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Based on kernel version 3.16. Page generated on 2014-08-06 21:35 EST.

1	What:		/sys/kernel/slab
2	Date:		May 2007
3	KernelVersion:	2.6.22
4	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
5			Christoph Lameter <cl@linux-foundation.org>
6	Description:
7			The /sys/kernel/slab directory contains a snapshot of the
8			internal state of the SLUB allocator for each cache.  Certain
9			files may be modified to change the behavior of the cache (and
10			any cache it aliases, if any).
11	Users:		kernel memory tuning tools
12	
13	What:		/sys/kernel/slab/cache/aliases
14	Date:		May 2007
15	KernelVersion:	2.6.22
16	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
17			Christoph Lameter <cl@linux-foundation.org>
18	Description:
19			The aliases file is read-only and specifies how many caches
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.helsinki.fi>,
26			Christoph Lameter <cl@linux-foundation.org>
27	Description:
28			The align file is read-only and specifies the cache's object
29			alignment in bytes.
30	
31	What:		/sys/kernel/slab/cache/alloc_calls
32	Date:		May 2007
33	KernelVersion:	2.6.22
34	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
35			Christoph Lameter <cl@linux-foundation.org>
36	Description:
37			The alloc_calls file is read-only and lists the kernel code
38			locations from which allocations for this cache were performed.
39			The alloc_calls file only contains information if debugging is
40			enabled for that cache (see Documentation/vm/slub.txt).
41	
42	What:		/sys/kernel/slab/cache/alloc_fastpath
43	Date:		February 2008
44	KernelVersion:	2.6.25
45	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
46			Christoph Lameter <cl@linux-foundation.org>
47	Description:
48			The alloc_fastpath file shows how many objects have been
49			allocated using the fast path.  It can be written to clear the
50			current count.
51			Available when CONFIG_SLUB_STATS is enabled.
52	
53	What:		/sys/kernel/slab/cache/alloc_from_partial
54	Date:		February 2008
55	KernelVersion:	2.6.25
56	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
57			Christoph Lameter <cl@linux-foundation.org>
58	Description:
59			The alloc_from_partial file shows how many times a cpu slab has
60			been full and it has been refilled by using a slab from the list
61			of partially used slabs.  It can be written to clear the current
62			count.
63			Available when CONFIG_SLUB_STATS is enabled.
64	
65	What:		/sys/kernel/slab/cache/alloc_refill
66	Date:		February 2008
67	KernelVersion:	2.6.25
68	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
69			Christoph Lameter <cl@linux-foundation.org>
70	Description:
71			The alloc_refill file shows how many times the per-cpu freelist
72			was empty but there were objects available as the result of
73			remote cpu frees.  It can be written to clear the current count.
74			Available when CONFIG_SLUB_STATS is enabled.
75	
76	What:		/sys/kernel/slab/cache/alloc_slab
77	Date:		February 2008
78	KernelVersion:	2.6.25
79	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
80			Christoph Lameter <cl@linux-foundation.org>
81	Description:
82			The alloc_slab file is shows how many times a new slab had to
83			be allocated from the page allocator.  It can be written to
84			clear the current count.
85			Available when CONFIG_SLUB_STATS is enabled.
86	
87	What:		/sys/kernel/slab/cache/alloc_slowpath
88	Date:		February 2008
89	KernelVersion:	2.6.25
90	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
91			Christoph Lameter <cl@linux-foundation.org>
92	Description:
93			The alloc_slowpath file shows how many objects have been
94			allocated using the slow path because of a refill or
95			allocation from a partial or new slab.  It can be written to
96			clear the current count.
97			Available when CONFIG_SLUB_STATS is enabled.
98	
99	What:		/sys/kernel/slab/cache/cache_dma
100	Date:		May 2007
101	KernelVersion:	2.6.22
102	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
103			Christoph Lameter <cl@linux-foundation.org>
104	Description:
105			The cache_dma file is read-only and specifies whether objects
106			are from ZONE_DMA.
107			Available when CONFIG_ZONE_DMA is enabled.
108	
109	What:		/sys/kernel/slab/cache/cpu_slabs
110	Date:		May 2007
111	KernelVersion:	2.6.22
112	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
113			Christoph Lameter <cl@linux-foundation.org>
114	Description:
115			The cpu_slabs file is read-only and displays how many cpu slabs
116			are active and their NUMA locality.
117	
118	What:		/sys/kernel/slab/cache/cpuslab_flush
119	Date:		April 2009
120	KernelVersion:	2.6.31
121	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
122			Christoph Lameter <cl@linux-foundation.org>
123	Description:
124			The file cpuslab_flush shows how many times a cache's cpu slabs
125			have been flushed as the result of destroying or shrinking a
126			cache, a cpu going offline, or as the result of forcing an
127			allocation from a certain node.  It can be written to clear the
128			current count.
129			Available when CONFIG_SLUB_STATS is enabled.
130	
131	What:		/sys/kernel/slab/cache/ctor
132	Date:		May 2007
133	KernelVersion:	2.6.22
134	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
135			Christoph Lameter <cl@linux-foundation.org>
136	Description:
137			The ctor file is read-only and specifies the cache's object
138			constructor function, which is invoked for each object when a
139			new slab is allocated.
140	
141	What:		/sys/kernel/slab/cache/deactivate_empty
142	Date:		February 2008
143	KernelVersion:	2.6.25
144	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
145			Christoph Lameter <cl@linux-foundation.org>
146	Description:
147			The deactivate_empty file shows how many times an empty cpu slab
148			was deactivated.  It can be written to clear the current count.
149			Available when CONFIG_SLUB_STATS is enabled.
150	
151	What:		/sys/kernel/slab/cache/deactivate_full
152	Date:		February 2008
153	KernelVersion:	2.6.25
154	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
155			Christoph Lameter <cl@linux-foundation.org>
156	Description:
157			The deactivate_full file shows how many times a full cpu slab
158			was deactivated.  It can be written to clear the current count.
159			Available when CONFIG_SLUB_STATS is enabled.
160	
161	What:		/sys/kernel/slab/cache/deactivate_remote_frees
162	Date:		February 2008
163	KernelVersion:	2.6.25
164	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
165			Christoph Lameter <cl@linux-foundation.org>
166	Description:
167			The deactivate_remote_frees file shows how many times a cpu slab
168			has been deactivated and contained free objects that were freed
169			remotely.  It can be written to clear the current count.
170			Available when CONFIG_SLUB_STATS is enabled.
171	
172	What:		/sys/kernel/slab/cache/deactivate_to_head
173	Date:		February 2008
174	KernelVersion:	2.6.25
175	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
176			Christoph Lameter <cl@linux-foundation.org>
177	Description:
178			The deactivate_to_head file shows how many times a partial cpu
179			slab was deactivated and added to the head of its node's partial
180			list.  It can be written to clear the current count.
181			Available when CONFIG_SLUB_STATS is enabled.
182	
183	What:		/sys/kernel/slab/cache/deactivate_to_tail
184	Date:		February 2008
185	KernelVersion:	2.6.25
186	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
187			Christoph Lameter <cl@linux-foundation.org>
188	Description:
189			The deactivate_to_tail file shows how many times a partial cpu
190			slab was deactivated and added to the tail of its node's partial
191			list.  It can be written to clear the current count.
192			Available when CONFIG_SLUB_STATS is enabled.
193	
194	What:		/sys/kernel/slab/cache/destroy_by_rcu
195	Date:		May 2007
196	KernelVersion:	2.6.22
197	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
198			Christoph Lameter <cl@linux-foundation.org>
199	Description:
200			The destroy_by_rcu file is read-only and specifies whether
201			slabs (not objects) are freed by rcu.
202	
203	What:		/sys/kernel/slab/cache/free_add_partial
204	Date:		February 2008
205	KernelVersion:	2.6.25
206	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
207			Christoph Lameter <cl@linux-foundation.org>
208	Description:
209			The free_add_partial file shows how many times an object has
210			been freed in a full slab so that it had to added to its node's
211			partial list.  It can be written to clear the current count.
212			Available when CONFIG_SLUB_STATS is enabled.
213	
214	What:		/sys/kernel/slab/cache/free_calls
215	Date:		May 2007
216	KernelVersion:	2.6.22
217	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
218			Christoph Lameter <cl@linux-foundation.org>
219	Description:
220			The free_calls file is read-only and lists the locations of
221			object frees if slab debugging is enabled (see
222			Documentation/vm/slub.txt).
223	
224	What:		/sys/kernel/slab/cache/free_fastpath
225	Date:		February 2008
226	KernelVersion:	2.6.25
227	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
228			Christoph Lameter <cl@linux-foundation.org>
229	Description:
230			The free_fastpath file shows how many objects have been freed
231			using the fast path because it was an object from the cpu slab.
232			It can be written to clear the current count.
233			Available when CONFIG_SLUB_STATS is enabled.
234	
235	What:		/sys/kernel/slab/cache/free_frozen
236	Date:		February 2008
237	KernelVersion:	2.6.25
238	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
239			Christoph Lameter <cl@linux-foundation.org>
240	Description:
241			The free_frozen file shows how many objects have been freed to
242			a frozen slab (i.e. a remote cpu slab).  It can be written to
243			clear the current count.
244			Available when CONFIG_SLUB_STATS is enabled.
245	
246	What:		/sys/kernel/slab/cache/free_remove_partial
247	Date:		February 2008
248	KernelVersion:	2.6.25
249	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
250			Christoph Lameter <cl@linux-foundation.org>
251	Description:
252			The free_remove_partial file shows how many times an object has
253			been freed to a now-empty slab so that it had to be removed from
254			its node's partial list.  It can be written to clear the current
255			count.
256			Available when CONFIG_SLUB_STATS is enabled.
257	
258	What:		/sys/kernel/slab/cache/free_slab
259	Date:		February 2008
260	KernelVersion:	2.6.25
261	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
262			Christoph Lameter <cl@linux-foundation.org>
263	Description:
264			The free_slab file shows how many times an empty slab has been
265			freed back to the page allocator.  It can be written to clear
266			the current count.
267			Available when CONFIG_SLUB_STATS is enabled.
268	
269	What:		/sys/kernel/slab/cache/free_slowpath
270	Date:		February 2008
271	KernelVersion:	2.6.25
272	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
273			Christoph Lameter <cl@linux-foundation.org>
274	Description:
275			The free_slowpath file shows how many objects have been freed
276			using the slow path (i.e. to a full or partial slab).  It can
277			be written to clear the current count.
278			Available when CONFIG_SLUB_STATS is enabled.
279	
280	What:		/sys/kernel/slab/cache/hwcache_align
281	Date:		May 2007
282	KernelVersion:	2.6.22
283	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
284			Christoph Lameter <cl@linux-foundation.org>
285	Description:
286			The hwcache_align file is read-only and specifies whether
287			objects are aligned on cachelines.
288	
289	What:		/sys/kernel/slab/cache/min_partial
290	Date:		February 2009
291	KernelVersion:	2.6.30
292	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
293			David Rientjes <rientjes@google.com>
294	Description:
295			The min_partial file specifies how many empty slabs shall
296			remain on a node's partial list to avoid the overhead of
297			allocating new slabs.  Such slabs may be reclaimed by utilizing
298			the shrink file.
299	
300	What:		/sys/kernel/slab/cache/object_size
301	Date:		May 2007
302	KernelVersion:	2.6.22
303	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
304			Christoph Lameter <cl@linux-foundation.org>
305	Description:
306			The object_size file is read-only and specifies the cache's
307			object size.
308	
309	What:		/sys/kernel/slab/cache/objects
310	Date:		May 2007
311	KernelVersion:	2.6.22
312	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
313			Christoph Lameter <cl@linux-foundation.org>
314	Description:
315			The objects file is read-only and displays how many objects are
316			active and from which nodes they are from.
317	
318	What:		/sys/kernel/slab/cache/objects_partial
319	Date:		April 2008
320	KernelVersion:	2.6.26
321	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
322			Christoph Lameter <cl@linux-foundation.org>
323	Description:
324			The objects_partial file is read-only and displays how many
325			objects are on partial slabs and from which nodes they are
326			from.
327	
328	What:		/sys/kernel/slab/cache/objs_per_slab
329	Date:		May 2007
330	KernelVersion:	2.6.22
331	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
332			Christoph Lameter <cl@linux-foundation.org>
333	Description:
334			The file objs_per_slab is read-only and specifies how many
335			objects may be allocated from a single slab of the order
336			specified in /sys/kernel/slab/cache/order.
337	
338	What:		/sys/kernel/slab/cache/order
339	Date:		May 2007
340	KernelVersion:	2.6.22
341	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
342			Christoph Lameter <cl@linux-foundation.org>
343	Description:
344			The order file specifies the page order at which new slabs are
345			allocated.  It is writable and can be changed to increase the
346			number of objects per slab.  If a slab cannot be allocated
347			because of fragmentation, SLUB will retry with the minimum order
348			possible depending on its characteristics.
349			When debug_guardpage_minorder=N (N > 0) parameter is specified
350			(see Documentation/kernel-parameters.txt), the minimum possible
351			order is used and this sysfs entry can not be used to change
352			the order at run time.
353	
354	What:		/sys/kernel/slab/cache/order_fallback
355	Date:		April 2008
356	KernelVersion:	2.6.26
357	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
358			Christoph Lameter <cl@linux-foundation.org>
359	Description:
360			The order_fallback file shows how many times an allocation of a
361			new slab has not been possible at the cache's order and instead
362			fallen back to its minimum possible order.  It can be written to
363			clear the current count.
364			Available when CONFIG_SLUB_STATS is enabled.
365	
366	What:		/sys/kernel/slab/cache/partial
367	Date:		May 2007
368	KernelVersion:	2.6.22
369	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
370			Christoph Lameter <cl@linux-foundation.org>
371	Description:
372			The partial file is read-only and displays how long many
373			partial slabs there are and how long each node's list is.
374	
375	What:		/sys/kernel/slab/cache/poison
376	Date:		May 2007
377	KernelVersion:	2.6.22
378	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
379			Christoph Lameter <cl@linux-foundation.org>
380	Description:
381			The poison file specifies whether objects should be poisoned
382			when a new slab is allocated.
383	
384	What:		/sys/kernel/slab/cache/reclaim_account
385	Date:		May 2007
386	KernelVersion:	2.6.22
387	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
388			Christoph Lameter <cl@linux-foundation.org>
389	Description:
390			The reclaim_account file specifies whether the cache's objects
391			are reclaimable (and grouped by their mobility).
392	
393	What:		/sys/kernel/slab/cache/red_zone
394	Date:		May 2007
395	KernelVersion:	2.6.22
396	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
397			Christoph Lameter <cl@linux-foundation.org>
398	Description:
399			The red_zone file specifies whether the cache's objects are red
400			zoned.
401	
402	What:		/sys/kernel/slab/cache/remote_node_defrag_ratio
403	Date:		January 2008
404	KernelVersion:	2.6.25
405	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
406			Christoph Lameter <cl@linux-foundation.org>
407	Description:
408			The file remote_node_defrag_ratio specifies the percentage of
409			times SLUB will attempt to refill the cpu slab with a partial
410			slab from a remote node as opposed to allocating a new slab on
411			the local node.  This reduces the amount of wasted memory over
412			the entire system but can be expensive.
413			Available when CONFIG_NUMA is enabled.
414	
415	What:		/sys/kernel/slab/cache/sanity_checks
416	Date:		May 2007
417	KernelVersion:	2.6.22
418	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
419			Christoph Lameter <cl@linux-foundation.org>
420	Description:
421			The sanity_checks file specifies whether expensive checks
422			should be performed on free and, at minimum, enables double free
423			checks.  Caches that enable sanity_checks cannot be merged with
424			caches that do not.
425	
426	What:		/sys/kernel/slab/cache/shrink
427	Date:		May 2007
428	KernelVersion:	2.6.22
429	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
430			Christoph Lameter <cl@linux-foundation.org>
431	Description:
432			The shrink file is written when memory should be reclaimed from
433			a cache.  Empty partial slabs are freed and the partial list is
434			sorted so the slabs with the fewest available objects are used
435			first.
436	
437	What:		/sys/kernel/slab/cache/slab_size
438	Date:		May 2007
439	KernelVersion:	2.6.22
440	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
441			Christoph Lameter <cl@linux-foundation.org>
442	Description:
443			The slab_size file is read-only and specifies the object size
444			with metadata (debugging information and alignment) in bytes.
445	
446	What:		/sys/kernel/slab/cache/slabs
447	Date:		May 2007
448	KernelVersion:	2.6.22
449	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
450			Christoph Lameter <cl@linux-foundation.org>
451	Description:
452			The slabs file is read-only and displays how long many slabs
453			there are (both cpu and partial) and from which nodes they are
454			from.
455	
456	What:		/sys/kernel/slab/cache/store_user
457	Date:		May 2007
458	KernelVersion:	2.6.22
459	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
460			Christoph Lameter <cl@linux-foundation.org>
461	Description:
462			The store_user file specifies whether the location of
463			allocation or free should be tracked for a cache.
464	
465	What:		/sys/kernel/slab/cache/total_objects
466	Date:		April 2008
467	KernelVersion:	2.6.26
468	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
469			Christoph Lameter <cl@linux-foundation.org>
470	Description:
471			The total_objects file is read-only and displays how many total
472			objects a cache has and from which nodes they are from.
473	
474	What:		/sys/kernel/slab/cache/trace
475	Date:		May 2007
476	KernelVersion:	2.6.22
477	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
478			Christoph Lameter <cl@linux-foundation.org>
479	Description:
480			The trace file specifies whether object allocations and frees
481			should be traced.
482	
483	What:		/sys/kernel/slab/cache/validate
484	Date:		May 2007
485	KernelVersion:	2.6.22
486	Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,
487			Christoph Lameter <cl@linux-foundation.org>
488	Description:
489			Writing to the validate file causes SLUB to traverse all of its
490			cache's objects and check the validity of metadata.
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