diff options
| author | Vlastimil Babka | 2017-02-22 15:41:05 -0800 |
|---|---|---|
| committer | Linus Torvalds | 2017-02-22 16:41:27 -0800 |
| commit | af3b5f8764a270165195d8b9520d913a268c0062 (patch) | |
| tree | 614ce9413d39f904c65e8c131fb84473df5e8686 | |
| parent | 65b9de75253e909e35d8f5c42357e632fdca5d7f (diff) | |
mm, slab: rename kmalloc-node cache to kmalloc-<size>
SLAB as part of its bootstrap pre-creates one kmalloc cache that can fit
the kmem_cache_node management structure, and puts it into the generic
kmalloc cache array (e.g. for 128b objects). The name of this cache is
"kmalloc-node", which is confusing for readers of /proc/slabinfo as the
cache is used for generic allocations (and not just the kmem_cache_node
struct) and it appears as the kmalloc-128 cache is missing.
An easy solution is to use the kmalloc-<size> name when pre-creating the
cache, which we can get from the kmalloc_info array.
Example /proc/slabinfo before the patch:
...
kmalloc-256 1647 1984 256 16 1 : tunables 120 60 8 : slabdata 124 124 828
kmalloc-192 1974 1974 192 21 1 : tunables 120 60 8 : slabdata 94 94 133
kmalloc-96 1332 1344 128 32 1 : tunables 120 60 8 : slabdata 42 42 219
kmalloc-64 2505 5952 64 64 1 : tunables 120 60 8 : slabdata 93 93 715
kmalloc-32 4278 4464 32 124 1 : tunables 120 60 8 : slabdata 36 36 346
kmalloc-node 1352 1376 128 32 1 : tunables 120 60 8 : slabdata 43 43 53
kmem_cache 132 147 192 21 1 : tunables 120 60 8 : slabdata 7 7 0
After the patch:
...
kmalloc-256 1672 2160 256 16 1 : tunables 120 60 8 : slabdata 135 135 807
kmalloc-192 1992 2016 192 21 1 : tunables 120 60 8 : slabdata 96 96 203
kmalloc-96 1159 1184 128 32 1 : tunables 120 60 8 : slabdata 37 37 116
kmalloc-64 2561 4864 64 64 1 : tunables 120 60 8 : slabdata 76 76 785
kmalloc-32 4253 4340 32 124 1 : tunables 120 60 8 : slabdata 35 35 270
kmalloc-128 1256 1280 128 32 1 : tunables 120 60 8 : slabdata 40 40 39
kmem_cache 125 147 192 21 1 : tunables 120 60 8 : slabdata 7 7 0
[vbabka@suse.cz: export the whole kmalloc_info structure instead of just a name accessor, per Christoph Lameter]
Link: http://lkml.kernel.org/r/54e80303-b814-4232-66d4-95b34d3eb9d0@suse.cz
Link: http://lkml.kernel.org/r/20170203181008.24898-1-vbabka@suse.cz
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/slab.c | 3 | ||||
| -rw-r--r-- | mm/slab.h | 6 | ||||
| -rw-r--r-- | mm/slab_common.c | 5 |
3 files changed, 9 insertions, 5 deletions
diff --git a/mm/slab.c b/mm/slab.c index 4f2ec6bb46eb..be977ef6e718 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -1288,7 +1288,8 @@ void __init kmem_cache_init(void) * Initialize the caches that provide memory for the kmem_cache_node * structures first. Without this, further allocations will bug. */ - kmalloc_caches[INDEX_NODE] = create_kmalloc_cache("kmalloc-node", + kmalloc_caches[INDEX_NODE] = create_kmalloc_cache( + kmalloc_info[INDEX_NODE].name, kmalloc_size(INDEX_NODE), ARCH_KMALLOC_FLAGS); slab_state = PARTIAL_NODE; setup_kmalloc_cache_index_table(); diff --git a/mm/slab.h b/mm/slab.h index de6579dc362c..2fa824335a50 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -71,6 +71,12 @@ extern struct list_head slab_caches; /* The slab cache that manages slab cache information */ extern struct kmem_cache *kmem_cache; +/* A table of kmalloc cache names and sizes */ +extern const struct kmalloc_info_struct { + const char *name; + unsigned long size; +} kmalloc_info[]; + unsigned long calculate_alignment(unsigned long flags, unsigned long align, unsigned long size); diff --git a/mm/slab_common.c b/mm/slab_common.c index 36a263e9c81a..f266b0de1e92 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -915,10 +915,7 @@ struct kmem_cache *kmalloc_slab(size_t size, gfp_t flags) * kmalloc_index() supports up to 2^26=64MB, so the final entry of the table is * kmalloc-67108864. */ -static struct { - const char *name; - unsigned long size; -} const kmalloc_info[] __initconst = { +const struct kmalloc_info_struct kmalloc_info[] __initconst = { {NULL, 0}, {"kmalloc-96", 96}, {"kmalloc-192", 192}, {"kmalloc-8", 8}, {"kmalloc-16", 16}, {"kmalloc-32", 32}, |