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mm/vmalloc: add a helper to optimize vmalloc allocation gfps

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vm_area_alloc_pages() attempts to use different gfp flags as a way to
optimize allocations.  This has been done inline which makes things harder
to read.

Add a helper function to make the code more readable.

Link: https://lkml.kernel.org/r/20251121094405.40628-3-vishal.moola@gmail.com
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Reviewed-by: "Uladzislau Rezki (Sony)" <urezki@gmail.com>
Acked-by: SeongJae Park <sj@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Vishal Moola (Oracle) 2025-11-21 01:44:03 -08:00 committed by Andrew Morton
parent 07003531e0
commit bb4d3c7686
1 changed files with 14 additions and 3 deletions
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17
mm/vmalloc.c
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@ -3614,6 +3614,17 @@ void *vmap_pfn(unsigned long *pfns, unsigned int count, pgprot_t prot)
EXPORT_SYMBOL_GPL(vmap_pfn);
#endif /* CONFIG_VMAP_PFN */
/*
* Helper for vmalloc to adjust the gfp flags for certain allocations.
*/
static inline gfp_t vmalloc_gfp_adjust(gfp_t flags, const bool large)
{
flags |= __GFP_NOWARN;
if (large)
flags &= ~__GFP_NOFAIL;
return flags;
}
static inline unsigned int
vm_area_alloc_pages(gfp_t gfp, int nid,
unsigned int order, unsigned int nr_pages, struct page **pages)
@ -3852,9 +3863,9 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
* Please note, the __vmalloc_node_range_noprof() falls-back
* to order-0 pages if high-order attempt is unsuccessful.
*/
area->nr_pages = vm_area_alloc_pages((page_order ?
gfp_mask & ~__GFP_NOFAIL : gfp_mask) | __GFP_NOWARN,
node, page_order, nr_small_pages, area->pages);
area->nr_pages = vm_area_alloc_pages(
vmalloc_gfp_adjust(gfp_mask, page_order), node,
page_order, nr_small_pages, area->pages);
atomic_long_add(area->nr_pages, &nr_vmalloc_pages);
/* All pages of vm should be charged to same memcg, so use first one. */