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mm, slub: don't create kmalloc-rcl caches with CONFIG_SLUB_TINY 

Distinguishing kmalloc(__GFP_RECLAIMABLE) can help against fragmentation
by grouping pages by mobility, but on tiny systems the extra memory
overhead of separate set of kmalloc-rcl caches will probably be worse,
and mobility grouping likely disabled anyway.

Thus with CONFIG_SLUB_TINY, don't create kmalloc-rcl caches and use the
regular ones.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: Christoph Lameter <cl@linux.com>
This commit is contained in:
Vlastimil Babka 2022-11-15 18:19:28 +01:00
parent 90ce872c22
commit 2f7c1c1396
2 changed files with 15 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/linux/slab.h
View File

@ -336,12 +336,17 @@ enum kmalloc_cache_type {
#endif
#ifndef CONFIG_MEMCG_KMEM
KMALLOC_CGROUP = KMALLOC_NORMAL,
#else
KMALLOC_CGROUP,
#endif
#ifdef CONFIG_SLUB_TINY
KMALLOC_RECLAIM = KMALLOC_NORMAL,
#else
KMALLOC_RECLAIM,
#endif
#ifdef CONFIG_ZONE_DMA
KMALLOC_DMA,
#endif
#ifdef CONFIG_MEMCG_KMEM
KMALLOC_CGROUP,
#endif
NR_KMALLOC_TYPES
};

10
mm/slab_common.c
View File

@ -773,10 +773,16 @@ EXPORT_SYMBOL(kmalloc_size_roundup);
#define KMALLOC_CGROUP_NAME(sz)
#endif
#ifndef CONFIG_SLUB_TINY
#define KMALLOC_RCL_NAME(sz) .name[KMALLOC_RECLAIM] = "kmalloc-rcl-" #sz,
#else
#define KMALLOC_RCL_NAME(sz)
#endif
#define INIT_KMALLOC_INFO(__size, __short_size) \
{ \
.name[KMALLOC_NORMAL] = "kmalloc-" #__short_size, \
.name[KMALLOC_RECLAIM] = "kmalloc-rcl-" #__short_size, \
KMALLOC_RCL_NAME(__short_size) \
KMALLOC_CGROUP_NAME(__short_size) \
KMALLOC_DMA_NAME(__short_size) \
.size = __size, \
@ -862,7 +868,7 @@ void __init setup_kmalloc_cache_index_table(void)
static void __init
new_kmalloc_cache(int idx, enum kmalloc_cache_type type, slab_flags_t flags)
{
if (type == KMALLOC_RECLAIM) {
if ((KMALLOC_RECLAIM != KMALLOC_NORMAL) && (type == KMALLOC_RECLAIM)) {
flags |= SLAB_RECLAIM_ACCOUNT;
} else if (IS_ENABLED(CONFIG_MEMCG_KMEM) && (type == KMALLOC_CGROUP)) {
if (mem_cgroup_kmem_disabled()) {