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mm: introduce folio_is_pfmemalloc

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Add a folio equivalent for page_is_pfmemalloc. This removes two instances
of page_is_pfmemalloc(folio_page(folio, 0)) so the folio can be used
directly.

Link: https://lkml.kernel.org/r/20230106215251.599222-1-sidhartha.kumar@oracle.com
Suggested-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sidhartha Kumar 2023-01-06 15:52:51 -06:00 committed by Andrew Morton
parent 17e810229c
commit 02d65d6fb1
3 changed files with 17 additions and 2 deletions
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15
include/linux/mm.h
View file

@ -1926,6 +1926,21 @@ static inline bool page_is_pfmemalloc(const struct page *page)
return (uintptr_t)page->lru.next & BIT(1);
}
/*
* Return true only if the folio has been allocated with
* ALLOC_NO_WATERMARKS and the low watermark was not
* met implying that the system is under some pressure.
*/
static inline bool folio_is_pfmemalloc(const struct folio *folio)
{
/*
* lru.next has bit 1 set if the page is allocated from the
* pfmemalloc reserves. Callers may simply overwrite it if
* they do not need to preserve that information.
*/
return (uintptr_t)folio->lru.next & BIT(1);
}
/*
* Only to be called by the page allocator on a freshly allocated
* page.

2
mm/slab.c
View file

@ -1373,7 +1373,7 @@ static struct slab *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
/* Make the flag visible before any changes to folio->mapping */
smp_wmb();
/* Record if ALLOC_NO_WATERMARKS was set when allocating the slab */
if (sk_memalloc_socks() && page_is_pfmemalloc(folio_page(folio, 0)))
if (sk_memalloc_socks() && folio_is_pfmemalloc(folio))
slab_set_pfmemalloc(slab);
return slab;

2
mm/slub.c
View file

@ -1859,7 +1859,7 @@ static inline struct slab *alloc_slab_page(gfp_t flags, int node,
__folio_set_slab(folio);
/* Make the flag visible before any changes to folio->mapping */
smp_wmb();
if (page_is_pfmemalloc(folio_page(folio, 0)))
if (folio_is_pfmemalloc(folio))
slab_set_pfmemalloc(slab);
return slab;