linux-kernel - Re: [PATCH v2 2/6] mm/mm_init.c: remove the useless dma

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Date: Tue, 26 Mar 2024 08:44:51 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Baoquan He <bhe@...hat.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, x86@...nel.org,
	linuxppc-dev@...ts.ozlabs.org, akpm@...ux-foundation.org
Subject: Re: [PATCH v2 2/6] mm/mm_init.c: remove the useless dma_reserve

On Mon, Mar 25, 2024 at 10:56:42PM +0800, Baoquan He wrote:
> Now nobody calls set_dma_reserve() to set value for dma_reserve, remove
> set_dma_reserve(), global variable dma_reserve and the codes using it.
> 
> Signed-off-by: Baoquan He <bhe@...hat.com>

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

> ---
>  include/linux/mm.h |  1 -
>  mm/mm_init.c       | 23 -----------------------
>  2 files changed, 24 deletions(-)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 0436b919f1c7..ad19350e1538 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -3210,7 +3210,6 @@ static inline int early_pfn_to_nid(unsigned long pfn)
>  extern int __meminit early_pfn_to_nid(unsigned long pfn);
>  #endif
>  
> -extern void set_dma_reserve(unsigned long new_dma_reserve);
>  extern void mem_init(void);
>  extern void __init mmap_init(void);
>  
> diff --git a/mm/mm_init.c b/mm/mm_init.c
> index 549e76af8f82..153fb2dc666f 100644
> --- a/mm/mm_init.c
> +++ b/mm/mm_init.c
> @@ -226,7 +226,6 @@ static unsigned long required_movablecore_percent __initdata;
>  
>  static unsigned long nr_kernel_pages __initdata;
>  static unsigned long nr_all_pages __initdata;
> -static unsigned long dma_reserve __initdata;
>  
>  static bool deferred_struct_pages __meminitdata;
>  
> @@ -1583,12 +1582,6 @@ static void __init free_area_init_core(struct pglist_data *pgdat)
>  					zone_names[j], memmap_pages, freesize);
>  		}
>  
> -		/* Account for reserved pages */
> -		if (j == 0 && freesize > dma_reserve) {
> -			freesize -= dma_reserve;
> -			pr_debug("  %s zone: %lu pages reserved\n", zone_names[0], dma_reserve);
> -		}
> -
>  		if (!is_highmem_idx(j))
>  			nr_kernel_pages += freesize;
>  		/* Charge for highmem memmap if there are enough kernel pages */
> @@ -2547,22 +2540,6 @@ void *__init alloc_large_system_hash(const char *tablename,
>  	return table;
>  }
>  
> -/**
> - * set_dma_reserve - set the specified number of pages reserved in the first zone
> - * @new_dma_reserve: The number of pages to mark reserved
> - *
> - * The per-cpu batchsize and zone watermarks are determined by managed_pages.
> - * In the DMA zone, a significant percentage may be consumed by kernel image
> - * and other unfreeable allocations which can skew the watermarks badly. This
> - * function may optionally be used to account for unfreeable pages in the
> - * first zone (e.g., ZONE_DMA). The effect will be lower watermarks and
> - * smaller per-cpu batchsize.
> - */
> -void __init set_dma_reserve(unsigned long new_dma_reserve)
> -{
> -	dma_reserve = new_dma_reserve;
> -}
> -
>  void __init memblock_free_pages(struct page *page, unsigned long pfn,
>  							unsigned int order)
>  {
> -- 
> 2.41.0
> 
> 

-- 
Sincerely yours,
Mike.