linux-kernel - Re: [PATCH] mm: prefer xxx_page() alloc/free functions for order-0 pages

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Message-ID: <ZBQjz9vzFaLjW0MM@kernel.org>
Date:   Fri, 17 Mar 2023 10:24:47 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Lorenzo Stoakes <lstoakes@...il.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        David Hildenbrand <david@...hat.com>,
        Nick Piggin <npiggin@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Uladzislau Rezki <urezki@...il.com>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH] mm: prefer xxx_page() alloc/free functions for order-0
 pages

On Mon, Mar 13, 2023 at 12:27:14PM +0000, Lorenzo Stoakes wrote:
> Update instances of alloc_pages(..., 0), __get_free_pages(..., 0) and
> __free_pages(..., 0) to use alloc_page(), __get_free_page() and
> __free_page() respectively in core code.
> 
> Signed-off-by: Lorenzo Stoakes <lstoakes@...il.com>

Reviewed-by: Mike Rapoport (IBM) <rppt@...nel.org>

But why limit this only to mm?
> ---
>  include/asm-generic/pgalloc.h | 4 ++--
>  mm/debug_vm_pgtable.c         | 4 ++--
>  mm/hugetlb_vmemmap.c          | 2 +-
>  mm/mmu_gather.c               | 2 +-
>  mm/page_alloc.c               | 2 +-
>  mm/vmalloc.c                  | 2 +-
>  6 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/include/asm-generic/pgalloc.h b/include/asm-generic/pgalloc.h
> index 977bea16cf1b..a7cf825befae 100644
> --- a/include/asm-generic/pgalloc.h
> +++ b/include/asm-generic/pgalloc.h
> @@ -123,11 +123,11 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
> 
>  	if (mm == &init_mm)
>  		gfp = GFP_PGTABLE_KERNEL;
> -	page = alloc_pages(gfp, 0);
> +	page = alloc_page(gfp);
>  	if (!page)
>  		return NULL;
>  	if (!pgtable_pmd_page_ctor(page)) {
> -		__free_pages(page, 0);
> +		__free_page(page);
>  		return NULL;
>  	}
>  	return (pmd_t *)page_address(page);
> diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
> index 7887cc2b75bf..4362021b1ce7 100644
> --- a/mm/debug_vm_pgtable.c
> +++ b/mm/debug_vm_pgtable.c
> @@ -1048,7 +1048,7 @@ static void __init destroy_args(struct pgtable_debug_args *args)
> 
>  	if (args->pte_pfn != ULONG_MAX) {
>  		page = pfn_to_page(args->pte_pfn);
> -		__free_pages(page, 0);
> +		__free_page(page);
> 
>  		args->pte_pfn = ULONG_MAX;
>  	}
> @@ -1290,7 +1290,7 @@ static int __init init_args(struct pgtable_debug_args *args)
>  		}
>  	}
> 
> -	page = alloc_pages(GFP_KERNEL, 0);
> +	page = alloc_page(GFP_KERNEL);
>  	if (page)
>  		args->pte_pfn = page_to_pfn(page);
> 
> diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
> index a15cc56cf70a..1198064f80eb 100644
> --- a/mm/hugetlb_vmemmap.c
> +++ b/mm/hugetlb_vmemmap.c
> @@ -400,7 +400,7 @@ static int alloc_vmemmap_page_list(unsigned long start, unsigned long end,
>  	return 0;
>  out:
>  	list_for_each_entry_safe(page, next, list, lru)
> -		__free_pages(page, 0);
> +		__free_page(page);
>  	return -ENOMEM;
>  }
> 
> diff --git a/mm/mmu_gather.c b/mm/mmu_gather.c
> index 2b93cf6ac9ae..ea9683e12936 100644
> --- a/mm/mmu_gather.c
> +++ b/mm/mmu_gather.c
> @@ -32,7 +32,7 @@ static bool tlb_next_batch(struct mmu_gather *tlb)
>  	if (tlb->batch_count == MAX_GATHER_BATCH_COUNT)
>  		return false;
> 
> -	batch = (void *)__get_free_pages(GFP_NOWAIT | __GFP_NOWARN, 0);
> +	batch = (void *)__get_free_page(GFP_NOWAIT | __GFP_NOWARN);
>  	if (!batch)
>  		return false;
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 680a4d76460e..256e8d3c8742 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5538,7 +5538,7 @@ EXPORT_SYMBOL(__get_free_pages);
> 
>  unsigned long get_zeroed_page(gfp_t gfp_mask)
>  {
> -	return __get_free_pages(gfp_mask | __GFP_ZERO, 0);
> +	return __get_free_page(gfp_mask | __GFP_ZERO);
>  }
>  EXPORT_SYMBOL(get_zeroed_page);
> 
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index 5e60e9792cbf..978194dc2bb8 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -2739,7 +2739,7 @@ void vfree(const void *addr)
>  		 * High-order allocs for huge vmallocs are split, so
>  		 * can be freed as an array of order-0 allocations
>  		 */
> -		__free_pages(page, 0);
> +		__free_page(page);
>  		cond_resched();
>  	}
>  	atomic_long_sub(vm->nr_pages, &nr_vmalloc_pages);
> --
> 2.39.2
> 

-- 
Sincerely yours,
Mike.