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