mm/slub: remove slab_lock() usage for debug operations

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All alloc and free operations on debug caches are now serialized by
n->list_lock, so we can remove slab_lock() usage in validate_slab()
and list_slab_objects() as those also happen under n->list_lock.

Note the usage in list_slab_objects() could happen even on non-debug
caches, but only during cache shutdown time, so there should not be any
parallel freeing activity anymore. Except for buggy slab users, but in
that case the slab_lock() would not help against the common cmpxchg
based fast paths (in non-debug caches) anyway.

Also adjust documentation comments accordingly.

Suggested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Acked-by: David Rientjes <rientjes@google.com>

...

This commit is contained in:

Vlastimil Babka 2022-08-23 19:03:58 +02:00

parent c7323a5ad0

commit 41bec7c33f

1 changed files with 8 additions and 11 deletions

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mm/slub.c

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