1 What: /sys/kernel/slab
2 Date: May 2007
3 KernelVersion: 2.6.22
4 Contact: Pekka Enberg <penberg@cs.helsin
5 Christoph Lameter <cl@linux-fou
6 Description:
7 The /sys/kernel/slab directory
8 internal state of the SLUB all
9 files may be modified to chang
10 any cache it aliases, if any).
11 Users: kernel memory tuning tools
12
13 What: /sys/kernel/slab/<cache>/alias
14 Date: May 2007
15 KernelVersion: 2.6.22
16 Contact: Pekka Enberg <penberg@cs.helsin
17 Christoph Lameter <cl@linux-fou
18 Description:
19 The aliases file is read-only
20 have merged into this cache.
21
22 What: /sys/kernel/slab/<cache>/align
23 Date: May 2007
24 KernelVersion: 2.6.22
25 Contact: Pekka Enberg <penberg@cs.helsin
26 Christoph Lameter <cl@linux-fou
27 Description:
28 The align file is read-only an
29 alignment in bytes.
30
31 What: /sys/kernel/slab/<cache>/alloc
32 Date: May 2007
33 KernelVersion: 2.6.22
34 Contact: Pekka Enberg <penberg@cs.helsin
35 Christoph Lameter <cl@linux-fou
36 Description:
37 The alloc_calls file is read-o
38 locations from which allocatio
39 The alloc_calls file only cont
40 enabled for that cache (see Do
41
42 What: /sys/kernel/slab/<cache>/alloc
43 Date: February 2008
44 KernelVersion: 2.6.25
45 Contact: Pekka Enberg <penberg@cs.helsin
46 Christoph Lameter <cl@linux-fou
47 Description:
48 The alloc_fastpath file shows
49 allocated using the fast path.
50 current count.
51 Available when CONFIG_SLUB_STA
52
53 What: /sys/kernel/slab/<cache>/alloc
54 Date: February 2008
55 KernelVersion: 2.6.25
56 Contact: Pekka Enberg <penberg@cs.helsin
57 Christoph Lameter <cl@linux-fou
58 Description:
59 The alloc_from_partial file sh
60 been full and it has been refi
61 of partially used slabs. It c
62 count.
63 Available when CONFIG_SLUB_STA
64
65 What: /sys/kernel/slab/<cache>/alloc
66 Date: February 2008
67 KernelVersion: 2.6.25
68 Contact: Pekka Enberg <penberg@cs.helsin
69 Christoph Lameter <cl@linux-fou
70 Description:
71 The alloc_refill file shows ho
72 was empty but there were objec
73 remote cpu frees. It can be w
74 Available when CONFIG_SLUB_STA
75
76 What: /sys/kernel/slab/<cache>/alloc
77 Date: February 2008
78 KernelVersion: 2.6.25
79 Contact: Pekka Enberg <penberg@cs.helsin
80 Christoph Lameter <cl@linux-fou
81 Description:
82 The alloc_slab file is shows h
83 be allocated from the page all
84 clear the current count.
85 Available when CONFIG_SLUB_STA
86
87 What: /sys/kernel/slab/<cache>/alloc
88 Date: February 2008
89 KernelVersion: 2.6.25
90 Contact: Pekka Enberg <penberg@cs.helsin
91 Christoph Lameter <cl@linux-fou
92 Description:
93 The alloc_slowpath file shows
94 allocated using the slow path
95 allocation from a partial or n
96 clear the current count.
97 Available when CONFIG_SLUB_STA
98
99 What: /sys/kernel/slab/<cache>/cache
100 Date: May 2007
101 KernelVersion: 2.6.22
102 Contact: Pekka Enberg <penberg@cs.helsin
103 Christoph Lameter <cl@linux-fou
104 Description:
105 The cache_dma file is read-onl
106 are from ZONE_DMA.
107 Available when CONFIG_ZONE_DMA
108
109 What: /sys/kernel/slab/<cache>/cpu_s
110 Date: May 2007
111 KernelVersion: 2.6.22
112 Contact: Pekka Enberg <penberg@cs.helsin
113 Christoph Lameter <cl@linux-fou
114 Description:
115 The cpu_slabs file is read-onl
116 are active and their NUMA loca
117
118 What: /sys/kernel/slab/<cache>/cpusl
119 Date: April 2009
120 KernelVersion: 2.6.31
121 Contact: Pekka Enberg <penberg@cs.helsin
122 Christoph Lameter <cl@linux-fou
123 Description:
124 The file cpuslab_flush shows h
125 have been flushed as the resul
126 cache, a cpu going offline, or
127 allocation from a certain node
128 current count.
129 Available when CONFIG_SLUB_STA
130
131 What: /sys/kernel/slab/<cache>/ctor
132 Date: May 2007
133 KernelVersion: 2.6.22
134 Contact: Pekka Enberg <penberg@cs.helsin
135 Christoph Lameter <cl@linux-fou
136 Description:
137 The ctor file is read-only and
138 constructor function, which is
139 new slab is allocated.
140
141 What: /sys/kernel/slab/<cache>/deact
142 Date: February 2008
143 KernelVersion: 2.6.25
144 Contact: Pekka Enberg <penberg@cs.helsin
145 Christoph Lameter <cl@linux-fou
146 Description:
147 The deactivate_empty file show
148 was deactivated. It can be wr
149 Available when CONFIG_SLUB_STA
150
151 What: /sys/kernel/slab/<cache>/deact
152 Date: February 2008
153 KernelVersion: 2.6.25
154 Contact: Pekka Enberg <penberg@cs.helsin
155 Christoph Lameter <cl@linux-fou
156 Description:
157 The deactivate_full file shows
158 was deactivated. It can be wr
159 Available when CONFIG_SLUB_STA
160
161 What: /sys/kernel/slab/<cache>/deact
162 Date: February 2008
163 KernelVersion: 2.6.25
164 Contact: Pekka Enberg <penberg@cs.helsin
165 Christoph Lameter <cl@linux-fou
166 Description:
167 The deactivate_remote_frees fi
168 has been deactivated and conta
169 remotely. It can be written t
170 Available when CONFIG_SLUB_STA
171
172 What: /sys/kernel/slab/<cache>/deact
173 Date: February 2008
174 KernelVersion: 2.6.25
175 Contact: Pekka Enberg <penberg@cs.helsin
176 Christoph Lameter <cl@linux-fou
177 Description:
178 The deactivate_to_head file sh
179 slab was deactivated and added
180 list. It can be written to cl
181 Available when CONFIG_SLUB_STA
182
183 What: /sys/kernel/slab/<cache>/deact
184 Date: February 2008
185 KernelVersion: 2.6.25
186 Contact: Pekka Enberg <penberg@cs.helsin
187 Christoph Lameter <cl@linux-fou
188 Description:
189 The deactivate_to_tail file sh
190 slab was deactivated and added
191 list. It can be written to cl
192 Available when CONFIG_SLUB_STA
193
194 What: /sys/kernel/slab/<cache>/destr
195 Date: May 2007
196 KernelVersion: 2.6.22
197 Contact: Pekka Enberg <penberg@cs.helsin
198 Christoph Lameter <cl@linux-fou
199 Description:
200 The destroy_by_rcu file is rea
201 slabs (not objects) are freed
202
203 What: /sys/kernel/slab/<cache>/free_
204 Date: February 2008
205 KernelVersion: 2.6.25
206 Contact: Pekka Enberg <penberg@cs.helsin
207 Christoph Lameter <cl@linux-fou
208 Description:
209 The free_add_partial file show
210 been freed in a full slab so t
211 partial list. It can be writt
212 Available when CONFIG_SLUB_STA
213
214 What: /sys/kernel/slab/<cache>/free_
215 Date: May 2007
216 KernelVersion: 2.6.22
217 Contact: Pekka Enberg <penberg@cs.helsin
218 Christoph Lameter <cl@linux-fou
219 Description:
220 The free_calls file is read-on
221 object frees if slab debugging
222 Documentation/mm/slub.rst).
223
224 What: /sys/kernel/slab/<cache>/free_
225 Date: February 2008
226 KernelVersion: 2.6.25
227 Contact: Pekka Enberg <penberg@cs.helsin
228 Christoph Lameter <cl@linux-fou
229 Description:
230 The free_fastpath file shows h
231 using the fast path because it
232 It can be written to clear the
233 Available when CONFIG_SLUB_STA
234
235 What: /sys/kernel/slab/<cache>/free_
236 Date: February 2008
237 KernelVersion: 2.6.25
238 Contact: Pekka Enberg <penberg@cs.helsin
239 Christoph Lameter <cl@linux-fou
240 Description:
241 The free_frozen file shows how
242 a frozen slab (i.e. a remote c
243 clear the current count.
244 Available when CONFIG_SLUB_STA
245
246 What: /sys/kernel/slab/<cache>/free_
247 Date: February 2008
248 KernelVersion: 2.6.25
249 Contact: Pekka Enberg <penberg@cs.helsin
250 Christoph Lameter <cl@linux-fou
251 Description:
252 The free_remove_partial file s
253 been freed to a now-empty slab
254 its node's partial list. It c
255 count.
256 Available when CONFIG_SLUB_STA
257
258 What: /sys/kernel/slab/<cache>/free_
259 Date: February 2008
260 KernelVersion: 2.6.25
261 Contact: Pekka Enberg <penberg@cs.helsin
262 Christoph Lameter <cl@linux-fou
263 Description:
264 The free_slab file shows how m
265 freed back to the page allocat
266 the current count.
267 Available when CONFIG_SLUB_STA
268
269 What: /sys/kernel/slab/<cache>/free_
270 Date: February 2008
271 KernelVersion: 2.6.25
272 Contact: Pekka Enberg <penberg@cs.helsin
273 Christoph Lameter <cl@linux-fou
274 Description:
275 The free_slowpath file shows h
276 using the slow path (i.e. to a
277 be written to clear the curren
278 Available when CONFIG_SLUB_STA
279
280 What: /sys/kernel/slab/<cache>/hwcac
281 Date: May 2007
282 KernelVersion: 2.6.22
283 Contact: Pekka Enberg <penberg@cs.helsin
284 Christoph Lameter <cl@linux-fou
285 Description:
286 The hwcache_align file is read
287 objects are aligned on cacheli
288
289 What: /sys/kernel/slab/<cache>/min_p
290 Date: February 2009
291 KernelVersion: 2.6.30
292 Contact: Pekka Enberg <penberg@cs.helsin
293 David Rientjes <rientjes@google
294 Description:
295 The min_partial file specifies
296 remain on a node's partial lis
297 allocating new slabs. Such sl
298 the shrink file.
299
300 What: /sys/kernel/slab/<cache>/objec
301 Date: May 2007
302 KernelVersion: 2.6.22
303 Contact: Pekka Enberg <penberg@cs.helsin
304 Christoph Lameter <cl@linux-fou
305 Description:
306 The object_size file is read-o
307 object size.
308
309 What: /sys/kernel/slab/<cache>/objec
310 Date: May 2007
311 KernelVersion: 2.6.22
312 Contact: Pekka Enberg <penberg@cs.helsin
313 Christoph Lameter <cl@linux-fou
314 Description:
315 The objects file is read-only
316 active and from which nodes th
317
318 What: /sys/kernel/slab/<cache>/objec
319 Date: April 2008
320 KernelVersion: 2.6.26
321 Contact: Pekka Enberg <penberg@cs.helsin
322 Christoph Lameter <cl@linux-fou
323 Description:
324 The objects_partial file is re
325 objects are on partial slabs a
326 from.
327
328 What: /sys/kernel/slab/<cache>/objs_
329 Date: May 2007
330 KernelVersion: 2.6.22
331 Contact: Pekka Enberg <penberg@cs.helsin
332 Christoph Lameter <cl@linux-fou
333 Description:
334 The file objs_per_slab is read
335 objects may be allocated from
336 specified in /sys/kernel/slab/
337
338 What: /sys/kernel/slab/<cache>/order
339 Date: May 2007
340 KernelVersion: 2.6.22
341 Contact: Pekka Enberg <penberg@cs.helsin
342 Christoph Lameter <cl@linux-fou
343 Description:
344 The order file specifies the p
345 allocated. It is writable and
346 number of objects per slab. I
347 because of fragmentation, SLUB
348 possible depending on its char
349
350 When debug_guardpage_minorder=
351 (see Documentation/admin-guide
352 order is used and this sysfs e
353 the order at run time.
354
355 What: /sys/kernel/slab/<cache>/order
356 Date: April 2008
357 KernelVersion: 2.6.26
358 Contact: Pekka Enberg <penberg@cs.helsin
359 Christoph Lameter <cl@linux-fou
360 Description:
361 The order_fallback file shows
362 new slab has not been possible
363 fallen back to its minimum pos
364 clear the current count.
365
366 Available when CONFIG_SLUB_STA
367
368 What: /sys/kernel/slab/<cache>/parti
369 Date: May 2007
370 KernelVersion: 2.6.22
371 Contact: Pekka Enberg <penberg@cs.helsin
372 Christoph Lameter <cl@linux-fou
373 Description:
374 The partial file is read-only
375 partial slabs there are and ho
376
377 What: /sys/kernel/slab/<cache>/poiso
378 Date: May 2007
379 KernelVersion: 2.6.22
380 Contact: Pekka Enberg <penberg@cs.helsin
381 Christoph Lameter <cl@linux-fou
382 Description:
383 The poison file specifies whet
384 when a new slab is allocated.
385
386 What: /sys/kernel/slab/<cache>/recla
387 Date: May 2007
388 KernelVersion: 2.6.22
389 Contact: Pekka Enberg <penberg@cs.helsin
390 Christoph Lameter <cl@linux-fou
391 Description:
392 The reclaim_account file speci
393 are reclaimable (and grouped b
394
395 What: /sys/kernel/slab/<cache>/red_z
396 Date: May 2007
397 KernelVersion: 2.6.22
398 Contact: Pekka Enberg <penberg@cs.helsin
399 Christoph Lameter <cl@linux-fou
400 Description:
401 The red_zone file specifies wh
402 zoned.
403
404 What: /sys/kernel/slab/<cache>/remot
405 Date: January 2008
406 KernelVersion: 2.6.25
407 Contact: Pekka Enberg <penberg@cs.helsin
408 Christoph Lameter <cl@linux-fou
409 Description:
410 The file remote_node_defrag_ra
411 times SLUB will attempt to ref
412 slab from a remote node as opp
413 the local node. This reduces
414 the entire system but can be e
415
416 Available when CONFIG_NUMA is
417
418 What: /sys/kernel/slab/<cache>/sanit
419 Date: May 2007
420 KernelVersion: 2.6.22
421 Contact: Pekka Enberg <penberg@cs.helsin
422 Christoph Lameter <cl@linux-fou
423 Description:
424 The sanity_checks file specifi
425 should be performed on free an
426 checks. Caches that enable sa
427 caches that do not.
428
429 What: /sys/kernel/slab/<cache>/shrin
430 Date: May 2007
431 KernelVersion: 2.6.22
432 Contact: Pekka Enberg <penberg@cs.helsin
433 Christoph Lameter <cl@linux-fou
434 Description:
435 The shrink file is used to rec
436 memory from a cache. Empty pe
437 are freed and the partial list
438 with the fewest available obje
439 It only accepts a value of "1"
440 the cache. Other input values
441 Shrinking slab caches might be
442 adversely impact other running
443 should be used with care.
444
445 What: /sys/kernel/slab/<cache>/slab_
446 Date: May 2007
447 KernelVersion: 2.6.22
448 Contact: Pekka Enberg <penberg@cs.helsin
449 Christoph Lameter <cl@linux-fou
450 Description:
451 The slab_size file is read-onl
452 with metadata (debugging infor
453
454 What: /sys/kernel/slab/<cache>/slabs
455 Date: May 2007
456 KernelVersion: 2.6.22
457 Contact: Pekka Enberg <penberg@cs.helsin
458 Christoph Lameter <cl@linux-fou
459 Description:
460 The slabs file is read-only an
461 there are (both cpu and partia
462 from.
463
464 What: /sys/kernel/slab/<cache>/store
465 Date: May 2007
466 KernelVersion: 2.6.22
467 Contact: Pekka Enberg <penberg@cs.helsin
468 Christoph Lameter <cl@linux-fou
469 Description:
470 The store_user file specifies
471 allocation or free should be t
472
473 What: /sys/kernel/slab/<cache>/total
474 Date: April 2008
475 KernelVersion: 2.6.26
476 Contact: Pekka Enberg <penberg@cs.helsin
477 Christoph Lameter <cl@linux-fou
478 Description:
479 The total_objects file is read
480 objects a cache has and from w
481
482 What: /sys/kernel/slab/<cache>/trace
483 Date: May 2007
484 KernelVersion: 2.6.22
485 Contact: Pekka Enberg <penberg@cs.helsin
486 Christoph Lameter <cl@linux-fou
487 Description:
488 The trace file specifies wheth
489 should be traced.
490
491 What: /sys/kernel/slab/<cache>/valid
492 Date: May 2007
493 KernelVersion: 2.6.22
494 Contact: Pekka Enberg <penberg@cs.helsin
495 Christoph Lameter <cl@linux-fou
496 Description:
497 Writing to the validate file c
498 cache's objects and check the
499
500 What: /sys/kernel/slab/<cache>/users
501 Date: Jun 2017
502 Contact: David Windsor <dave@nullcore.ne
503 Description:
504 The usersize file is read-only
505 region size.
506
507 What: /sys/kernel/slab/<cache>/slabs
508 Date: Aug 2011
509 Contact: Christoph Lameter <cl@linux.com
510 Description:
511 This read-only file shows the
512 frozen slabs.
513
514 What: /sys/kernel/slab/<cache>/cpu_p
515 Date: Aug 2011
516 Contact: Christoph Lameter <cl@linux.com
517 Description:
518 This read-only file shows the
519 pages to keep around.
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