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
|
// SPDX-License-Identifier: GPL-3.0-or-later
#include "july.h"
#define JULYL_MIN_ENTRIES 10
struct JulyL_item {
Word_t index;
void *value;
};
struct JulyL {
size_t entries;
size_t used;
// statistics
size_t bytes;
size_t bytes_moved;
size_t reallocs;
struct {
struct JulyL *prev;
struct JulyL *next;
} cache;
struct JulyL_item array[];
};
// ----------------------------------------------------------------------------
// JulyL cache
static struct {
struct {
SPINLOCK spinlock;
struct JulyL *available_items;
size_t available;
} protected;
struct {
size_t bytes;
size_t allocated;
size_t bytes_moved;
size_t reallocs;
} atomics;
} julyl_globals = {
.protected = {
.spinlock = NETDATA_SPINLOCK_INITIALIZER,
.available_items = NULL,
.available = 0,
},
.atomics = {
.bytes = 0,
.allocated = 0,
.bytes_moved = 0,
.reallocs = 0,
},
};
void julyl_cleanup1(void) {
struct JulyL *item = NULL;
if(!netdata_spinlock_trylock(&julyl_globals.protected.spinlock))
return;
if(julyl_globals.protected.available_items && julyl_globals.protected.available > 10) {
item = julyl_globals.protected.available_items;
DOUBLE_LINKED_LIST_REMOVE_ITEM_UNSAFE(julyl_globals.protected.available_items, item, cache.prev, cache.next);
julyl_globals.protected.available--;
}
netdata_spinlock_unlock(&julyl_globals.protected.spinlock);
if(item) {
size_t bytes = item->bytes;
freez(item);
__atomic_sub_fetch(&julyl_globals.atomics.bytes, bytes, __ATOMIC_RELAXED);
__atomic_sub_fetch(&julyl_globals.atomics.allocated, 1, __ATOMIC_RELAXED);
}
}
struct JulyL *julyl_get(void) {
struct JulyL *j;
netdata_spinlock_lock(&julyl_globals.protected.spinlock);
j = julyl_globals.protected.available_items;
if(likely(j)) {
DOUBLE_LINKED_LIST_REMOVE_ITEM_UNSAFE(julyl_globals.protected.available_items, j, cache.prev, cache.next);
julyl_globals.protected.available--;
}
netdata_spinlock_unlock(&julyl_globals.protected.spinlock);
if(unlikely(!j)) {
size_t bytes = sizeof(struct JulyL) + JULYL_MIN_ENTRIES * sizeof(struct JulyL_item);
j = mallocz(bytes);
j->bytes = bytes;
j->entries = JULYL_MIN_ENTRIES;
__atomic_add_fetch(&julyl_globals.atomics.bytes, bytes, __ATOMIC_RELAXED);
__atomic_add_fetch(&julyl_globals.atomics.allocated, 1, __ATOMIC_RELAXED);
}
j->used = 0;
j->bytes_moved = 0;
j->reallocs = 0;
j->cache.next = j->cache.prev = NULL;
return j;
}
static void julyl_release(struct JulyL *j) {
if(unlikely(!j)) return;
__atomic_add_fetch(&julyl_globals.atomics.bytes_moved, j->bytes_moved, __ATOMIC_RELAXED);
__atomic_add_fetch(&julyl_globals.atomics.reallocs, j->reallocs, __ATOMIC_RELAXED);
netdata_spinlock_lock(&julyl_globals.protected.spinlock);
DOUBLE_LINKED_LIST_APPEND_ITEM_UNSAFE(julyl_globals.protected.available_items, j, cache.prev, cache.next);
julyl_globals.protected.available++;
netdata_spinlock_unlock(&julyl_globals.protected.spinlock);
}
size_t julyl_cache_size(void) {
return __atomic_load_n(&julyl_globals.atomics.bytes, __ATOMIC_RELAXED);
}
size_t julyl_bytes_moved(void) {
return __atomic_load_n(&julyl_globals.atomics.bytes_moved, __ATOMIC_RELAXED);
}
// ----------------------------------------------------------------------------
// JulyL
size_t JulyLGet_binary_search_position_of_index(const struct JulyL *July, Word_t Index) {
// return the position of the first item >= Index
size_t left = 0;
size_t right = July->used;
while(left < right) {
size_t middle = (left + right) >> 1;
if(July->array[middle].index > Index)
right = middle;
else
left = middle + 1;
}
internal_fatal(left > July->used, "JULY: invalid position returned");
if(left > 0 && July->array[left - 1].index == Index)
return left - 1;
internal_fatal( (left < July->used && July->array[left].index < Index) ||
(left > 0 && July->array[left - 1].index >= Index)
, "JULY: wrong item returned");
return left;
}
PPvoid_t JulyLGet(Pcvoid_t PArray, Word_t Index, PJError_t PJError __maybe_unused) {
const struct JulyL *July = PArray;
if(!July)
return NULL;
size_t pos = JulyLGet_binary_search_position_of_index(July, Index);
if(unlikely(pos >= July->used || July->array[pos].index != Index))
return NULL;
return (PPvoid_t)&July->array[pos].value;
}
PPvoid_t JulyLIns(PPvoid_t PPArray, Word_t Index, PJError_t PJError __maybe_unused) {
struct JulyL *July = *PPArray;
if(unlikely(!July)) {
July = julyl_get();
July->used = 0;
*PPArray = July;
}
size_t pos = JulyLGet_binary_search_position_of_index(July, Index);
if((pos == July->used || July->array[pos].index != Index)) {
// we have to add this entry
if (unlikely(July->used == July->entries)) {
// we have to expand the array
size_t bytes = sizeof(struct JulyL) + July->entries * 2 * sizeof(struct JulyL_item);
__atomic_add_fetch(&julyl_globals.atomics.bytes, bytes - July->bytes, __ATOMIC_RELAXED);
July = reallocz(July, bytes);
July->bytes = bytes;
July->entries *= 2;
July->reallocs++;
*PPArray = July;
}
if (unlikely(pos != July->used)) {
// we have to shift some members to make room
size_t size = (July->
|