE,
270 mb_ctor_clust, mb_dtor_clust,
271 #ifdef INVARIANTS
272 trash_init, trash_fini,
273 #else
274 NULL, NULL,
275 #endif
276 UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
277 if (nmbjumbop > 0)
278 uma_zone_set_max(zone_jumbop, nmbjumbop);
279
280 zone_jumbo9 = uma_zcreate(MBUF_JUMBO9_MEM_NAME, MJUM9BYTES,
281 mb_ctor_clust, mb_dtor_clust,
282 #ifdef INVARIANTS
283 trash_init, trash_fini,
284 #else
285 NULL, NULL,
286 #endif
287 UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
288 if (nmbjumbo9 > 0)
289 uma_zone_set_max(zone_jumbo9, nmbjumbo9);
290
291 zone_jumbo16 = uma_zcreate(MBUF_JUMBO16_MEM_NAME, MJUM16BYTES,
292 mb_ctor_clust, mb_dtor_clust,
293 #ifdef INVARIANTS
294 trash_init, trash_fini,
295 #else
296 NULL, NULL,
297 #endif
298 UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
299 if (nmbjumbo16 > 0)
300 uma_zone_set_max(zone_jumbo16, nmbjumbo16);
301
302 zone_ext_refcnt = uma_zcreate(MBUF_EXTREFCNT_MEM_NAME, sizeof(u_int),
303 NULL, NULL,
304 NULL, NULL,
305 UMA_ALIGN_PTR, UMA_ZONE_ZINIT);
306
307 /* uma_prealloc() goes here... */
308
309 /*
310 * Hook event handler for low-memory situation, used to
311 * drain protocols and push data back to the caches (UMA
312 * later pushes it back to VM).
313 */
314 EVENTHANDLER_REGISTER(vm_lowmem, mb_reclaim, NULL,
315 EVENTHANDLER_PRI_FIRST);
316
317 /*
318 * [Re]set counters and local statistics knobs.
319 * XXX Some of these should go and be replaced, but UMA stat
320 * gathering needs to be revised.
321 */
322 mbstat.m_mbufs = 0;
323 mbstat.m_mclusts = 0;
324 mbstat.m_drain = 0;
325 mbstat.m_msize = MSIZE;
326 mbstat.m_mclbytes = MCLBYTES;
327 mbstat.m_minclsize = MINCLSIZE;
328 mbstat.m_mlen = MLEN;
329 mbstat.m_mhlen = MHLEN;
330 mbstat.m_numtypes = MT_NTYPES;
331
332 mbstat.m_mcfail = mbstat.m_mpfail = 0;
333 mbstat.sf_iocnt = 0;
334 mbstat.sf_allocwait = mbstat.sf_allocfail = 0;
335 }
336
337 /*
338 * Constructor for Mbuf master zone.
339 *
340 * The 'arg' pointer points to a mb_args structure which
341 * contains call-specific information required to support the
342 * mbuf allocation API. See mbuf.h.
343 */
344 static int
345 mb_ctor_mbuf(void *mem, int size, void *arg, int how)
346 {
347 struct mbuf *m;
348 struct mb_args *args;
349 #ifdef MAC
350 int error;
351 #endif
352 int flags;
353 short type;
354
355 #ifdef INVARIANTS
356 trash_ctor(mem, size, arg, how);
357 #endif
358 m = (struct mbuf *)mem;
359 args = (struct mb_args *)arg;
360 flags = args->flags;
361 type = args->type;
362
363 /*
364 * The mbuf is initialized later. The caller has the
365 * responsibility to set up any MAC labels too.
366 */
367 if (type == MT_NOINIT)
368 return (0);
369
370 m->m_next = NULL;
371 m->m_nextpkt = NULL;
372 m->m_len = 0;
373 m->m_flags = flags;
374 m->m_type = type;
375 if (flags & M_PKTHDR) {
376 m->m_data = m->m_pktdat;
377 m->m_pkthdr.rcvif = NULL;
378 m->m_pkthdr.len = 0;
379 m->m_pkthdr.header = NULL;
380 m->m_pkthdr.csum_flags = 0;
381 m->m_pkthdr.csum_data = 0;
382 m->m_pkthdr.tso_segsz = 0;
383 m->m_pkthdr.ether_vtag = 0;
384 SLIST_INIT(&m->m_pkthdr.tags);
385 #ifdef MAC
386 /* If the label init fails, fail the alloc */
387 error = mac_init_mbuf(m, how);
388 if (error)
389 return (error);
390 #endif
391 } else
392 m->m_data = m->m_dat;
393 return (0);
394 }
395
396 /*
397 * The Mbuf master zone destructor.
398 */
399 static void
400 mb_dtor_mbuf(void *mem, int size, void *arg)
401 {
402 struct mbuf *m;
403 unsigned long flags;
404
405 m = (struct mbuf *)mem;
406 flags = (unsigned long)arg;
407
408 if ((flags & MB_NOTAGS) == 0 && (m->m_flags & M_PKTHDR) != 0)
409 m_tag_delete_chain(m, NULL);
410 KASSERT((m->m_flags & M_EXT) == 0, ("%s: M_EXT set", __func__));
411 KASSERT((m->m_flags & M_NOFREE) == 0, ("%s: M_NOFREE set", __func__));
412 #ifdef INVARIANTS
413 trash_dtor(mem, size, arg);
414 #endif
415 }
416
417 /*
418 * The Mbuf Packet zone destructor.
419 */
420 static void
421 mb_dtor_pack(void *mem, int size, void *arg)
422 {
423 struct mbuf *m;
424
425 m = (struct mbuf *)mem;
426 if ((m->m_flags & M_PKTHDR) != 0)
427 m_tag_delete_chain(m, NULL);
428
429 /* Make sure we've got a clean cluster back. */
430 KASSERT((m->m_flags & M_EXT) == M_EXT, ("%s: M_EXT not set", __func__));
431 KASSERT(m->m_ext.ext_buf != NULL, ("%s: ext_buf == NULL", __func__));
432 KASSERT(m->m_ext.ext_free == NULL, ("%s: ext_free != NULL", __func__));
433 KASSERT(m->m_ext.ext_args == NULL, ("%s: ext_args != NULL", __func__));
434 KASSERT(m->m_ext.ext_size == MCLBYTES, ("%s: ext_size != MCLBYTES", __func__));
435 KASSERT(m->m_ext.ext_type == EXT_PACKET, ("%s: ext_type != EXT_PACKET", __func__));
436 KASSERT(*m->m_ext.ref_cnt == 1, ("%s: ref_cnt != 1", __func__));
437 #ifdef INVARIANTS
438 trash_dtor(m->m_ext.ext_buf, MCLBYTES, arg);
439 #endif
440 /*
441 * If there are processes blocked on zone_clust, waiting for pages to be freed up,
442 * cause them to be woken up by draining the packet zone. We are exposed to a race here
443 * (in the check for the UMA_ZFLAG_FULL) where we might miss the flag set, but that is
444 * deliberate. We don't want to acquire the zone lock for every mbuf free.
445 */
446 if (uma_zone_exhausted_nolock(zone_clust))
447 zone_drain(zone_pack);
448 }
449
450 /*
451 * The Cluster and Jumbo[PAGESIZE|9|16] zone constructor.
452 *
453 * Here the 'arg' pointer points to the Mbuf which we
454 * are configuring cluster storage for. If 'arg' is
455 * empty we allocate just the cluster without setting
456 * the mbuf to it. See mbuf.h.
457 */
458 static int
459 mb_ctor_clust(void *mem, int size, void *arg, int how)
460 {
461 struct mbuf *m;
462 u_int *refcnt;
463 int type;
464 uma_zone_t zone;
465
466 #ifdef INVARIANTS
467 trash_ctor(mem, size, arg, how);
468 #endif
469 switch (size) {
470 case MCLBYTES:
471 type = EXT_CLUSTER;
472 zone = zone_clust;
473 break;
474 #if MJUMPAGESIZE != MCLBYTES
475 case MJUMPAGESIZE:
476 type = EXT_JUMBOP;
477 zone = zone_jumbop;
478 break;
479 #endif
480 case MJUM9BYTES:
481 type = EXT_JUMBO9;
482 zone = zone_jumbo9;
483 break;
484 case MJUM16BYTES:
485 type = EXT_JUMBO16;
486 zone = zone_jumbo16;
487 break;
488 default:
489 panic("unknown cluster size");
490 break;
491 }
492
493 m = (struct mbuf *)arg;
494 refcnt = uma_find_refcnt(zone, mem);
495 *refcnt = 1;
496 if (m != NULL) {
497 m->m_ext.ext_buf = (caddr_t)mem;
498 m->m_data = m->m_ext.ext_buf;
499 m->m_flags |= M_EXT;
500 m->m_ext.ext_free = NULL;
501 m->m_ext.ext_args = NULL;
502 m->m_ext.ext_size = size;
503 m->m_ext.ext_type = type;
504 m->m_ext.ref_cnt = refcnt;
505 }
506
507 return (0);
508 }
509
510 /*
511 * The Mbuf Cluster zone destructor.
512 */
513 static void
514 mb_dtor_clust(void *mem, int size, void *arg)
515 {
516 #ifdef INVARIANTS
517 uma_zone_t zone;
518
519 zone = m_getzone(size);
520 KASSERT(*(uma_find_refcnt(zone, mem)) <= 1,
521 ("%s: refcnt incorrect %u", __func__,
522 *(uma_find_refcnt(zone, mem))) );
523
524 trash_dtor(mem, size, arg);
525 #endif
526 }
527
528 /*
529 * The Packet secondary zone's init routine, executed on the
530 * object's transition from mbuf keg slab to zone cache.
531 */
532 static int
533 mb_zinit_pack(void *mem, int size, int how)
534 {
535 struct mbuf *m;
536
537 m = (struct mbuf *)mem; /* m is virgin. */
538 if (uma_zalloc_arg(zone_clust, m, how) == NULL ||
539 m->m_ext.ext_buf == NULL)
540 return (ENOMEM);
541 m->m_ext.ext_type = EXT_PACKET; /* Override. */
542 #ifdef INVARIANTS
543 trash_init(m->m_ext.ext_buf, MCLBYTES, how);
544 #endif
545 return (0);
546 }
547
548 /*
549 * The Packet secondary zone's fini routine, executed on the
550 * object's transition from zone cache to keg slab.
551 */
552 static void
553 mb_zfini_pack(void *mem, int size)
554 {
555 struct mbuf *m;
556
557 m = (struct mbuf *)mem;
558 #ifdef INVARIANTS
559 trash_fini(m->m_ext.ext_buf, MCLBYTES);
560 #endif
561 uma_zfree_arg(zone_clust, m->m_ext.ext_buf, NULL);
562 #ifdef INVARIANTS
563 trash_dtor(mem, size, NULL);
564 #endif
565 }
566
567 /*
568 * The "packet" keg constructor.
569 */
570 static int
571 mb_ctor_pack(void *mem, int size, void *arg, int how)
572 {
573 struct mbuf *m;
574 struct mb_args *args;
575 #ifdef MAC
576 int error;
577 #endif
578 int flags;
579 short type;
580
581 m = (struct mbuf *)mem;
582 args = (struct mb_args *)arg;
583 flags = args->flags;
584 type = args->type;
585
586 #ifdef INVARIANTS
587 trash_ctor(m->m_ext.ext_buf, MCLBYTES, arg, how);
588 #endif
589 m->m_next = NULL;
590 m->m_nextpkt = NULL;
591 m->m_data = m->m_ext.ext_buf;
592 m->m_len = 0;
593 m->m_flags = (flags | M_EXT);
594 m->m_type = type;
595
596 if (flags & M_PKTHDR) {
597 m->m_pkthdr.rcvif = NULL;
598 m->m_pkthdr.len = 0;
599 m->m_pkthdr.header = NULL;
600 m->m_pkthdr.csum_flags = 0;
601 m->m_pkthdr.csum_data = 0;
602 m->m_pkthdr.tso_segsz = 0;
603 m->m_pkthdr.ether_vtag = 0;
604 SLIST_INIT(&m->m_pkthdr.tags);
605 #ifdef MAC
606 /* If the label init fails, fail the alloc */
607 error = mac_init_mbuf(m, how);
608 if (error)
609 return (error);
610 #endif
611 }
612 /* m_ext is already initialized. */
613
614 return (0);
615 }
616
617 /*
618 * This is the protocol drain routine.
619 *
620 * No locks should be held when this is called. The drain routines have to
621 * presently acquire some locks which raises the possibility of lock order
622 * reversal.
623 */
624 static void
625 mb_reclaim(void *junk)
626 {
627 struct domain *dp;
628 struct protosw *pr;
629
630 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK | WARN_PANIC, NULL,
631 "mb_reclaim()");
632
633 for (dp = domains; dp != NULL; dp = dp->dom_next)
634 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
635 if (pr->pr_drain != NULL)
636 (*pr->pr_drain)();
637 }
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