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slub: Introduce freeze_slab()

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We will have unfrozen slabs out of the node partial list later, so we
need a freeze_slab() function to freeze the partial slab and get its
freelist.

Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Chengming Zhou 2023-11-02 03:23:26 +00:00 committed by Vlastimil Babka
parent 422e7d5437
commit 213094b5d1
1 changed files with 27 additions and 0 deletions
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27
mm/slub.c
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@ -3098,6 +3098,33 @@ static inline void *get_freelist(struct kmem_cache *s, struct slab *slab)
return freelist;
}
/*
* Freeze the partial slab and return the pointer to the freelist.
*/
static inline void *freeze_slab(struct kmem_cache *s, struct slab *slab)
{
struct slab new;
unsigned long counters;
void *freelist;
do {
freelist = slab->freelist;
counters = slab->counters;
new.counters = counters;
VM_BUG_ON(new.frozen);
new.inuse = slab->objects;
new.frozen = 1;
} while (!slab_update_freelist(s, slab,
freelist, counters,
NULL, new.counters,
"freeze_slab"));
return freelist;
}
/*
* Slow path. The lockless freelist is empty or we need to perform
* debugging duties.