aboutsummaryrefslogtreecommitdiffstats
path: root/src/vppinfra/mem_dlmalloc.c
blob: 38226e26f8f190a732cac4a4e79496476d973e02 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
/*
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <vppinfra/format.h>
#include <vppinfra/dlmalloc.h>
#include <vppinfra/os.h>
#include <vppinfra/lock.h>
#include <vppinfra/hash.h>
#include <vppinfra/elf_clib.h>
#include <vppinfra/sanitizer.h>
#include <numaif.h>

void *clib_per_cpu_mheaps[CLIB_MAX_MHEAPS];
void *clib_per_numa_mheaps[CLIB_MAX_NUMAS];

typedef struct
{
  /* Address of callers: outer first, inner last. */
  uword callers[12];

  /* Count of allocations with this traceback. */
#if CLIB_VEC64 > 0
  u64 n_allocations;
#else
  u32 n_allocations;
#endif

  /* Count of bytes allocated with this traceback. */
  u32 n_bytes;

  /* Offset of this item */
  uword offset;
} mheap_trace_t;

typedef struct
{
  clib_spinlock_t lock;
  uword enabled;

  mheap_trace_t *traces;

  /* Indices of free traces. */
  u32 *trace_free_list;

  /* Hash table mapping callers to trace index. */
  uword *trace_by_callers;

  /* Hash table mapping mheap offset to trace index. */
  uword *trace_index_by_offset;

  /* So we can easily shut off current segment trace, if any */
  void *current_traced_mheap;

} mheap_trace_main_t;

mheap_trace_main_t mheap_trace_main;

void
mheap_get_trace (uword offset, uword size)
{
  mheap_trace_main_t *tm = &mheap_trace_main;
  mheap_trace_t *t;
  uword i, n_callers, trace_index, *p;
  mheap_trace_t trace;
  uword save_enabled;

  if (tm->enabled == 0 || (clib_mem_get_heap () != tm->current_traced_mheap))
    return;

  /* Spurious Coverity warnings be gone. */
  clib_memset (&trace, 0, sizeof (trace));

  /* Skip our frame and mspace_get_aligned's frame */
  n_callers = clib_backtrace (trace.callers, ARRAY_LEN (trace.callers), 2);
  if (n_callers == 0)
    return;

  clib_spinlock_lock (&tm->lock);

  /* Turn off tracing to avoid embarrassment... */
  save_enabled = tm->enabled;
  tm->enabled = 0;

  if (!tm->trace_by_callers)
    tm->trace_by_callers =
      hash_create_shmem (0, sizeof (trace.callers), sizeof (uword));

  p = hash_get_mem (tm->trace_by_callers, &trace.callers);
  if (p)
    {
      trace_index = p[0];
      t = tm->traces + trace_index;
    }
  else
    {
      i = vec_len (tm->trace_free_list);
      if (i > 0)
	{
	  trace_index = tm->trace_free_list[i - 1];
	  _vec_len (tm->trace_free_list) = i - 1;
	}
      else
	{
	  mheap_trace_t *old_start = tm->traces;
	  mheap_trace_t *old_end = vec_end (tm->traces);

	  vec_add2 (tm->traces, t, 1);

	  if (tm->traces != old_start)
	    {
	      hash_pair_t *p;
	      mheap_trace_t *q;
            /* *INDENT-OFF* */
	    hash_foreach_pair (p, tm->trace_by_callers,
            ({
              q = uword_to_pointer (p->key, mheap_trace_t *);
              ASSERT (q >= old_start && q < old_end);
	      p->key = pointer_to_uword (tm->traces + (q - old_start));
	    }));
            /* *INDENT-ON* */
	    }
	  trace_index = t - tm->traces;
	}

      t = tm->traces + trace_index;
      t[0] = trace;
      t->n_allocations = 0;
      t->n_bytes = 0;
      hash_set_mem (tm->trace_by_callers, t->callers, trace_index);
    }

  t->n_allocations += 1;
  t->n_bytes += size;
  t->offset = offset;		/* keep a sample to autopsy */
  hash_set (tm->trace_index_by_offset, offset, t - tm->traces);
  tm->enabled = save_enabled;
  clib_spinlock_unlock (&tm->lock);
}

void
mheap_put_trace (uword offset, uword size)
{
  mheap_trace_t *t;
  uword trace_index, *p;
  mheap_trace_main_t *tm = &mheap_trace_main;
  uword save_enabled;

  if (tm->enabled == 0)
    return;

  clib_spinlock_lock (&tm->lock);

  /* Turn off tracing for a moment */
  save_enabled = tm->enabled;
  tm->enabled = 0;

  p = hash_get (tm->trace_index_by_offset, offset);
  if (!p)
    {
      tm->enabled = save_enabled;
      clib_spinlock_unlock (&tm->lock);
      return;
    }

  trace_index = p[0];
  hash_unset (tm->trace_index_by_offset, offset);
  ASSERT (trace_index < vec_len (tm->traces));

  t = tm->traces + trace_index;
  ASSERT (t->n_allocations > 0);
  ASSERT (t->n_bytes >= size);
  t->n_allocations -= 1;
  t->n_bytes -= size;
  if (t->n_allocations == 0)
    {
      hash_unset_mem (tm->trace_by_callers, t->callers);
      vec_add1 (tm->trace_free_list, trace_index);
      clib_memset (t, 0, sizeof (t[0]));
    }
  tm->enabled = save_enabled;
  clib_spinlock_unlock (&tm->lock);
}

always_inline void
mheap_trace_main_free (mheap_trace_main_t * tm)
{
  vec_free (tm->traces);
  vec_free (tm->trace_free_list);
  hash_free (tm->trace_by_callers);
  hash_free (tm->trace_index_by_offset);
}

/* Initialize CLIB heap based on memory/size given by user.
   Set memory to 0 and CLIB will try to allocate its own heap. */
static void *
clib_mem_init_internal (void *memory, uword memory_size, int set_heap)
{
  u8 *heap;

  if (memory)
    {
      heap = create_mspace_with_base (memory, memory_size, 1 /* locked */ );
      mspace_disable_expand (heap);
    }
  else
    heap = create_mspace (memory_size, 1 /* locked */ );

  CLIB_MEM_POISON (mspace_least_addr (heap), mspace_footprint (heap));

  if (set_heap)
    clib_mem_set_heap (heap);

  if (mheap_trace_main.lock == 0)
    clib_spinlock_init (&mheap_trace_main.lock);

  return heap;
}

void *
clib_mem_init (void *memory, uword memory_size)
{
  return clib_mem_init_internal (memory, memory_size,
				 1 /* do clib_mem_set_heap */ );
}

void *
clib_mem_init_thread_safe (void *memory, uword memory_size)
{
  return clib_mem_init_internal (memory, memory_size,
				 1 /* do clib_mem_set_heap */ );
}

void *
clib_mem_init_thread_safe_numa (void *memory, uword memory_size)
{
  void *heap;
  unsigned long this_numa;

  heap =
    clib_mem_init_internal (memory, memory_size,
			    0 /* do NOT clib_mem_set_heap */ );

  ASSERT (heap);

  this_numa = os_get_numa_index ();

#if HAVE_NUMA_LIBRARY > 0
  unsigned long nodemask = 1 << this_numa;
  void *page_base;
  unsigned long page_mask;
  long rv;

  /*
   * Bind the heap to the current thread's NUMA node.
   * heap is not naturally page-aligned, so fix it.
   */

  page_mask = ~(clib_mem_get_page_size () - 1);
  page_base = (void *) (((unsigned long) heap) & page_mask);

  clib_warning ("Bind heap at %llx size %llx to NUMA numa %d",
		page_base, memory_size, this_numa);

  rv = mbind (page_base, memory_size, MPOL_BIND /* mode */ ,
	      &nodemask /* nodemask */ ,
	      BITS (nodemask) /* max node number */ ,
	      MPOL_MF_MOVE /* flags */ );

  if (rv < 0)
    clib_unix_warning ("mbind");
#else
  clib_warning ("mbind unavailable, can't bind to numa %d", this_numa);
#endif

  return heap;
}

u8 *
format_clib_mem_usage (u8 * s, va_list * va)
{
  int verbose = va_arg (*va, int);
  return format (s, "$$$$ heap at %llx verbose %d", clib_mem_get_heap (),
		 verbose);
}

/*
 * Magic decoder ring for mallinfo stats (ala dlmalloc):
 *
 * size_t arena;     / * Non-mmapped space allocated (bytes) * /
 * size_t ordblks;   / * Number of free chunks * /
 * size_t smblks;    / * Number of free fastbin blocks * /
 * size_t hblks;     / * Number of mmapped regions * /
 * size_t hblkhd;    / * Space allocated in mmapped regions (bytes) * /
 * size_t usmblks;   / * Maximum total allocated space (bytes) * /
 * size_t fsmblks;   / * Space in freed fastbin blocks (bytes) * /
 * size_t uordblks;  / * Total allocated space (bytes) * /
 * size_t fordblks;  / * Total free space (bytes) * /
 * size_t keepcost;  / * Top-most, releasable space (bytes) * /
 *
 */

u8 *
format_msize (u8 * s, va_list * va)
{
  uword a = va_arg (*va, uword);

  if (a >= 1ULL << 30)
    s = format (s, "%.2fG", (((f64) a) / ((f64) (1ULL << 30))));
  else if (a >= 1ULL << 20)
    s = format (s, "%.2fM", (((f64) a) / ((f64) (1ULL << 20))));
  else if (a >= 1ULL << 10)
    s = format (s, "%.2fK", (((f64) a) / ((f64) (1ULL << 10))));
  else
    s = format (s, "%lld", a);
  return s;
}

static int
mheap_trace_sort (const void *_t1, const void *_t2)
{
  const mheap_trace_t *t1 = _t1;
  const mheap_trace_t *t2 = _t2;
  word cmp;

  cmp = (word) t2->n_bytes - (word) t1->n_bytes;
  if (!cmp)
    cmp = (word) t2->n_allocations - (word) t1->n_allocations;
  return cmp;
}

u8 *
format_mheap_trace (u8 * s, va_list * va)
{
  mheap_trace_main_t *tm = va_arg (*va, mheap_trace_main_t *);
  int verbose = va_arg (*va, int);
  int have_traces = 0;
  int i;

  clib_spinlock_lock (&tm->lock);
  if (vec_len (tm->traces) > 0 &&
      clib_mem_get_heap () == tm->current_traced_mheap)
    {
      have_traces = 1;

      /* Make a copy of traces since we'll be sorting them. */
      mheap_trace_t *t, *traces_copy;
      u32 indent, total_objects_traced;

      traces_copy = vec_dup (tm->traces);

      qsort (traces_copy, vec_len (traces_copy), sizeof (traces_copy[0]),
	     mheap_trace_sort);

      total_objects_traced = 0;
      s = format (s, "\n");
      vec_foreach (t, traces_copy)
      {
	/* Skip over free elements. */
	if (t->n_allocations == 0)
	  continue;

	total_objects_traced += t->n_allocations;

	/* When not verbose only report allocations of more than 1k. */
	if (!verbose && t->n_bytes < 1024)
	  continue;

	if (t == traces_copy)
	  s = format (s, "%=9s%=9s %=10s Traceback\n", "Bytes", "Count",
		      "Sample");
	s = format (s, "%9d%9d %p", t->n_bytes, t->n_allocations, t->offset);
	indent = format_get_indent (s);
	for (i = 0; i < ARRAY_LEN (t->callers) && t->callers[i]; i++)
	  {
	    if (i > 0)
	      s = format (s, "%U", format_white_space, indent);
#if defined(CLIB_UNIX) && !defined(__APPLE__)
	    /* $$$$ does this actually work? */
	    s =
	      format (s, " %U\n", format_clib_elf_symbol_with_address,
		      t->callers[i]);
#else
	    s = format (s, " %p\n", t->callers[i]);
#endif
	  }
      }

      s = format (s, "%d total traced objects\n", total_objects_traced);

      vec_free (traces_copy);
    }
  clib_spinlock_unlock (&tm->lock);
  if (have_traces == 0)
    s = format (s, "no traced allocations\n");

  return s;
}


u8 *
format_mheap (u8 * s, va_list * va)
{
  void *heap = va_arg (*va, u8 *);
  int verbose = va_arg (*va, int);
  struct dlmallinfo mi;
  mheap_trace_main_t *tm = &mheap_trace_main;

  mi = mspace_mallinfo (heap);

  s = format (s, "total: %U, used: %U, free: %U, trimmable: %U",
	      format_msize, mi.arena,
	      format_msize, mi.uordblks,
	      format_msize, mi.fordblks, format_msize, mi.keepcost);
  if (verbose > 0)
    {
      s = format (s, "\n    free chunks %llu free fastbin blks %llu",
		  mi.ordblks, mi.smblks);
      s =
	format (s, "\n    max total allocated %U", format_msize, mi.usmblks);
    }

  if (mspace_is_traced (heap))
    s = format (s, "\n%U", format_mheap_trace, tm, verbose);
  return s;
}

void
clib_mem_usage (clib_mem_usage_t * u)
{
  clib_warning ("unimp");
}

void
mheap_usage (void *heap, clib_mem_usage_t * usage)
{
  struct dlmallinfo mi = mspace_mallinfo (heap);

  /* TODO: Fill in some more values */
  usage->object_count = 0;
  usage->bytes_total = mi.arena;
  usage->bytes_overhead = 0;
  usage->bytes_max = 0;
  usage->bytes_used = mi.uordblks;
  usage->bytes_free = mi.fordblks;
  usage->bytes_free_reclaimed = 0;
}

/* Call serial number for debugger breakpoints. */
uword clib_mem_validate_serial = 0;

void
clib_mem_validate (void)
{
  clib_warning ("unimp");
}

void
mheap_trace (void *v, int enable)
{
  (void) mspace_enable_disable_trace (v, enable);

  if (enable == 0)
    mheap_trace_main_free (&mheap_trace_main);
}

void
clib_mem_trace (int enable)
{
  mheap_trace_main_t *tm = &mheap_trace_main;
  void *current_heap = clib_mem_get_heap ();

  tm->enabled = enable;
  mheap_trace (current_heap, enable);

  if (enable)
    tm->current_traced_mheap = current_heap;
  else
    tm->current_traced_mheap = 0;
}

int
clib_mem_is_traced (void)
{
  return mspace_is_traced (clib_mem_get_heap ());
}

uword
clib_mem_trace_enable_disable (uword enable)
{
  uword rv;
  mheap_trace_main_t *tm = &mheap_trace_main;

  rv = tm->enabled;
  tm->enabled = enable;
  return rv;
}

/*
 * These API functions seem like layering violations, but
 * by introducing them we greatly reduce the number
 * of code changes required to use dlmalloc spaces
 */
void *
mheap_alloc_with_lock (void *memory, uword size, int locked)
{
  void *rv;
  if (memory == 0)
    return create_mspace (size, locked);
  else
    {
      rv = create_mspace_with_base (memory, size, locked);
      if (rv)
	mspace_disable_expand (rv);
      return rv;
    }
}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */