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mm/slub: limit number of node partial slabs only in cache creation 

SLUB sets number of minimum partial slabs for node (min_partial)
using set_min_partial(). SLUB holds at least min_partial slabs even if
they're empty to avoid excessive use of page allocator.

set_min_partial() limits value of min_partial limits value of
min_partial MIN_PARTIAL and MAX_PARTIAL. As set_min_partial() can be
called by min_partial_store() too, Only limit value of min_partial
in kmem_cache_open() so that it can be changed to value that a user wants.

[ rientjes@google.com: Fold set_min_partial() into its callers ]

Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Link: https://lore.kernel.org/r/20220307074057.902222-2-42.hyeyoo@gmail.com
This commit is contained in:
Hyeonggon Yoo 2022-03-07 07:40:55 +00:00 committed by Vlastimil Babka
parent ffb217a13a
commit 5182f3c918
1 changed files with 3 additions and 11 deletions
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14
mm/slub.c
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@ -4000,15 +4000,6 @@ static int init_kmem_cache_nodes(struct kmem_cache *s)
return 1;
}
static void set_min_partial(struct kmem_cache *s, unsigned long min)
{
if (min < MIN_PARTIAL)
min = MIN_PARTIAL;
else if (min > MAX_PARTIAL)
min = MAX_PARTIAL;
s->min_partial = min;
}
static void set_cpu_partial(struct kmem_cache *s)
{
#ifdef CONFIG_SLUB_CPU_PARTIAL
@ -4215,7 +4206,8 @@ static int kmem_cache_open(struct kmem_cache *s, slab_flags_t flags)
* The larger the object size is, the more slabs we want on the partial
* list to avoid pounding the page allocator excessively.
*/
set_min_partial(s, ilog2(s->size) / 2);
s->min_partial = min_t(unsigned long, MAX_PARTIAL, ilog2(s->size) / 2);
s->min_partial = max_t(unsigned long, MIN_PARTIAL, s->min_partial);
set_cpu_partial(s);
@ -5396,7 +5388,7 @@ static ssize_t min_partial_store(struct kmem_cache *s, const char *buf,
if (err)
return err;
set_min_partial(s, min);
s->min_partial = min;
return length;
}
SLAB_ATTR(min_partial);