2 * Copyright (c) 2016-2019 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <svm/fifo_segment.h>
18 static char *fifo_segment_mem_status_strings[] = {
19 #define _(sym,str) str,
20 foreach_segment_mem_status
25 * Fifo segment free space
27 * Queries the underlying memory manager, dlmalloc, for free space. Since this
28 * ends up walking the internal data structures, it should not be called
31 * @param fs fifo segment
32 * @return number of free bytes
35 fsh_free_space (fifo_segment_header_t * fsh)
37 struct dlmallinfo dlminfo;
39 dlminfo = mspace_mallinfo (fsh->ssvm_sh->heap);
40 return dlminfo.fordblks;
44 fsh_free_bytes_sub (fifo_segment_header_t * fsh, int size)
46 clib_atomic_fetch_sub_rel (&fsh->n_free_bytes, size);
50 fsh_n_free_bytes (fifo_segment_header_t * fsh)
52 uword n_free = clib_atomic_load_relax_n (&fsh->n_free_bytes);
53 return n_free > fsh->n_reserved_bytes ? n_free - fsh->n_reserved_bytes : 0;
57 fsh_update_free_bytes (fifo_segment_header_t * fsh)
59 clib_atomic_store_rel_n (&fsh->n_free_bytes, fsh_free_space (fsh));
63 fsh_cached_bytes_add (fifo_segment_header_t * fsh, int size)
65 clib_atomic_fetch_add_rel (&fsh->n_cached_bytes, size);
69 fsh_cached_bytes_sub (fifo_segment_header_t * fsh, int size)
71 clib_atomic_fetch_sub_rel (&fsh->n_cached_bytes, size);
75 fsh_n_cached_bytes (fifo_segment_header_t * fsh)
77 uword n_cached = clib_atomic_load_relax_n (&fsh->n_cached_bytes);
78 ASSERT (n_cached >= 0);
83 fsh_check_mem (fifo_segment_header_t * fsh)
87 if (fsh->flags & FIFO_SEGMENT_F_MEM_LIMIT)
90 thresh = clib_max (0.01 * fsh->ssvm_sh->ssvm_size,
91 2 * fsh->n_reserved_bytes);
92 if (fsh->n_free_bytes > thresh)
95 fsh->flags |= FIFO_SEGMENT_F_MEM_LIMIT;
96 fsh_update_free_bytes (fsh);
99 static inline fifo_segment_slice_t *
100 fsh_slice_get (fifo_segment_header_t * fsh, u32 slice_index)
102 return &fsh->slices[slice_index];
106 fsh_active_fifos_update (fifo_segment_header_t * fsh, int inc)
108 clib_atomic_fetch_add_rel (&fsh->n_active_fifos, inc);
112 * Initialize fifo segment shared header
115 fifo_segment_init (fifo_segment_t * fs)
117 fifo_segment_header_t *fsh;
118 fifo_segment_slice_t *fss;
119 ssvm_shared_header_t *sh;
120 u32 max_chunk_sz, max_chunks;
126 oldheap = ssvm_push_heap (sh);
129 * Manually align the fifo segment header to sizeof(uword) = 8 bytes.
130 * Long story made short: the "process-private" fifo segment
131 * is allocated from the main heap, not mmapped. dlmalloc
132 * only guarantees 4-byte alignment, and on aarch64
133 * the fsh can end up 4-byte but not 8-byte aligned.
134 * That eventually causes the atomic op in fifo_segment_update_free_bytes
137 fsh = clib_mem_alloc_aligned (sizeof (*fsh), sizeof (uword));
138 clib_memset (fsh, 0, sizeof (*fsh));
139 fs->h = sh->opaque[0] = fsh;
140 fs->n_slices = clib_max (fs->n_slices, 1);
142 fsh->ssvm_sh = fs->ssvm.sh;
143 fsh->n_slices = fs->n_slices;
144 max_fifo = clib_min ((fsh_free_space (fsh) - 4096) / 2,
145 FIFO_SEGMENT_MAX_FIFO_SIZE);
146 fsh->max_log2_chunk_size = max_log2 (max_fifo);
148 fsh->slices = clib_mem_alloc (sizeof (*fss) * fs->n_slices);
149 clib_memset (fsh->slices, 0, sizeof (*fss) * fs->n_slices);
150 max_chunk_sz = fsh->max_log2_chunk_size - FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE;
152 for (i = 0; i < fs->n_slices; i++)
154 fss = fsh_slice_get (fsh, i);
155 vec_validate_init_empty (fss->free_chunks, max_chunk_sz, 0);
156 clib_spinlock_init (&fss->chunk_lock);
159 ssvm_pop_heap (oldheap);
161 fsh->n_free_bytes = fsh_free_space (fsh);
162 fsh->n_cached_bytes = 0;
163 max_chunks = fsh->n_free_bytes / FIFO_SEGMENT_MIN_FIFO_SIZE;
164 fsh->n_reserved_bytes = (max_chunks / 4) * sizeof (rb_node_t);
170 * Create a fifo segment and initialize as master
173 fifo_segment_create (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
179 /* Allocate a fresh segment */
180 pool_get_zero (sm->segments, fs);
182 baseva = a->segment_type == SSVM_SEGMENT_PRIVATE ? ~0ULL : sm->next_baseva;
183 fs->ssvm.ssvm_size = a->segment_size;
184 fs->ssvm.i_am_master = 1;
185 fs->ssvm.my_pid = getpid ();
186 fs->ssvm.name = format (0, "%s%c", a->segment_name, 0);
187 fs->ssvm.requested_va = baseva;
189 if ((rv = ssvm_master_init (&fs->ssvm, a->segment_type)))
191 pool_put (sm->segments, fs);
195 /* Note: requested_va updated due to seg base addr randomization */
196 sm->next_baseva = fs->ssvm.sh->ssvm_va + fs->ssvm.ssvm_size;
198 fifo_segment_init (fs);
199 vec_add1 (a->new_segment_indices, fs - sm->segments);
204 * Attach as slave to a fifo segment
207 fifo_segment_attach (fifo_segment_main_t * sm, fifo_segment_create_args_t * a)
212 pool_get_zero (sm->segments, fs);
214 fs->ssvm.ssvm_size = a->segment_size;
215 fs->ssvm.my_pid = getpid ();
216 fs->ssvm.name = format (0, "%s%c", a->segment_name, 0);
217 fs->ssvm.requested_va = sm->next_baseva;
218 if (a->segment_type == SSVM_SEGMENT_MEMFD)
219 fs->ssvm.fd = a->memfd_fd;
221 fs->ssvm.attach_timeout = sm->timeout_in_seconds;
223 if ((rv = ssvm_slave_init (&fs->ssvm, a->segment_type)))
225 _vec_len (fs) = vec_len (fs) - 1;
229 /* Fish the segment header */
230 fs->h = fs->ssvm.sh->opaque[0];
232 vec_add1 (a->new_segment_indices, fs - sm->segments);
237 fifo_segment_delete (fifo_segment_main_t * sm, fifo_segment_t * s)
239 ssvm_delete (&s->ssvm);
240 clib_memset (s, 0xfe, sizeof (*s));
241 pool_put (sm->segments, s);
245 fifo_segment_index (fifo_segment_main_t * sm, fifo_segment_t * s)
247 return s - sm->segments;
251 fifo_segment_get_segment (fifo_segment_main_t * sm, u32 segment_index)
253 return pool_elt_at_index (sm->segments, segment_index);
257 fifo_segment_info (fifo_segment_t * seg, char **address, size_t * size)
259 *address = (char *) seg->ssvm.sh->ssvm_va;
260 *size = seg->ssvm.ssvm_size;
264 fifo_segment_main_init (fifo_segment_main_t * sm, u64 baseva,
265 u32 timeout_in_seconds)
267 sm->next_baseva = baseva;
268 sm->timeout_in_seconds = timeout_in_seconds;
272 fs_freelist_for_size (u32 size)
274 if (PREDICT_FALSE (size < FIFO_SEGMENT_MIN_FIFO_SIZE))
276 return max_log2 (size) - FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE;
280 fs_freelist_index_to_size (u32 fl_index)
282 return 1 << (fl_index + FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE);
286 fs_chunk_size_is_valid (fifo_segment_header_t * fsh, u32 size)
289 * 4K minimum. It's not likely that anything good will happen
290 * with a smaller FIFO.
292 return size >= FIFO_SEGMENT_MIN_FIFO_SIZE
293 && size <= (1 << fsh->max_log2_chunk_size);
297 fs_try_alloc_fifo_freelist (fifo_segment_slice_t * fss, u32 fl_index)
303 c = fss->free_chunks[fl_index];
308 fss->free_fifos = f->next;
309 fss->free_chunks[fl_index] = c->next;
312 memset (f, 0, sizeof (*f));
316 fss->n_fl_chunk_bytes -= fs_freelist_index_to_size (fl_index);
321 fs_try_alloc_fifo_freelist_multi_chunk (fifo_segment_header_t * fsh,
322 fifo_segment_slice_t * fss,
325 svm_fifo_chunk_t *c, *first = 0, *last = 0;
326 u32 fl_index, fl_size, n_alloc = 0;
332 void *oldheap = ssvm_push_heap (fsh->ssvm_sh);
333 f = clib_mem_alloc_aligned (sizeof (*f), CLIB_CACHE_LINE_BYTES);
334 ssvm_pop_heap (oldheap);
337 memset (f, 0, sizeof (*f));
338 fsh_free_bytes_sub (fsh, sizeof (*f));
342 fss->free_fifos = f->next;
345 fl_index = fs_freelist_for_size (data_bytes);
349 fl_size = fs_freelist_index_to_size (fl_index);
353 c = fss->free_chunks[fl_index];
356 fss->free_chunks[fl_index] = c->next;
362 data_bytes -= c->length;
366 /* Failed to allocate with smaller chunks */
369 /* free all chunks if any allocated */
373 fl_index = fs_freelist_for_size (c->length);
374 fl_size = fs_freelist_index_to_size (fl_index);
375 c->next = fss->free_chunks[fl_index];
376 fss->free_chunks[fl_index] = c;
377 fss->n_fl_chunk_bytes += fl_size;
379 data_bytes += fl_size;
382 fl_index = fs_freelist_for_size (data_bytes);
383 if (fss->free_chunks[fl_index + 1])
386 fl_size = fs_freelist_index_to_size (fl_index);
390 f->next = fss->free_fifos;
395 fl_size = fl_size >> 1;
399 f->start_chunk = first;
401 fss->n_fl_chunk_bytes -= n_alloc;
402 fsh_cached_bytes_sub (fsh, n_alloc);
407 fs_try_alloc_fifo_batch (fifo_segment_header_t * fsh,
408 fifo_segment_slice_t * fss,
409 u32 fl_index, u32 batch_size)
411 u32 hdrs, rounded_data_size;
419 rounded_data_size = fs_freelist_index_to_size (fl_index);
420 hdrs = sizeof (*f) + sizeof (*c);
421 size = (uword) (hdrs + rounded_data_size) * batch_size;
423 oldheap = ssvm_push_heap (fsh->ssvm_sh);
424 fmem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
425 0 /* align_offset */ ,
426 0 /* os_out_of_memory */ );
427 ssvm_pop_heap (oldheap);
433 /* Carve fifo + chunk space */
434 for (i = 0; i < batch_size; i++)
436 f = (svm_fifo_t *) fmem;
437 memset (f, 0, sizeof (*f));
438 f->next = fss->free_fifos;
440 c = (svm_fifo_chunk_t *) (fmem + sizeof (*f));
442 c->length = rounded_data_size;
443 c->enq_rb_index = RBTREE_TNIL_INDEX;
444 c->deq_rb_index = RBTREE_TNIL_INDEX;
445 c->next = fss->free_chunks[fl_index];
446 fss->free_chunks[fl_index] = c;
447 fmem += hdrs + rounded_data_size;
450 fss->n_fl_chunk_bytes += batch_size * rounded_data_size;
451 fsh_cached_bytes_add (fsh, batch_size * rounded_data_size);
452 fsh_free_bytes_sub (fsh, size);
458 * Try to allocate new fifo
460 * Tries the following steps in order:
461 * - grab fifo and chunk from freelists
462 * - batch fifo and chunk allocation
463 * - single fifo allocation
464 * - grab multiple fifo chunks from freelists
467 fs_try_alloc_fifo (fifo_segment_header_t * fsh, fifo_segment_slice_t * fss,
470 u32 fifo_sz, fl_index;
475 min_size = clib_max ((fsh->pct_first_alloc * data_bytes) / 100, 4096);
476 fl_index = fs_freelist_for_size (min_size);
477 fifo_sz = sizeof (svm_fifo_t) + sizeof (svm_fifo_chunk_t);
478 fifo_sz += 1 << max_log2 (min_size);
480 if (fss->free_fifos && fss->free_chunks[fl_index])
482 f = fs_try_alloc_fifo_freelist (fss, fl_index);
485 fsh_cached_bytes_sub (fsh, fs_freelist_index_to_size (fl_index));
491 n_free_bytes = fsh_n_free_bytes (fsh);
492 if (fifo_sz * FIFO_SEGMENT_ALLOC_BATCH_SIZE < n_free_bytes)
494 if (fs_try_alloc_fifo_batch (fsh, fss, fl_index,
495 FIFO_SEGMENT_ALLOC_BATCH_SIZE))
498 f = fs_try_alloc_fifo_freelist (fss, fl_index);
500 fsh_cached_bytes_sub (fsh, fs_freelist_index_to_size (fl_index));
503 if (fifo_sz <= n_free_bytes)
505 void *oldheap = ssvm_push_heap (fsh->ssvm_sh);
506 f = svm_fifo_alloc (min_size);
507 ssvm_pop_heap (oldheap);
510 fsh_free_bytes_sub (fsh, fifo_sz);
514 if (data_bytes <= fss->n_fl_chunk_bytes)
515 f = fs_try_alloc_fifo_freelist_multi_chunk (fsh, fss, data_bytes);
525 fsh_alloc_chunk (fifo_segment_header_t * fsh, u32 slice_index, u32 chunk_size)
527 fifo_segment_slice_t *fss;
532 fl_index = fs_freelist_for_size (chunk_size);
533 fss = fsh_slice_get (fsh, slice_index);
535 clib_spinlock_lock (&fss->chunk_lock);
536 c = fss->free_chunks[fl_index];
541 chunk_size = fs_freelist_index_to_size (fl_index);
542 if (fsh_n_free_bytes (fsh) < chunk_size)
545 oldheap = ssvm_push_heap (fsh->ssvm_sh);
546 c = svm_fifo_chunk_alloc (chunk_size);
547 ssvm_pop_heap (oldheap);
552 fsh_free_bytes_sub (fsh, chunk_size + sizeof (*c));
556 fss->free_chunks[fl_index] = c->next;
558 fss->n_fl_chunk_bytes -= fs_freelist_index_to_size (fl_index);
559 fsh_cached_bytes_sub (fsh, fs_freelist_index_to_size (fl_index));
564 clib_spinlock_unlock (&fss->chunk_lock);
570 fsh_slice_collect_chunks (fifo_segment_header_t * fsh,
571 fifo_segment_slice_t * fss, svm_fifo_chunk_t * cur)
573 svm_fifo_chunk_t *next;
577 clib_spinlock_lock (&fss->chunk_lock);
582 fl_index = fs_freelist_for_size (cur->length);
583 cur->next = fss->free_chunks[fl_index];
584 cur->enq_rb_index = RBTREE_TNIL_INDEX;
585 cur->deq_rb_index = RBTREE_TNIL_INDEX;
586 fss->free_chunks[fl_index] = cur;
587 n_collect += fs_freelist_index_to_size (fl_index);
591 fss->n_fl_chunk_bytes += n_collect;
592 fsh_cached_bytes_add (fsh, n_collect);
594 clib_spinlock_unlock (&fss->chunk_lock);
598 fsh_collect_chunks (fifo_segment_header_t * fsh, u32 slice_index,
599 svm_fifo_chunk_t * cur)
601 fifo_segment_slice_t *fss;
602 fss = fsh_slice_get (fsh, slice_index);
603 fsh_slice_collect_chunks (fsh, fss, cur);
607 * Allocate fifo in fifo segment
610 fifo_segment_alloc_fifo_w_slice (fifo_segment_t * fs, u32 slice_index,
611 u32 data_bytes, fifo_segment_ftype_t ftype)
613 fifo_segment_header_t *fsh = fs->h;
614 fifo_segment_slice_t *fss;
617 ASSERT (slice_index < fs->n_slices);
619 fss = fsh_slice_get (fsh, slice_index);
620 f = fs_try_alloc_fifo (fsh, fss, data_bytes);
624 f->slice_index = slice_index;
626 svm_fifo_init (f, data_bytes);
628 /* If rx fifo type add to active fifos list. When cleaning up segment,
629 * we need a list of active sessions that should be disconnected. Since
630 * both rx and tx fifos keep pointers to the session, it's enough to track
632 if (ftype == FIFO_SEGMENT_RX_FIFO)
636 fss->fifos->prev = f;
637 f->next = fss->fifos;
640 f->flags |= SVM_FIFO_F_LL_TRACKED;
642 svm_fifo_init_ooo_lookup (f, 0 /* ooo enq */ );
646 svm_fifo_init_ooo_lookup (f, 1 /* ooo deq */ );
649 fsh_active_fifos_update (fsh, 1);
656 * Free fifo allocated in fifo segment
659 fifo_segment_free_fifo (fifo_segment_t * fs, svm_fifo_t * f)
661 fifo_segment_header_t *fsh = fs->h;
662 fifo_segment_slice_t *fss;
664 ASSERT (f->refcnt > 0);
669 fss = fsh_slice_get (fsh, f->slice_index);
671 /* Remove from active list. Only rx fifos are tracked */
672 if (f->flags & SVM_FIFO_F_LL_TRACKED)
675 f->prev->next = f->next;
677 fss->fifos = f->next;
679 f->next->prev = f->prev;
680 f->flags &= ~SVM_FIFO_F_LL_TRACKED;
683 /* Add to free list */
684 f->next = fss->free_fifos;
688 /* Free fifo chunks */
689 fsh_slice_collect_chunks (fsh, fss, f->start_chunk);
691 f->start_chunk = f->end_chunk = 0;
692 f->head_chunk = f->tail_chunk = f->ooo_enq = f->ooo_deq = 0;
694 /* not allocated on segment heap */
695 svm_fifo_free_chunk_lookup (f);
696 svm_fifo_free_ooo_data (f);
700 f->master_session_index = ~0;
701 f->master_thread_index = ~0;
704 fsh_active_fifos_update (fsh, -1);
708 fifo_segment_prealloc_fifo_hdrs (fifo_segment_t * fs, u32 slice_index,
711 fifo_segment_header_t *fsh = fs->h;
712 fifo_segment_slice_t *fss;
719 fss = fsh_slice_get (fsh, slice_index);
720 size = (uword) (sizeof (*f)) * batch_size;
722 oldheap = ssvm_push_heap (fsh->ssvm_sh);
723 fmem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
724 0 /* align_offset */ ,
725 0 /* os_out_of_memory */ );
726 ssvm_pop_heap (oldheap);
732 /* Carve fifo + chunk space */
733 for (i = 0; i < batch_size; i++)
735 f = (svm_fifo_t *) fmem;
736 memset (f, 0, sizeof (*f));
737 f->next = fss->free_fifos;
742 fsh_free_bytes_sub (fsh, size);
748 fifo_segment_prealloc_fifo_chunks (fifo_segment_t * fs, u32 slice_index,
749 u32 chunk_size, u32 batch_size)
751 fifo_segment_header_t *fsh = fs->h;
752 u32 rounded_data_size, fl_index;
753 fifo_segment_slice_t *fss;
760 if (!fs_chunk_size_is_valid (fsh, chunk_size))
762 clib_warning ("chunk size out of range %d", chunk_size);
766 fl_index = fs_freelist_for_size (chunk_size);
767 rounded_data_size = fs_freelist_index_to_size (fl_index);
768 size = (uword) (sizeof (*c) + rounded_data_size) * batch_size;
770 oldheap = ssvm_push_heap (fsh->ssvm_sh);
771 cmem = clib_mem_alloc_aligned_at_offset (size, CLIB_CACHE_LINE_BYTES,
772 0 /* align_offset */ ,
773 0 /* os_out_of_memory */ );
774 ssvm_pop_heap (oldheap);
780 fss = fsh_slice_get (fsh, slice_index);
782 /* Carve fifo + chunk space */
783 for (i = 0; i < batch_size; i++)
785 c = (svm_fifo_chunk_t *) cmem;
787 c->length = rounded_data_size;
788 c->next = fss->free_chunks[fl_index];
789 fss->free_chunks[fl_index] = c;
790 cmem += sizeof (*c) + rounded_data_size;
791 fsh_cached_bytes_add (fsh, rounded_data_size);
794 fss->n_fl_chunk_bytes += batch_size * rounded_data_size;
795 fsh_free_bytes_sub (fsh, size);
801 * Pre-allocates fifo pairs in fifo segment
804 fifo_segment_preallocate_fifo_pairs (fifo_segment_t * fs,
805 u32 rx_fifo_size, u32 tx_fifo_size,
808 u32 rx_rounded_data_size, tx_rounded_data_size, pair_size, pairs_to_alloc;
809 u32 hdrs, pairs_per_slice, alloc_now;
810 fifo_segment_header_t *fsh = fs->h;
811 int rx_fl_index, tx_fl_index, i;
812 fifo_segment_slice_t *fss;
813 uword space_available;
815 /* Parameter check */
816 if (rx_fifo_size == 0 || tx_fifo_size == 0 || *n_fifo_pairs == 0)
819 if (!fs_chunk_size_is_valid (fsh, rx_fifo_size))
821 clib_warning ("rx fifo_size out of range %d", rx_fifo_size);
825 if (!fs_chunk_size_is_valid (fsh, tx_fifo_size))
827 clib_warning ("tx fifo_size out of range %d", tx_fifo_size);
831 rx_rounded_data_size = (1 << (max_log2 (rx_fifo_size)));
832 rx_fl_index = fs_freelist_for_size (rx_fifo_size);
833 tx_rounded_data_size = (1 << (max_log2 (tx_fifo_size)));
834 tx_fl_index = fs_freelist_for_size (tx_fifo_size);
836 hdrs = sizeof (svm_fifo_t) + sizeof (svm_fifo_chunk_t);
838 /* Calculate space requirements */
839 pair_size = 2 * hdrs + rx_rounded_data_size + tx_rounded_data_size;
840 space_available = fsh_free_space (fsh);
841 pairs_to_alloc = space_available / pair_size;
842 pairs_to_alloc = clib_min (pairs_to_alloc, *n_fifo_pairs);
843 pairs_per_slice = pairs_to_alloc / fs->n_slices;
844 pairs_per_slice += pairs_to_alloc % fs->n_slices ? 1 : 0;
846 if (!pairs_per_slice)
849 for (i = 0; i < fs->n_slices; i++)
851 fss = fsh_slice_get (fsh, i);
852 alloc_now = clib_min (pairs_per_slice, *n_fifo_pairs);
853 if (fs_try_alloc_fifo_batch (fsh, fss, rx_fl_index, alloc_now))
854 clib_warning ("rx prealloc failed: pairs %u", alloc_now);
855 if (fs_try_alloc_fifo_batch (fsh, fss, tx_fl_index, alloc_now))
856 clib_warning ("tx prealloc failed: pairs %u", alloc_now);
858 /* Account for the pairs allocated */
859 *n_fifo_pairs -= alloc_now;
864 * Get number of active fifos
867 fifo_segment_num_fifos (fifo_segment_t * fs)
869 return clib_atomic_load_relax_n (&fs->h->n_active_fifos);
873 fs_slice_num_free_fifos (fifo_segment_slice_t * fss)
891 fifo_segment_num_free_fifos (fifo_segment_t * fs)
893 fifo_segment_header_t *fsh = fs->h;
894 fifo_segment_slice_t *fss;
898 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
900 fss = fsh_slice_get (fsh, slice_index);
901 count += fs_slice_num_free_fifos (fss);
907 fs_slice_num_free_chunks (fifo_segment_slice_t * fss, u32 size)
909 u32 count = 0, rounded_size, fl_index;
913 /* Count all free chunks? */
916 for (i = 0; i < vec_len (fss->free_chunks); i++)
918 c = fss->free_chunks[i];
931 rounded_size = (1 << (max_log2 (size)));
932 fl_index = fs_freelist_for_size (rounded_size);
934 if (fl_index >= vec_len (fss->free_chunks))
937 c = fss->free_chunks[fl_index];
950 fifo_segment_num_free_chunks (fifo_segment_t * fs, u32 size)
952 fifo_segment_header_t *fsh = fs->h;
953 fifo_segment_slice_t *fss;
957 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
959 fss = fsh_slice_get (fsh, slice_index);
960 count += fs_slice_num_free_chunks (fss, size);
966 fifo_segment_update_free_bytes (fifo_segment_t * fs)
968 fsh_update_free_bytes (fs->h);
972 fifo_segment_size (fifo_segment_t * fs)
974 return fs->ssvm.ssvm_size;
978 fsh_has_reached_mem_limit (fifo_segment_header_t * fsh)
980 return (fsh->flags & FIFO_SEGMENT_F_MEM_LIMIT) ? 1 : 0;
984 fsh_reset_mem_limit (fifo_segment_header_t * fsh)
986 fsh->flags &= ~FIFO_SEGMENT_F_MEM_LIMIT;
990 fifo_segment_free_bytes (fifo_segment_t * fs)
992 return fsh_n_free_bytes (fs->h);
996 fifo_segment_cached_bytes (fifo_segment_t * fs)
998 return fsh_n_cached_bytes (fs->h);
1002 fifo_segment_fl_chunk_bytes (fifo_segment_t * fs)
1004 fifo_segment_header_t *fsh = fs->h;
1005 fifo_segment_slice_t *fss;
1009 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1011 fss = fsh_slice_get (fsh, slice_index);
1012 n_bytes += fss->n_fl_chunk_bytes;
1019 fifo_segment_has_fifos (fifo_segment_t * fs)
1021 fifo_segment_header_t *fsh = fs->h;
1022 fifo_segment_slice_t *fss;
1025 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1027 fss = fsh_slice_get (fsh, slice_index);
1035 fifo_segment_get_slice_fifo_list (fifo_segment_t * fs, u32 slice_index)
1037 fifo_segment_header_t *fsh = fs->h;
1038 fifo_segment_slice_t *fss;
1040 fss = fsh_slice_get (fsh, slice_index);
1045 fifo_segment_get_mem_usage (fifo_segment_t * fs)
1049 size = fifo_segment_size (fs);
1051 size - fifo_segment_free_bytes (fs) - fifo_segment_cached_bytes (fs);
1052 return (in_use * 100) / size;
1055 fifo_segment_mem_status_t
1056 fifo_segment_determine_status (fifo_segment_header_t * fsh, u8 usage)
1058 if (!fsh->high_watermark || !fsh->low_watermark)
1059 return MEMORY_PRESSURE_NO_PRESSURE;
1061 /* once the no-memory is detected, the status continues
1062 * until memory usage gets below the high watermark
1064 if (fsh_has_reached_mem_limit (fsh))
1066 if (usage >= fsh->high_watermark)
1067 return MEMORY_PRESSURE_NO_MEMORY;
1069 fsh_reset_mem_limit (fsh);
1072 if (usage >= fsh->high_watermark)
1073 return MEMORY_PRESSURE_HIGH_PRESSURE;
1075 else if (usage >= fsh->low_watermark)
1076 return MEMORY_PRESSURE_LOW_PRESSURE;
1078 return MEMORY_PRESSURE_NO_PRESSURE;
1081 fifo_segment_mem_status_t
1082 fifo_segment_get_mem_status (fifo_segment_t * fs)
1084 fifo_segment_header_t *fsh = fs->h;
1085 u8 usage = fifo_segment_get_mem_usage (fs);
1087 return fifo_segment_determine_status (fsh, usage);
1091 format_fifo_segment_type (u8 * s, va_list * args)
1094 sp = va_arg (*args, fifo_segment_t *);
1095 ssvm_segment_type_t st = ssvm_type (&sp->ssvm);
1097 if (st == SSVM_SEGMENT_PRIVATE)
1098 s = format (s, "%s", "private-heap");
1099 else if (st == SSVM_SEGMENT_MEMFD)
1100 s = format (s, "%s", "memfd");
1101 else if (st == SSVM_SEGMENT_SHM)
1102 s = format (s, "%s", "shm");
1104 s = format (s, "%s", "unknown");
1109 * Segment format function
1112 format_fifo_segment (u8 * s, va_list * args)
1114 u32 count, indent, active_fifos, free_fifos, fifo_hdr = 0;
1115 fifo_segment_t *fs = va_arg (*args, fifo_segment_t *);
1116 int verbose __attribute__ ((unused)) = va_arg (*args, int);
1117 uword est_chunk_bytes, est_free_seg_bytes, free_chunks;
1118 uword chunk_bytes = 0, free_seg_bytes, chunk_size;
1119 uword tracked_cached_bytes;
1120 fifo_segment_header_t *fsh;
1121 fifo_segment_slice_t *fss;
1122 svm_fifo_chunk_t *c;
1127 uword allocated, in_use;
1129 fifo_segment_mem_status_t mem_st;
1131 indent = format_get_indent (s) + 2;
1135 s = format (s, "%-15s%15s%15s%15s%15s%15s", "Name", "Type",
1136 "HeapSize (M)", "ActiveFifos", "FreeFifos", "Address");
1140 fifo_segment_info (fs, &address, &size);
1141 active_fifos = fifo_segment_num_fifos (fs);
1142 free_fifos = fifo_segment_num_free_fifos (fs);
1144 s = format (s, "%-15v%15U%15llu%15u%15u%15llx", ssvm_name (&fs->ssvm),
1145 format_fifo_segment_type, fs, size >> 20ULL, active_fifos,
1146 free_fifos, address);
1153 free_chunks = fifo_segment_num_free_chunks (fs, ~0);
1155 s = format (s, "\n\n%UFree chunks by size:\n", format_white_space,
1158 s = format (s, "\n");
1160 for (slice_index = 0; slice_index < fs->n_slices; slice_index++)
1162 fss = fsh_slice_get (fsh, slice_index);
1163 for (i = 0; i < vec_len (fss->free_chunks); i++)
1165 c = fss->free_chunks[i];
1175 chunk_size = fs_freelist_index_to_size (i);
1176 s = format (s, "%U%-5u kB: %u\n", format_white_space, indent + 2,
1177 chunk_size >> 10, count);
1179 chunk_bytes += count * chunk_size;
1183 fifo_hdr = free_fifos * sizeof (svm_fifo_t);
1184 est_chunk_bytes = fifo_segment_fl_chunk_bytes (fs);
1185 est_free_seg_bytes = fifo_segment_free_bytes (fs);
1186 fifo_segment_update_free_bytes (fs);
1187 free_seg_bytes = fifo_segment_free_bytes (fs);
1188 tracked_cached_bytes = fifo_segment_cached_bytes (fs);
1189 allocated = fifo_segment_size (fs);
1190 in_use = fifo_segment_size (fs) - est_free_seg_bytes - tracked_cached_bytes;
1191 usage = (100.0 * in_use) / allocated;
1192 mem_st = fifo_segment_get_mem_status (fs);
1194 s = format (s, "\n%Useg free bytes: %U (%lu) estimated: %U (%lu)\n",
1195 format_white_space, indent + 2, format_memory_size,
1196 free_seg_bytes, free_seg_bytes, format_memory_size,
1197 est_free_seg_bytes, est_free_seg_bytes);
1200 "%Uchunk free bytes: %U (%lu) estimated: %U (%lu) tracked: %U (%lu)\n",
1201 format_white_space, indent + 2, format_memory_size, chunk_bytes,
1202 chunk_bytes, format_memory_size, est_chunk_bytes, est_chunk_bytes,
1203 format_memory_size, tracked_cached_bytes, tracked_cached_bytes);
1205 format (s, "%Ufifo hdr free bytes: %U (%u) reserved %U (%lu)\n",
1206 format_white_space, indent + 2, format_memory_size, fifo_hdr,
1207 fifo_hdr, format_memory_size, fsh->n_reserved_bytes,
1208 fsh->n_reserved_bytes);
1210 format (s, "%Usegment usage: %.2f%% (%U / %U) %s\n", format_white_space,
1211 indent + 2, usage, format_memory_size, in_use, format_memory_size,
1212 allocated, fifo_segment_mem_status_strings[mem_st]);
1213 s = format (s, "\n");
1219 * fd.io coding-style-patch-verification: ON
1222 * eval: (c-set-style "gnu")