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mm/page_alloc: Add folio allocation functions 

The __folio_alloc(), __folio_alloc_node() and folio_alloc() functions
are mostly for type safety, but they also ensure that the page allocator
allocates a compound page and initialises the deferred list if the page
is large enough to have one.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Matthew Wilcox (Oracle) 2020-12-15 22:55:54 -05:00
parent 0d31125d2d
commit cc09cb1341
3 changed files with 38 additions and 0 deletions
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16
include/linux/gfp.h
View File

@ -523,6 +523,8 @@ static inline void arch_alloc_page(struct page *page, int order) { }
struct page *__alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
nodemask_t *nodemask);
struct folio *__folio_alloc(gfp_t gfp, unsigned int order, int preferred_nid,
nodemask_t *nodemask);
unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
nodemask_t *nodemask, int nr_pages,
@ -564,6 +566,15 @@ __alloc_pages_node(int nid, gfp_t gfp_mask, unsigned int order)
return __alloc_pages(gfp_mask, order, nid, NULL);
}
static inline
struct folio *__folio_alloc_node(gfp_t gfp, unsigned int order, int nid)
{
VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES);
VM_WARN_ON((gfp & __GFP_THISNODE) && !node_online(nid));
return __folio_alloc(gfp, order, nid, NULL);
}
/*
* Allocate pages, preferring the node given as nid. When nid == NUMA_NO_NODE,
* prefer the current CPU's closest node. Otherwise node must be valid and
@ -580,6 +591,7 @@ static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
#ifdef CONFIG_NUMA
struct page *alloc_pages(gfp_t gfp, unsigned int order);
struct folio *folio_alloc(gfp_t gfp, unsigned order);
extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order,
struct vm_area_struct *vma, unsigned long addr,
int node, bool hugepage);
@ -590,6 +602,10 @@ static inline struct page *alloc_pages(gfp_t gfp_mask, unsigned int order)
{
return alloc_pages_node(numa_node_id(), gfp_mask, order);
}
static inline struct folio *folio_alloc(gfp_t gfp, unsigned int order)
{
return __folio_alloc_node(gfp, order, numa_node_id());
}
#define alloc_pages_vma(gfp_mask, order, vma, addr, node, false)\
alloc_pages(gfp_mask, order)
#define alloc_hugepage_vma(gfp_mask, vma, addr, order) \

10
mm/mempolicy.c
View File

@ -2202,6 +2202,16 @@ struct page *alloc_pages(gfp_t gfp, unsigned order)
}
EXPORT_SYMBOL(alloc_pages);
struct folio *folio_alloc(gfp_t gfp, unsigned order)
{
struct page *page = alloc_pages(gfp | __GFP_COMP, order);
if (page && order > 1)
prep_transhuge_page(page);
return (struct folio *)page;
}
EXPORT_SYMBOL(folio_alloc);
int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst)
{
struct mempolicy *pol = mpol_dup(vma_policy(src));

12
mm/page_alloc.c
View File

@ -5400,6 +5400,18 @@ out:
}
EXPORT_SYMBOL(__alloc_pages);
struct folio *__folio_alloc(gfp_t gfp, unsigned int order, int preferred_nid,
nodemask_t *nodemask)
{
struct page *page = __alloc_pages(gfp | __GFP_COMP, order,
preferred_nid, nodemask);
if (page && order > 1)
prep_transhuge_page(page);
return (struct folio *)page;
}
EXPORT_SYMBOL(__folio_alloc);
/*
* Common helper functions. Never use with __GFP_HIGHMEM because the returned
* address cannot represent highmem pages. Use alloc_pages and then kmap if