2 *------------------------------------------------------------------
3 * svm.c - shared VM allocation, mmap(...MAP_FIXED...)
6 * Copyright (c) 2009 Cisco and/or its affiliates.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at:
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *------------------------------------------------------------------
23 #include <sys/types.h>
26 #include <netinet/in.h>
33 #include <vppinfra/clib.h>
34 #include <vppinfra/vec.h>
35 #include <vppinfra/hash.h>
36 #include <vppinfra/bitmap.h>
37 #include <vppinfra/fifo.h>
38 #include <vppinfra/time.h>
39 #include <vppinfra/mheap.h>
40 #include <vppinfra/heap.h>
41 #include <vppinfra/pool.h>
42 #include <vppinfra/format.h>
46 static svm_region_t *root_rp;
47 static int root_rp_refcount;
50 static pthread_mutex_t *mutexes_held [MAXLOCK];
53 svm_region_t *svm_get_root_rp (void)
60 static void region_lock(svm_region_t *rp, int tag)
62 pthread_mutex_lock(&rp->mutex);
64 rp->mutex_owner_pid = getpid();
65 rp->mutex_owner_tag = tag;
67 ASSERT(nheld < MAXLOCK);
69 * Keep score of held mutexes so we can try to exit
70 * cleanly if the world comes to an end at the worst possible
73 mutexes_held [nheld++] = &rp->mutex;
76 static void region_unlock(svm_region_t *rp)
80 rp->mutex_owner_pid = 0;
81 rp->mutex_owner_tag = 0;
84 for (i = nheld-1; i >= 0; i--) {
85 if (mutexes_held[i] == &rp->mutex) {
86 for (j = i; j < MAXLOCK-1; j++)
87 mutexes_held[j] = mutexes_held[j+1];
95 CLIB_MEMORY_BARRIER();
96 pthread_mutex_unlock(&rp->mutex);
100 static u8 * format_svm_flags (u8 * s, va_list * args)
102 uword f = va_arg (*args, uword);
104 if (f & SVM_FLAGS_MHEAP)
105 s = format (s, "MHEAP ");
106 if (f & SVM_FLAGS_FILE)
107 s = format (s, "FILE ");
108 if (f & SVM_FLAGS_NODATA)
109 s = format (s, "NODATA ");
110 if (f & SVM_FLAGS_NEED_DATA_INIT)
111 s = format (s, "INIT ");
116 static u8 * format_svm_size (u8 * s, va_list * args)
118 uword size = va_arg (*args, uword);
120 if (size >= (1<<20)) {
121 s = format (s, "(%d mb)", size >> 20);
122 } else if (size >= (1<<10)) {
123 s = format (s, "(%d kb)", size >> 10);
125 s = format (s, "(%d bytes)", size);
130 u8 * format_svm_region (u8 * s, va_list * args)
132 svm_region_t *rp = va_arg (*args, svm_region_t *);
133 int verbose = va_arg (*args, int);
137 s = format (s, "%s: base va 0x%x size 0x%x %U\n",
138 rp->region_name, rp->virtual_base,
139 rp->virtual_size, format_svm_size, rp->virtual_size);
140 s = format (s, " user_ctx 0x%x, bitmap_size %d\n",
141 rp->user_ctx, rp->bitmap_size);
144 s = format (s, " flags: 0x%x %U\n", rp->flags,
145 format_svm_flags, rp->flags);
147 " region_heap 0x%x data_base 0x%x data_heap 0x%x\n",
148 rp->region_heap, rp->data_base, rp->data_heap);
151 s = format (s, " %d clients, pids: ",
152 vec_len(rp->client_pids));
154 for (i = 0; i < vec_len(rp->client_pids); i++)
155 s = format (s, "%d ", rp->client_pids[i]);
157 s = format (s, "\n");
162 s = format (s, " VM in use: ");
164 for (i = 0; i < rp->bitmap_size; i++) {
165 if (clib_bitmap_get_no_check (rp->bitmap, i) != 0) {
167 hi = lo = rp->virtual_base + i*MMAP_PAGESIZE;
169 hi = rp->virtual_base + i*MMAP_PAGESIZE;
173 hi = rp->virtual_base + i*MMAP_PAGESIZE -1;
174 s = format (s, " 0x%x - 0x%x (%dk)\n", lo, hi,
180 s = format (s, " rgn heap stats: %U", format_mheap,
182 if ((rp->flags & SVM_FLAGS_MHEAP) && rp->data_heap) {
183 s = format (s, "\n data heap stats: %U", format_mheap,
186 s = format (s, "\n");
194 * Round to a pagesize multiple, presumably 4k works
196 static unsigned int rnd_pagesize(unsigned int size)
200 rv = (size + (MMAP_PAGESIZE-1)) & ~(MMAP_PAGESIZE-1);
205 * svm_data_region_setup
207 static int svm_data_region_create (svm_map_region_args_t *a,
214 map_size = rp->virtual_size - (MMAP_PAGESIZE + SVM_PVT_MHEAP_SIZE);
216 if (a->flags & SVM_FLAGS_FILE) {
219 fd = open (a->backing_file, O_RDWR | O_CREAT, 0777);
222 clib_unix_warning ("open");
226 if (fstat(fd, &statb) < 0) {
227 clib_unix_warning("fstat");
231 if (statb.st_mode & S_IFREG) {
232 if (statb.st_size == 0) {
233 lseek(fd, map_size, SEEK_SET);
234 if (write(fd, &junk, 1) != 1)
235 clib_unix_warning ("set region size");
237 map_size = rnd_pagesize (statb.st_size);
240 map_size = a->backing_mmap_size;
243 ASSERT(map_size <= rp->virtual_size -
244 (MMAP_PAGESIZE + SVM_PVT_MHEAP_SIZE));
246 if (mmap (rp->data_base, map_size, PROT_READ | PROT_WRITE,
247 MAP_SHARED | MAP_FIXED, fd, 0) == MAP_FAILED) {
248 clib_unix_warning("mmap");
252 rp->backing_file = (char *) format(0, "%s\0", a->backing_file);
253 rp->flags |= SVM_FLAGS_FILE;
256 if (a->flags & SVM_FLAGS_MHEAP) {
258 mheap_alloc_with_flags ((void *)(rp->data_base), map_size,
259 MHEAP_FLAG_DISABLE_VM);
260 rp->flags |= SVM_FLAGS_MHEAP;
265 static int svm_data_region_map (svm_map_region_args_t *a,
273 map_size = rp->virtual_size - (MMAP_PAGESIZE + SVM_PVT_MHEAP_SIZE);
275 if (a->flags & SVM_FLAGS_FILE) {
277 fd = open (a->backing_file, O_RDWR, 0777);
280 clib_unix_warning ("open");
284 if (fstat(fd, &statb) < 0) {
285 clib_unix_warning("fstat");
289 if (statb.st_mode & S_IFREG) {
290 if (statb.st_size == 0) {
291 lseek(fd, map_size, SEEK_SET);
292 if (write(fd, &junk, 1) != 1)
293 clib_unix_warning ("set region size");
295 map_size = rnd_pagesize (statb.st_size);
298 map_size = a->backing_mmap_size;
301 ASSERT(map_size <= rp->virtual_size
302 - (MMAP_PAGESIZE + SVM_PVT_MHEAP_SIZE));
304 if (mmap (rp->data_base, map_size, PROT_READ | PROT_WRITE,
305 MAP_SHARED | MAP_FIXED, fd, 0) == MAP_FAILED) {
306 clib_unix_warning("mmap");
314 u8 *shm_name_from_svm_map_region_args (svm_map_region_args_t *a)
320 int root_path_offset = 0;
324 /* Tolerate present or absent slashes */
325 if (a->root_path[0] == '/')
328 /* create the root_path under /dev/shm
329 iterate through path creating directories */
331 path = format (0, "/dev/shm/%s%c", &a->root_path[root_path_offset], 0);
332 split_point = path+1;
333 vec_add1(mkdir_arg, '-');
335 while (*split_point) {
336 while (*split_point && *split_point != '/') {
337 vec_add1 (mkdir_arg, *split_point);
340 vec_add1 (mkdir_arg, 0);
342 /* ready to descend another level */
343 mkdir_arg[vec_len(mkdir_arg)-1] = '-';
349 if (a->name[0] == '/')
352 shm_name = format (0, "/%s-%s%c", a->root_path,
353 &a->name[name_offset], 0);
356 shm_name = format (0, "%s%c", a->name, 0);
363 void *svm_map_region (svm_map_region_args_t *a)
367 pthread_mutexattr_t attr;
368 pthread_condattr_t cattr;
375 int nbits, words, bit;
376 int pid_holding_region_lock;
378 int dead_region_recovery = 0;
381 struct timespec ts, tsrem;
384 clib_warning ("[%d] map region %s", getpid(), a->name);
386 ASSERT((a->size & ~(MMAP_PAGESIZE-1)) == a->size);
389 shm_name = shm_name_from_svm_map_region_args (a);
391 svm_fd = shm_open((char *) shm_name, O_RDWR | O_CREAT | O_EXCL, 0777);
394 if (fchmod (svm_fd, 0770) < 0)
395 clib_unix_warning ("segment chmod");
396 /* This turns out to fail harmlessly if the client starts first */
397 if (fchown (svm_fd, a->uid, a->gid) < 0)
398 clib_unix_warning ("segment chown [ok if client starts first]");
402 lseek(svm_fd, a->size, SEEK_SET);
403 if (write(svm_fd, &junk, 1) != 1)
404 clib_warning ("set region size");
406 rp = mmap((void *)a->baseva, a->size,
407 PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, svm_fd, 0);
409 if (rp == (svm_region_t *) MAP_FAILED) {
410 clib_unix_warning ("mmap create");
414 memset(rp, 0, sizeof(*rp));
416 if (pthread_mutexattr_init(&attr))
417 clib_unix_warning("mutexattr_init");
419 if (pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED))
420 clib_unix_warning("mutexattr_setpshared");
422 if (pthread_mutex_init(&rp->mutex, &attr))
423 clib_unix_warning("mutex_init");
425 if (pthread_mutexattr_destroy(&attr))
426 clib_unix_warning("mutexattr_destroy");
428 if (pthread_condattr_init(&cattr))
429 clib_unix_warning("condattr_init");
431 if (pthread_condattr_setpshared(&cattr, PTHREAD_PROCESS_SHARED))
432 clib_unix_warning("condattr_setpshared");
434 if (pthread_cond_init(&rp->condvar, &cattr))
435 clib_unix_warning("cond_init");
437 if(pthread_condattr_destroy(&cattr))
438 clib_unix_warning("condattr_destroy");
442 rp->virtual_base = a->baseva;
443 rp->virtual_size = a->size;
446 mheap_alloc_with_flags ((void *)(a->baseva+MMAP_PAGESIZE),
448 MHEAP_FLAG_DISABLE_VM);
449 oldheap = svm_push_pvt_heap(rp);
451 rp->region_name = (char *)format (0, "%s%c", a->name, 0);
452 vec_add1(rp->client_pids, getpid());
454 nbits = rp->virtual_size / MMAP_PAGESIZE;
457 rp->bitmap_size = nbits;
458 words = (nbits + BITS(uword)-1) / BITS(uword);
459 vec_validate (rp->bitmap, words-1);
461 overhead_space = MMAP_PAGESIZE /* header */ +
465 data_base = (uword)rp->virtual_base;
467 if (a->flags & SVM_FLAGS_NODATA)
468 rp->flags |= SVM_FLAGS_NEED_DATA_INIT;
471 clib_bitmap_set_no_check (rp->bitmap, bit, 1);
473 overhead_space -= MMAP_PAGESIZE;
474 data_base += MMAP_PAGESIZE;
475 } while (overhead_space > 0);
477 rp->data_base = (void *)data_base;
480 * Note: although the POSIX spec guarantees that only one
481 * process enters this block, we have to play games
482 * to hold off clients until e.g. the mutex is ready
484 rp->version = SVM_VERSION;
486 /* setup the data portion of the region */
488 rv = svm_data_region_create (a, rp);
490 clib_warning ("data_region_create: %d", rv);
495 svm_pop_heap(oldheap);
497 return ((void *) rp);
499 svm_fd = shm_open((char *)shm_name, O_RDWR, 0777);
504 perror("svm_region_map(mmap open)");
510 if (0 != fstat(svm_fd, &stat)) {
511 clib_warning("fstat failed: %d", errno);
514 if (stat.st_size > 0) {
517 if (0 == time_left) {
518 clib_warning("waiting for resize of shm file timed out");
522 ts.tv_nsec = 100000000;
523 while (nanosleep(&ts, &tsrem) < 0)
528 rp = mmap(0, MMAP_PAGESIZE,
529 PROT_READ | PROT_WRITE, MAP_SHARED, svm_fd, 0);
531 if (rp == (svm_region_t *) MAP_FAILED) {
533 clib_warning("mmap");
537 * We lost the footrace to create this region; make sure
538 * the winner has crossed the finish line.
540 while (rp->version == 0 && deadman++ < 5) {
547 if (rp->version == 0) {
550 clib_warning("rp->version %d not %d", rp->version,
554 /* Remap now that the region has been placed */
555 a->baseva = rp->virtual_base;
556 a->size = rp->virtual_size;
557 munmap(rp, MMAP_PAGESIZE);
559 rp = (void *) mmap ((void *)a->baseva, a->size,
560 PROT_READ | PROT_WRITE,
561 MAP_SHARED | MAP_FIXED, svm_fd, 0);
562 if ((uword)rp == (uword)MAP_FAILED) {
563 clib_unix_warning ("mmap");
567 if ((uword) rp != rp->virtual_base) {
568 clib_warning("mmap botch");
572 * Try to fix the region mutex if it is held by
575 pid_holding_region_lock = rp->mutex_owner_pid;
576 if (pid_holding_region_lock &&
577 kill (pid_holding_region_lock, 0) < 0) {
579 "region %s mutex held by dead pid %d, tag %d, force unlock",
580 rp->region_name, pid_holding_region_lock, rp->mutex_owner_tag);
581 /* owner pid is nonexistent */
582 rp->mutex.__data.__owner = 0;
583 rp->mutex.__data.__lock = 0;
584 dead_region_recovery = 1;
587 if (dead_region_recovery)
588 clib_warning ("recovery: attempt to re-lock region");
591 oldheap = svm_push_pvt_heap (rp);
592 vec_add1(rp->client_pids, getpid());
594 if (dead_region_recovery)
595 clib_warning ("recovery: attempt svm_data_region_map");
597 rv = svm_data_region_map (a, rp);
599 clib_warning ("data_region_map: %d", rv);
602 if (dead_region_recovery)
603 clib_warning ("unlock and continue");
607 svm_pop_heap(oldheap);
609 return ((void *) rp);
612 return 0; /* NOTREACHED */
615 static void svm_mutex_cleanup (void)
618 for (i = 0; i < nheld; i++) {
619 pthread_mutex_unlock (mutexes_held[i]);
623 static void svm_region_init_internal (char *root_path, int uid, int gid)
626 svm_map_region_args_t _a, *a=&_a;
627 u64 ticks = clib_cpu_time_now();
628 uword randomize_baseva;
630 /* guard against klutz calls */
636 atexit(svm_mutex_cleanup);
638 /* Randomize the shared-VM base at init time */
639 if (MMAP_PAGESIZE <= (4<<10))
640 randomize_baseva = (ticks & 15) * MMAP_PAGESIZE;
642 randomize_baseva = (ticks & 3) * MMAP_PAGESIZE;
644 memset (a, 0, sizeof (*a));
645 a->root_path = root_path;
646 a->name = SVM_GLOBAL_REGION_NAME;
647 a->baseva = SVM_GLOBAL_REGION_BASEVA + randomize_baseva;
648 a->size = SVM_GLOBAL_REGION_SIZE;
649 a->flags = SVM_FLAGS_NODATA;
653 rp = svm_map_region (a);
658 /* Set up the main region data structures */
659 if (rp->flags & SVM_FLAGS_NEED_DATA_INIT) {
660 svm_main_region_t *mp = 0;
663 rp->flags &= ~(SVM_FLAGS_NEED_DATA_INIT);
665 oldheap = svm_push_pvt_heap (rp);
666 vec_validate (mp, 0);
667 mp->name_hash = hash_create_string (0, sizeof(uword));
668 mp->root_path = root_path
669 ? format (0, "%s%c", root_path, 0) : 0 ;
671 svm_pop_heap (oldheap);
677 void svm_region_init (void)
679 svm_region_init_internal (0, 0 /* uid */, 0 /* gid */);
682 void svm_region_init_chroot (char *root_path)
684 svm_region_init_internal (root_path, 0 /* uid */, 0 /* gid */);
687 void svm_region_init_chroot_uid_gid (char *root_path, int uid, int gid)
689 svm_region_init_internal (root_path, uid, gid);
692 void *svm_region_find_or_create (svm_map_region_args_t *a)
694 svm_main_region_t *mp;
701 svm_subregion_t *subp;
705 a->size += MMAP_PAGESIZE + SVM_PVT_MHEAP_SIZE;
706 a->size = rnd_pagesize(a->size);
708 region_lock (root_rp, 4);
709 oldheap = svm_push_pvt_heap(root_rp);
710 mp = root_rp->data_base;
714 /* Map the named region from the correct chroot environment */
715 a->root_path = (char *) mp->root_path;
718 * See if this region is already known. If it is, we're
721 p = hash_get_mem (mp->name_hash, a->name);
724 rp = svm_map_region (a);
725 region_unlock(root_rp);
726 svm_pop_heap (oldheap);
730 /* Create the region. */
731 ASSERT((a->size & ~(MMAP_PAGESIZE-1)) == a->size);
733 need_nbits = a->size / MMAP_PAGESIZE;
735 index = 1; /* $$$ fixme, figure out how many bit to really skip */
738 * Scan the virtual space allocation bitmap, looking for a large
742 if (clib_bitmap_get_no_check(root_rp->bitmap, index) == 0) {
743 for (i = 0; i < (need_nbits-1); i++) {
744 if (clib_bitmap_get_no_check(root_rp->bitmap,
754 } while (index < root_rp->bitmap_size);
756 /* Completely out of VM? */
757 if (index >= root_rp->bitmap_size) {
758 clib_warning("region %s: not enough VM to allocate 0x%x",
759 root_rp->region_name, a->size);
760 svm_pop_heap (oldheap);
761 region_unlock (root_rp);
766 * Mark virtual space allocated
769 clib_warning ("set %d bits at index %d", need_nbits, index);
772 for (i = 0; i < need_nbits; i++) {
773 clib_bitmap_set_no_check (root_rp->bitmap, index+i, 1);
776 /* Place this region where it goes... */
777 a->baseva = root_rp->virtual_base + index*MMAP_PAGESIZE;
779 rp = svm_map_region (a);
781 pool_get (mp->subregions, subp);
782 name = format (0, "%s%c", a->name, 0);
783 subp->subregion_name = name;
785 hash_set_mem (mp->name_hash, name, subp - mp->subregions);
787 svm_pop_heap (oldheap);
789 region_unlock (root_rp);
797 * Let go of the indicated region. If the calling process
798 * is the last customer, throw it away completely.
799 * The root region mutex guarantees atomicity with respect to
800 * a new region client showing up at the wrong moment.
802 void svm_region_unmap (void *rp_arg)
804 int i, mypid = getpid();
807 uword virtual_base, virtual_size;
808 svm_region_t *rp = rp_arg;
812 * If we take a signal while holding one or more shared-memory
813 * mutexes, we may end up back here from an otherwise
814 * benign exit handler. Bail out to avoid a recursive
824 clib_warning ("[%d] unmap region %s", getpid(), rp->region_name);
826 region_lock (root_rp, 5);
829 oldheap = svm_push_pvt_heap (rp); /* nb vec_delete() in the loop */
831 /* Remove the caller from the list of mappers */
832 for (i = 0; i < vec_len(rp->client_pids); i++) {
833 if (rp->client_pids[i] == mypid) {
834 vec_delete (rp->client_pids, 1, i);
838 clib_warning("pid %d AWOL", mypid);
842 svm_pop_heap (oldheap);
844 nclients_left = vec_len(rp->client_pids);
845 virtual_base = rp->virtual_base;
846 virtual_size = rp->virtual_size;
848 if (nclients_left == 0) {
850 svm_main_region_t *mp;
852 svm_subregion_t *subp;
854 /* Kill the region, last guy on his way out */
856 oldheap = svm_push_pvt_heap (root_rp);
857 name = vec_dup (rp->region_name);
859 virtual_base = rp->virtual_base;
860 virtual_size = rp->virtual_size;
862 /* Figure out which bits to clear in the root region bitmap */
863 index = (virtual_base - root_rp->virtual_base)
866 nbits = (virtual_size + MMAP_PAGESIZE - 1)
870 clib_warning ("clear %d bits at index %d", nbits, index);
872 /* Give back the allocated VM */
873 for (i = 0; i < nbits; i++) {
874 clib_bitmap_set_no_check (root_rp->bitmap, index+i, 0);
877 mp = root_rp->data_base;
879 p = hash_get_mem (mp->name_hash, name);
881 /* Better never happen ... */
884 region_unlock (root_rp);
885 svm_pop_heap (oldheap);
886 clib_warning ("Region name '%s' not found?", name);
890 /* Remove from the root region subregion pool */
891 subp = mp->subregions + p[0];
892 pool_put (mp->subregions, subp);
894 hash_unset_mem (mp->name_hash, name);
899 shm_unlink(rp->region_name);
900 munmap ((void *)virtual_base, virtual_size);
901 region_unlock (root_rp);
902 svm_pop_heap (oldheap);
907 region_unlock(root_rp);
909 munmap ((void *)virtual_base, virtual_size);
914 * There is no clean way to unlink the
915 * root region when all clients go away,
916 * so remove the pid entry and call it a day.
918 void svm_region_exit ()
921 int i, mypid = getpid();
922 uword virtual_base, virtual_size;
924 /* It felt so nice we did it twice... */
928 if (--root_rp_refcount > 0)
932 * If we take a signal while holding one or more shared-memory
933 * mutexes, we may end up back here from an otherwise
934 * benign exit handler. Bail out to avoid a recursive
940 region_lock(root_rp, 7);
941 oldheap = svm_push_pvt_heap (root_rp);
943 virtual_base = root_rp->virtual_base;
944 virtual_size = root_rp->virtual_size;
946 for (i = 0; i < vec_len(root_rp->client_pids); i++) {
947 if (root_rp->client_pids[i] == mypid) {
948 vec_delete (root_rp->client_pids, 1, i);
952 clib_warning("pid %d AWOL", mypid);
956 region_unlock(root_rp);
957 svm_pop_heap (oldheap);
960 munmap ((void *)virtual_base, virtual_size);
963 void svm_client_scan_this_region_nolock (svm_region_t *rp)
966 int mypid = getpid();
969 for (j = 0; j < vec_len(rp->client_pids); j++) {
970 if (mypid == rp->client_pids[j])
972 if (rp->client_pids[j] && (kill (rp->client_pids[j], 0) < 0)) {
973 clib_warning ("%s: cleanup ghost pid %d",
974 rp->region_name, rp->client_pids[j]);
975 /* nb: client vec in rp->region_heap */
976 oldheap = svm_push_pvt_heap (rp);
977 vec_delete (rp->client_pids, 1, j);
979 svm_pop_heap (oldheap);
986 * Scan svm regions for dead clients
988 void svm_client_scan(char *root_path)
991 svm_main_region_t *mp;
992 svm_map_region_args_t *a = 0;
993 svm_region_t *root_rp;
995 svm_subregion_t *subp;
999 int mypid = getpid();
1001 vec_validate (a, 0);
1003 svm_region_init_chroot(root_path);
1005 root_rp = svm_get_root_rp();
1007 pthread_mutex_lock (&root_rp->mutex);
1009 mp = root_rp->data_base;
1011 for (j = 0; j < vec_len (root_rp->client_pids); j++) {
1012 if (mypid == root_rp->client_pids[j])
1014 if (root_rp->client_pids[j]
1015 && (kill (root_rp->client_pids[j], 0) < 0)) {
1016 clib_warning ("%s: cleanup ghost pid %d",
1017 root_rp->region_name, root_rp->client_pids[j]);
1018 /* nb: client vec in root_rp->region_heap */
1019 oldheap = svm_push_pvt_heap (root_rp);
1020 vec_delete (root_rp->client_pids, 1, j);
1022 svm_pop_heap (oldheap);
1027 * Snapshoot names, can't hold root rp mutex across
1030 pool_foreach (subp, mp->subregions, ({
1031 name = vec_dup (subp->subregion_name);
1032 vec_add1(svm_names, name);
1035 pthread_mutex_unlock (&root_rp->mutex);
1037 for (i = 0; i < vec_len(svm_names); i++) {
1039 a->root_path = root_path;
1040 a->name = (char *) svm_names[i];
1041 rp = svm_region_find_or_create (a);
1043 pthread_mutex_lock (&rp->mutex);
1045 svm_client_scan_this_region_nolock (rp);
1047 pthread_mutex_unlock (&rp->mutex);
1048 svm_region_unmap (rp);
1049 vec_free(svm_names[i]);
1053 vec_free(svm_names);