The patch titled
Subject: slab: allocate frozen pages
has been added to the -mm mm-unstable branch. Its filename is
slab-allocate-frozen-pages.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/slab-allocate-frozen-pages.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: slab: allocate frozen pages
Date: Mon, 25 Nov 2024 21:01:47 +0000
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/20241125210149.2976098-16-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: William Kucharski <william.kucharski@xxxxxxxxxx>
Cc: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slub.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/mm/slub.c~slab-allocate-frozen-pages
+++ a/mm/slub.c
@@ -2405,9 +2405,9 @@ static inline struct slab *alloc_slab_pa
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;
@@ -2641,7 +2641,7 @@ static void __free_slab(struct kmem_cach
__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)
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-page_alloc-cache-page_zone-result-in-free_unref_page.patch
mm-make-alloc_pages_mpol-static.patch
mm-page_alloc-export-free_frozen_pages-instead-of-free_unref_page.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-post_alloc_hook.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-prep_new_page.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-get_page_from_freelist.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_cpuset_fallback.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_may_oom.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_direct_compact.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_direct_reclaim.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_slowpath.patch
mm-page_alloc-move-set_page_refcounted-to-end-of-__alloc_pages.patch
mm-page_alloc-add-__alloc_frozen_pages.patch
mm-mempolicy-add-alloc_frozen_pages.patch
slab-allocate-frozen-pages.patch
