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slab: allocate frozen pages

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Since slab does not use the page refcount, it can allocate and free frozen
pages, saving one atomic operation per free.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Reviewed-by: William Kucharski <[email protected]>
Cc: Hyeonggon Yoo <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Miaohe Lin <[email protected]>
Cc: Muchun Song <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
This commit is contained in:
Matthew Wilcox (Oracle) authored and Andrew Morton committed 2025-01-13 22:40:34 -08:00
1 parent 642975242e
commit 9aec2fb0fd
1 file changed
+3 -3
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mm/slub.c
+3 -3
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@@ -2420,9 +2420,9 @@ static inline struct slab *alloc_slab_page(gfp_t flags, int node,
unsigned int order = oo_order(oo);
if (node == NUMA_NO_NODE)
folio = (struct folio *)alloc_pages(flags, order);
folio = (struct folio *)alloc_frozen_pages(flags, order);
else
folio = (struct folio *)__alloc_pages_node(node, flags, order);
folio = (struct folio *)__alloc_frozen_pages(flags, order, node, NULL);
if (!folio)
return NULL;
@@ -2656,7 +2656,7 @@ static void __free_slab(struct kmem_cache *s, struct slab *slab)
__folio_clear_slab(folio);
mm_account_reclaimed_pages(pages);
unaccount_slab(slab, order, s);
__free_pages(&folio->page, order);
free_frozen_pages(&folio->page, order);
}
static void rcu_free_slab(struct rcu_head *h)