mm/slub: refactor deactivate_slab()

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Simplify deactivate_slab() by unlocking n->list_lock and retrying
cmpxchg_double() when cmpxchg_double() fails, and perform
add_{partial,full} only when it succeed.

Releasing and taking n->list_lock again here is not harmful as SLUB
avoids deactivating slabs as much as possible.

[ vbabka@suse.cz: perform add_{partial,full} when cmpxchg_double()
  succeed.

  count deactivating full slabs even if debugging flag is not set. ]

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/20220307074057.902222-3-42.hyeyoo@gmail.com

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Hyeonggon Yoo 2022-03-07 07:40:56 +00:00 • committed by Vlastimil Babka

parent 5182f3c918

commit 6d3a16d09b

1 changed files with 39 additions and 52 deletions

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mm/slub.c

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