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];
54 svm_get_root_rp (void)
62 svm_get_global_region_base_va ()
65 /* On AArch64 VA space can have different size, from 36 to 48 bits.
66 Here we are trying to detect VA bits by parsing /proc/self/maps
69 unformat_input_t input;
73 if ((fd = open ("/proc/self/maps", 0)) < 0)
74 clib_unix_error ("open '/proc/self/maps'");
76 unformat_init_clib_file (&input, fd);
77 while (unformat_check_input (&input) != UNFORMAT_END_OF_INPUT)
79 unformat (&input, "%llx-%llx", &start, &end);
80 unformat_skip_line (&input);
82 unformat_free (&input);
85 count_leading_zeros (bits, end);
86 bits = 64 - (bits + 1);
87 if (bits >= 36 && bits <= 48)
88 return ((1ul << bits) / 4) - (2 * SVM_GLOBAL_REGION_SIZE);
90 clib_unix_error ("unexpected va bits '%u'", bits);
98 region_lock (svm_region_t * rp, int tag)
100 pthread_mutex_lock (&rp->mutex);
102 rp->mutex_owner_pid = getpid ();
103 rp->mutex_owner_tag = tag;
105 ASSERT (nheld < MAXLOCK);
107 * Keep score of held mutexes so we can try to exit
108 * cleanly if the world comes to an end at the worst possible
111 mutexes_held[nheld++] = &rp->mutex;
115 region_unlock (svm_region_t * rp)
119 rp->mutex_owner_pid = 0;
120 rp->mutex_owner_tag = 0;
123 for (i = nheld - 1; i >= 0; i--)
125 if (mutexes_held[i] == &rp->mutex)
127 for (j = i; j < MAXLOCK - 1; j++)
128 mutexes_held[j] = mutexes_held[j + 1];
136 CLIB_MEMORY_BARRIER ();
137 pthread_mutex_unlock (&rp->mutex);
142 format_svm_flags (u8 * s, va_list * args)
144 uword f = va_arg (*args, uword);
146 if (f & SVM_FLAGS_MHEAP)
147 s = format (s, "MHEAP ");
148 if (f & SVM_FLAGS_FILE)
149 s = format (s, "FILE ");
150 if (f & SVM_FLAGS_NODATA)
151 s = format (s, "NODATA ");
152 if (f & SVM_FLAGS_NEED_DATA_INIT)
153 s = format (s, "INIT ");
159 format_svm_size (u8 * s, va_list * args)
161 uword size = va_arg (*args, uword);
163 if (size >= (1 << 20))
165 s = format (s, "(%d mb)", size >> 20);
167 else if (size >= (1 << 10))
169 s = format (s, "(%d kb)", size >> 10);
173 s = format (s, "(%d bytes)", size);
179 format_svm_region (u8 * s, va_list * args)
181 svm_region_t *rp = va_arg (*args, svm_region_t *);
182 int verbose = va_arg (*args, int);
186 s = format (s, "%s: base va 0x%x size 0x%x %U\n",
187 rp->region_name, rp->virtual_base,
188 rp->virtual_size, format_svm_size, rp->virtual_size);
189 s = format (s, " user_ctx 0x%x, bitmap_size %d\n",
190 rp->user_ctx, rp->bitmap_size);
194 s = format (s, " flags: 0x%x %U\n", rp->flags,
195 format_svm_flags, rp->flags);
197 " region_heap 0x%x data_base 0x%x data_heap 0x%x\n",
198 rp->region_heap, rp->data_base, rp->data_heap);
201 s = format (s, " %d clients, pids: ", vec_len (rp->client_pids));
203 for (i = 0; i < vec_len (rp->client_pids); i++)
204 s = format (s, "%d ", rp->client_pids[i]);
206 s = format (s, "\n");
212 s = format (s, " VM in use: ");
214 for (i = 0; i < rp->bitmap_size; i++)
216 if (clib_bitmap_get_no_check (rp->bitmap, i) != 0)
220 hi = lo = rp->virtual_base + i * MMAP_PAGESIZE;
224 hi = rp->virtual_base + i * MMAP_PAGESIZE;
231 hi = rp->virtual_base + i * MMAP_PAGESIZE - 1;
232 s = format (s, " 0x%x - 0x%x (%dk)\n", lo, hi,
238 s = format (s, " rgn heap stats: %U", format_mheap,
240 if ((rp->flags & SVM_FLAGS_MHEAP) && rp->data_heap)
242 s = format (s, "\n data heap stats: %U", format_mheap,
245 s = format (s, "\n");
253 * Round to a pagesize multiple, presumably 4k works
256 rnd_pagesize (u64 size)
260 rv = (size + (MMAP_PAGESIZE - 1)) & ~(MMAP_PAGESIZE - 1);
265 * svm_data_region_setup
268 svm_data_region_create (svm_map_region_args_t * a, svm_region_t * rp)
274 map_size = rp->virtual_size - (MMAP_PAGESIZE +
275 (a->pvt_heap_size ? a->pvt_heap_size :
276 SVM_PVT_MHEAP_SIZE));
278 if (a->flags & SVM_FLAGS_FILE)
282 fd = open (a->backing_file, O_RDWR | O_CREAT, 0777);
286 clib_unix_warning ("open");
290 if (fstat (fd, &statb) < 0)
292 clib_unix_warning ("fstat");
297 if (statb.st_mode & S_IFREG)
299 if (statb.st_size == 0)
301 if (lseek (fd, map_size, SEEK_SET) == (off_t) - 1)
303 clib_unix_warning ("seek region size");
307 if (write (fd, &junk, 1) != 1)
309 clib_unix_warning ("set region size");
316 map_size = rnd_pagesize (statb.st_size);
321 map_size = a->backing_mmap_size;
324 ASSERT (map_size <= rp->virtual_size -
325 (MMAP_PAGESIZE + SVM_PVT_MHEAP_SIZE));
327 if (mmap (rp->data_base, map_size, PROT_READ | PROT_WRITE,
328 MAP_SHARED | MAP_FIXED, fd, 0) == MAP_FAILED)
330 clib_unix_warning ("mmap");
335 rp->backing_file = (char *) format (0, "%s\0", a->backing_file);
336 rp->flags |= SVM_FLAGS_FILE;
339 if (a->flags & SVM_FLAGS_MHEAP)
342 mheap_alloc_with_flags ((void *) (rp->data_base), map_size,
343 MHEAP_FLAG_DISABLE_VM);
344 rp->flags |= SVM_FLAGS_MHEAP;
350 svm_data_region_map (svm_map_region_args_t * a, svm_region_t * rp)
357 map_size = rp->virtual_size -
359 + (a->pvt_heap_size ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE));
361 if (a->flags & SVM_FLAGS_FILE)
364 fd = open (a->backing_file, O_RDWR, 0777);
368 clib_unix_warning ("open");
372 if (fstat (fd, &statb) < 0)
374 clib_unix_warning ("fstat");
379 if (statb.st_mode & S_IFREG)
381 if (statb.st_size == 0)
383 if (lseek (fd, map_size, SEEK_SET) == (off_t) - 1)
385 clib_unix_warning ("seek region size");
389 if (write (fd, &junk, 1) != 1)
391 clib_unix_warning ("set region size");
398 map_size = rnd_pagesize (statb.st_size);
403 map_size = a->backing_mmap_size;
406 ASSERT (map_size <= rp->virtual_size
409 (a->pvt_heap_size ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE)));
411 if (mmap (rp->data_base, map_size, PROT_READ | PROT_WRITE,
412 MAP_SHARED | MAP_FIXED, fd, 0) == MAP_FAILED)
414 clib_unix_warning ("mmap");
424 shm_name_from_svm_map_region_args (svm_map_region_args_t * a)
430 int root_path_offset = 0;
435 /* Tolerate present or absent slashes */
436 if (a->root_path[0] == '/')
439 /* create the root_path under /dev/shm
440 iterate through path creating directories */
442 path = format (0, "/dev/shm/%s%c", &a->root_path[root_path_offset], 0);
443 split_point = path + 1;
444 vec_add1 (mkdir_arg, '-');
448 while (*split_point && *split_point != '/')
450 vec_add1 (mkdir_arg, *split_point);
453 vec_add1 (mkdir_arg, 0);
455 /* ready to descend another level */
456 mkdir_arg[vec_len (mkdir_arg) - 1] = '-';
459 vec_free (mkdir_arg);
462 if (a->name[0] == '/')
465 shm_name = format (0, "/%s-%s%c", &a->root_path[root_path_offset],
466 &a->name[name_offset], 0);
469 shm_name = format (0, "%s%c", a->name, 0);
474 svm_region_init_mapped_region (svm_map_region_args_t * a, svm_region_t * rp)
476 pthread_mutexattr_t attr;
477 pthread_condattr_t cattr;
478 int nbits, words, bit;
485 memset (rp, 0, sizeof (*rp));
487 if (pthread_mutexattr_init (&attr))
488 clib_unix_warning ("mutexattr_init");
490 if (pthread_mutexattr_setpshared (&attr, PTHREAD_PROCESS_SHARED))
491 clib_unix_warning ("mutexattr_setpshared");
493 if (pthread_mutex_init (&rp->mutex, &attr))
494 clib_unix_warning ("mutex_init");
496 if (pthread_mutexattr_destroy (&attr))
497 clib_unix_warning ("mutexattr_destroy");
499 if (pthread_condattr_init (&cattr))
500 clib_unix_warning ("condattr_init");
502 if (pthread_condattr_setpshared (&cattr, PTHREAD_PROCESS_SHARED))
503 clib_unix_warning ("condattr_setpshared");
505 if (pthread_cond_init (&rp->condvar, &cattr))
506 clib_unix_warning ("cond_init");
508 if (pthread_condattr_destroy (&cattr))
509 clib_unix_warning ("condattr_destroy");
513 rp->virtual_base = a->baseva;
514 rp->virtual_size = a->size;
517 mheap_alloc_with_flags (uword_to_pointer
518 (a->baseva + MMAP_PAGESIZE, void *),
520 0) ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE,
521 MHEAP_FLAG_DISABLE_VM);
522 oldheap = svm_push_pvt_heap (rp);
524 rp->region_name = (char *) format (0, "%s%c", a->name, 0);
525 vec_add1 (rp->client_pids, getpid ());
527 nbits = rp->virtual_size / MMAP_PAGESIZE;
530 rp->bitmap_size = nbits;
531 words = (nbits + BITS (uword) - 1) / BITS (uword);
532 vec_validate (rp->bitmap, words - 1);
534 overhead_space = MMAP_PAGESIZE /* header */ +
535 ((a->pvt_heap_size != 0) ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE);
538 data_base = (uword) rp->virtual_base;
540 if (a->flags & SVM_FLAGS_NODATA)
541 rp->flags |= SVM_FLAGS_NEED_DATA_INIT;
545 clib_bitmap_set_no_check (rp->bitmap, bit, 1);
547 overhead_space -= MMAP_PAGESIZE;
548 data_base += MMAP_PAGESIZE;
550 while (overhead_space > 0);
552 rp->data_base = (void *) data_base;
555 * Note: although the POSIX spec guarantees that only one
556 * process enters this block, we have to play games
557 * to hold off clients until e.g. the mutex is ready
559 rp->version = SVM_VERSION;
561 /* setup the data portion of the region */
563 rv = svm_data_region_create (a, rp);
566 clib_warning ("data_region_create: %d", rv);
571 svm_pop_heap (oldheap);
578 svm_map_region (svm_map_region_args_t * a)
586 int pid_holding_region_lock;
588 int dead_region_recovery = 0;
591 struct timespec ts, tsrem;
593 ASSERT ((a->size & ~(MMAP_PAGESIZE - 1)) == a->size);
596 shm_name = shm_name_from_svm_map_region_args (a);
599 clib_warning ("[%d] map region %s: shm_open (%s)",
600 getpid (), a->name, shm_name);
602 svm_fd = shm_open ((char *) shm_name, O_RDWR | O_CREAT | O_EXCL, 0777);
606 if (fchmod (svm_fd, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP) < 0)
607 clib_unix_warning ("segment chmod");
608 /* This turns out to fail harmlessly if the client starts first */
609 if (fchown (svm_fd, a->uid, a->gid) < 0)
610 clib_unix_warning ("segment chown [ok if client starts first]");
614 if (lseek (svm_fd, a->size, SEEK_SET) == (off_t) - 1)
616 clib_warning ("seek region size");
620 if (write (svm_fd, &junk, 1) != 1)
622 clib_warning ("set region size");
627 rp = mmap (uword_to_pointer (a->baseva, void *), a->size,
628 PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, svm_fd, 0);
630 if (rp == (svm_region_t *) MAP_FAILED)
632 clib_unix_warning ("mmap create");
638 svm_region_init_mapped_region (a, rp);
640 return ((void *) rp);
644 svm_fd = shm_open ((char *) shm_name, O_RDWR, 0777);
650 perror ("svm_region_map(mmap open)");
657 if (0 != fstat (svm_fd, &stat))
659 clib_warning ("fstat failed: %d", errno);
663 if (stat.st_size > 0)
669 clib_warning ("waiting for resize of shm file timed out");
674 ts.tv_nsec = 100000000;
675 while (nanosleep (&ts, &tsrem) < 0)
680 rp = mmap (0, MMAP_PAGESIZE,
681 PROT_READ | PROT_WRITE, MAP_SHARED, svm_fd, 0);
683 if (rp == (svm_region_t *) MAP_FAILED)
686 clib_warning ("mmap");
690 * We lost the footrace to create this region; make sure
691 * the winner has crossed the finish line.
693 while (rp->version == 0 && deadman++ < 5)
701 if (rp->version == 0)
703 clib_warning ("rp->version %d not %d", rp->version, SVM_VERSION);
705 munmap (rp, a->size);
708 /* Remap now that the region has been placed */
709 a->baseva = rp->virtual_base;
710 a->size = rp->virtual_size;
711 munmap (rp, MMAP_PAGESIZE);
713 rp = (void *) mmap (uword_to_pointer (a->baseva, void *), a->size,
714 PROT_READ | PROT_WRITE,
715 MAP_SHARED | MAP_FIXED, svm_fd, 0);
716 if ((uword) rp == (uword) MAP_FAILED)
718 clib_unix_warning ("mmap");
723 if ((uword) rp != rp->virtual_base)
725 clib_warning ("mmap botch");
729 * Try to fix the region mutex if it is held by
732 pid_holding_region_lock = rp->mutex_owner_pid;
733 if (pid_holding_region_lock && kill (pid_holding_region_lock, 0) < 0)
736 ("region %s mutex held by dead pid %d, tag %d, force unlock",
737 rp->region_name, pid_holding_region_lock, rp->mutex_owner_tag);
738 /* owner pid is nonexistent */
739 rp->mutex.__data.__owner = 0;
740 rp->mutex.__data.__lock = 0;
741 dead_region_recovery = 1;
744 if (dead_region_recovery)
745 clib_warning ("recovery: attempt to re-lock region");
748 oldheap = svm_push_pvt_heap (rp);
749 vec_add1 (rp->client_pids, getpid ());
751 if (dead_region_recovery)
752 clib_warning ("recovery: attempt svm_data_region_map");
754 rv = svm_data_region_map (a, rp);
757 clib_warning ("data_region_map: %d", rv);
760 if (dead_region_recovery)
761 clib_warning ("unlock and continue");
765 svm_pop_heap (oldheap);
767 return ((void *) rp);
770 return 0; /* NOTREACHED */
774 svm_mutex_cleanup (void)
777 for (i = 0; i < nheld; i++)
779 pthread_mutex_unlock (mutexes_held[i]);
784 svm_region_init_internal (svm_map_region_args_t * a)
787 u64 ticks = clib_cpu_time_now ();
788 uword randomize_baseva;
790 /* guard against klutz calls */
796 atexit (svm_mutex_cleanup);
798 /* Randomize the shared-VM base at init time */
799 if (MMAP_PAGESIZE <= (4 << 10))
800 randomize_baseva = (ticks & 15) * MMAP_PAGESIZE;
802 randomize_baseva = (ticks & 3) * MMAP_PAGESIZE;
804 a->baseva += randomize_baseva;
806 rp = svm_map_region (a);
812 /* Set up the main region data structures */
813 if (rp->flags & SVM_FLAGS_NEED_DATA_INIT)
815 svm_main_region_t *mp = 0;
818 rp->flags &= ~(SVM_FLAGS_NEED_DATA_INIT);
820 oldheap = svm_push_pvt_heap (rp);
821 vec_validate (mp, 0);
822 mp->name_hash = hash_create_string (0, sizeof (uword));
823 mp->root_path = a->root_path ? format (0, "%s%c", a->root_path, 0) : 0;
827 svm_pop_heap (oldheap);
836 svm_region_init (void)
838 svm_map_region_args_t _a, *a = &_a;
840 memset (a, 0, sizeof (*a));
842 a->name = SVM_GLOBAL_REGION_NAME;
843 a->baseva = svm_get_global_region_base_va ();
844 a->size = SVM_GLOBAL_REGION_SIZE;
845 a->flags = SVM_FLAGS_NODATA;
849 svm_region_init_internal (a);
853 svm_region_init_chroot (const char *root_path)
855 svm_map_region_args_t _a, *a = &_a;
857 memset (a, 0, sizeof (*a));
858 a->root_path = root_path;
859 a->name = SVM_GLOBAL_REGION_NAME;
860 a->baseva = svm_get_global_region_base_va ();
861 a->size = SVM_GLOBAL_REGION_SIZE;
862 a->flags = SVM_FLAGS_NODATA;
866 return svm_region_init_internal (a);
870 svm_region_init_chroot_uid_gid (const char *root_path, int uid, int gid)
872 svm_map_region_args_t _a, *a = &_a;
874 memset (a, 0, sizeof (*a));
875 a->root_path = root_path;
876 a->name = SVM_GLOBAL_REGION_NAME;
877 a->baseva = svm_get_global_region_base_va ();
878 a->size = SVM_GLOBAL_REGION_SIZE;
879 a->flags = SVM_FLAGS_NODATA;
883 svm_region_init_internal (a);
887 svm_region_init_args (svm_map_region_args_t * a)
889 svm_region_init_internal (a);
893 svm_region_find_or_create (svm_map_region_args_t * a)
895 svm_main_region_t *mp;
902 svm_subregion_t *subp;
906 a->size += MMAP_PAGESIZE +
907 ((a->pvt_heap_size != 0) ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE);
908 a->size = rnd_pagesize (a->size);
910 region_lock (root_rp, 4);
911 oldheap = svm_push_pvt_heap (root_rp);
912 mp = root_rp->data_base;
916 /* Map the named region from the correct chroot environment */
917 if (a->root_path == NULL)
918 a->root_path = (char *) mp->root_path;
921 * See if this region is already known. If it is, we're
924 p = hash_get_mem (mp->name_hash, a->name);
928 rp = svm_map_region (a);
929 region_unlock (root_rp);
930 svm_pop_heap (oldheap);
934 /* Create the region. */
935 ASSERT ((a->size & ~(MMAP_PAGESIZE - 1)) == a->size);
937 need_nbits = a->size / MMAP_PAGESIZE;
939 index = 1; /* $$$ fixme, figure out how many bit to really skip */
942 * Scan the virtual space allocation bitmap, looking for a large
947 if (clib_bitmap_get_no_check (root_rp->bitmap, index) == 0)
949 for (i = 0; i < (need_nbits - 1); i++)
951 if (clib_bitmap_get_no_check (root_rp->bitmap, index + i) == 1)
962 while (index < root_rp->bitmap_size);
964 /* Completely out of VM? */
965 if (index >= root_rp->bitmap_size)
967 clib_warning ("region %s: not enough VM to allocate 0x%llx (%lld)",
968 root_rp->region_name, a->size, a->size);
969 svm_pop_heap (oldheap);
970 region_unlock (root_rp);
975 * Mark virtual space allocated
978 clib_warning ("set %d bits at index %d", need_nbits, index);
981 for (i = 0; i < need_nbits; i++)
983 clib_bitmap_set_no_check (root_rp->bitmap, index + i, 1);
986 /* Place this region where it goes... */
987 a->baseva = root_rp->virtual_base + index * MMAP_PAGESIZE;
989 rp = svm_map_region (a);
991 pool_get (mp->subregions, subp);
992 name = format (0, "%s%c", a->name, 0);
993 subp->subregion_name = name;
995 hash_set_mem (mp->name_hash, name, subp - mp->subregions);
997 svm_pop_heap (oldheap);
999 region_unlock (root_rp);
1005 svm_region_unlink (svm_region_t * rp)
1007 svm_map_region_args_t _a, *a = &_a;
1008 svm_main_region_t *mp;
1013 ASSERT (vec_c_string_is_terminated (rp->region_name));
1015 mp = root_rp->data_base;
1018 a->root_path = (char *) mp->root_path;
1019 a->name = rp->region_name;
1020 shm_name = shm_name_from_svm_map_region_args (a);
1022 clib_warning ("[%d] shm_unlink (%s)", getpid (), shm_name);
1023 shm_unlink ((const char *) shm_name);
1024 vec_free (shm_name);
1030 * Let go of the indicated region. If the calling process
1031 * is the last customer, throw it away completely.
1032 * The root region mutex guarantees atomicity with respect to
1033 * a new region client showing up at the wrong moment.
1036 svm_region_unmap (void *rp_arg)
1038 int i, mypid = getpid ();
1041 uword virtual_base, virtual_size;
1042 svm_region_t *rp = rp_arg;
1046 * If we take a signal while holding one or more shared-memory
1047 * mutexes, we may end up back here from an otherwise
1048 * benign exit handler. Bail out to avoid a recursive
1058 clib_warning ("[%d] unmap region %s", getpid (), rp->region_name);
1060 region_lock (root_rp, 5);
1061 region_lock (rp, 6);
1063 oldheap = svm_push_pvt_heap (rp); /* nb vec_delete() in the loop */
1065 /* Remove the caller from the list of mappers */
1066 for (i = 0; i < vec_len (rp->client_pids); i++)
1068 if (rp->client_pids[i] == mypid)
1070 vec_delete (rp->client_pids, 1, i);
1074 clib_warning ("pid %d AWOL", mypid);
1078 svm_pop_heap (oldheap);
1080 nclients_left = vec_len (rp->client_pids);
1081 virtual_base = rp->virtual_base;
1082 virtual_size = rp->virtual_size;
1084 if (nclients_left == 0)
1086 int index, nbits, i;
1087 svm_main_region_t *mp;
1089 svm_subregion_t *subp;
1091 /* Kill the region, last guy on his way out */
1093 oldheap = svm_push_pvt_heap (root_rp);
1094 name = vec_dup (rp->region_name);
1096 virtual_base = rp->virtual_base;
1097 virtual_size = rp->virtual_size;
1099 /* Figure out which bits to clear in the root region bitmap */
1100 index = (virtual_base - root_rp->virtual_base) / MMAP_PAGESIZE;
1102 nbits = (virtual_size + MMAP_PAGESIZE - 1) / MMAP_PAGESIZE;
1105 clib_warning ("clear %d bits at index %d", nbits, index);
1107 /* Give back the allocated VM */
1108 for (i = 0; i < nbits; i++)
1110 clib_bitmap_set_no_check (root_rp->bitmap, index + i, 0);
1113 mp = root_rp->data_base;
1115 p = hash_get_mem (mp->name_hash, name);
1117 /* Better never happen ... */
1121 region_unlock (root_rp);
1122 svm_pop_heap (oldheap);
1123 clib_warning ("Region name '%s' not found?", name);
1127 /* Remove from the root region subregion pool */
1128 subp = mp->subregions + p[0];
1129 pool_put (mp->subregions, subp);
1131 hash_unset_mem (mp->name_hash, name);
1136 svm_region_unlink (rp);
1137 munmap ((void *) virtual_base, virtual_size);
1138 region_unlock (root_rp);
1139 svm_pop_heap (oldheap);
1144 region_unlock (root_rp);
1146 munmap ((void *) virtual_base, virtual_size);
1156 int i, mypid = getpid ();
1157 uword virtual_base, virtual_size;
1159 /* It felt so nice we did it twice... */
1163 if (--root_rp_refcount > 0)
1167 * If we take a signal while holding one or more shared-memory
1168 * mutexes, we may end up back here from an otherwise
1169 * benign exit handler. Bail out to avoid a recursive
1175 region_lock (root_rp, 7);
1176 oldheap = svm_push_pvt_heap (root_rp);
1178 virtual_base = root_rp->virtual_base;
1179 virtual_size = root_rp->virtual_size;
1181 for (i = 0; i < vec_len (root_rp->client_pids); i++)
1183 if (root_rp->client_pids[i] == mypid)
1185 vec_delete (root_rp->client_pids, 1, i);
1189 clib_warning ("pid %d AWOL", mypid);
1193 if (vec_len (root_rp->client_pids) == 0)
1194 svm_region_unlink (root_rp);
1196 region_unlock (root_rp);
1197 svm_pop_heap (oldheap);
1200 munmap ((void *) virtual_base, virtual_size);
1204 svm_client_scan_this_region_nolock (svm_region_t * rp)
1207 int mypid = getpid ();
1210 for (j = 0; j < vec_len (rp->client_pids); j++)
1212 if (mypid == rp->client_pids[j])
1214 if (rp->client_pids[j] && (kill (rp->client_pids[j], 0) < 0))
1216 clib_warning ("%s: cleanup ghost pid %d",
1217 rp->region_name, rp->client_pids[j]);
1218 /* nb: client vec in rp->region_heap */
1219 oldheap = svm_push_pvt_heap (rp);
1220 vec_delete (rp->client_pids, 1, j);
1222 svm_pop_heap (oldheap);
1229 * Scan svm regions for dead clients
1232 svm_client_scan (const char *root_path)
1235 svm_main_region_t *mp;
1236 svm_map_region_args_t *a = 0;
1237 svm_region_t *root_rp;
1239 svm_subregion_t *subp;
1243 int mypid = getpid ();
1245 vec_validate (a, 0);
1247 svm_region_init_chroot (root_path);
1249 root_rp = svm_get_root_rp ();
1251 pthread_mutex_lock (&root_rp->mutex);
1253 mp = root_rp->data_base;
1255 for (j = 0; j < vec_len (root_rp->client_pids); j++)
1257 if (mypid == root_rp->client_pids[j])
1259 if (root_rp->client_pids[j] && (kill (root_rp->client_pids[j], 0) < 0))
1261 clib_warning ("%s: cleanup ghost pid %d",
1262 root_rp->region_name, root_rp->client_pids[j]);
1263 /* nb: client vec in root_rp->region_heap */
1264 oldheap = svm_push_pvt_heap (root_rp);
1265 vec_delete (root_rp->client_pids, 1, j);
1267 svm_pop_heap (oldheap);
1272 * Snapshoot names, can't hold root rp mutex across
1276 pool_foreach (subp, mp->subregions, ({
1277 name = vec_dup (subp->subregion_name);
1278 vec_add1(svm_names, name);
1282 pthread_mutex_unlock (&root_rp->mutex);
1284 for (i = 0; i < vec_len (svm_names); i++)
1286 vec_validate (a, 0);
1287 a->root_path = root_path;
1288 a->name = (char *) svm_names[i];
1289 rp = svm_region_find_or_create (a);
1292 pthread_mutex_lock (&rp->mutex);
1294 svm_client_scan_this_region_nolock (rp);
1296 pthread_mutex_unlock (&rp->mutex);
1297 svm_region_unmap (rp);
1298 vec_free (svm_names[i]);
1302 vec_free (svm_names);
1310 * fd.io coding-style-patch-verification: ON
1313 * eval: (c-set-style "gnu")