linux-kernel - Re: [PATCH v2 1/3] mm/page_alloc: Don't pass pfn to free_unref_page

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Date:   Tue, 23 Nov 2021 15:41:37 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Nicolas Saenz Julienne <nsaenzju@...hat.com>,
        akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        frederic@...nel.org, tglx@...utronix.de, peterz@...radead.org,
        mtosatti@...hat.com, nilal@...hat.com, mgorman@...e.de,
        linux-rt-users@...r.kernel.org, cl@...ux.com, ppandit@...hat.com
Subject: Re: [PATCH v2 1/3] mm/page_alloc: Don't pass pfn to
 free_unref_page_commit()

On 11/3/21 18:05, Nicolas Saenz Julienne wrote:
> free_unref_page_commit() doesn't make use of its pfn argument, so get
> rid of it.

Yeah, looks like since df1acc856923 ("mm/page_alloc: avoid conflating IRQs
disabled with zone->lock")

> Signed-off-by: Nicolas Saenz Julienne <nsaenzju@...hat.com>

Reviewed-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  mm/page_alloc.c | 17 ++++++-----------
>  1 file changed, 6 insertions(+), 11 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index c5952749ad40..9ef03dfb8f95 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -3355,8 +3355,8 @@ static int nr_pcp_high(struct per_cpu_pages *pcp, struct zone *zone)
>  	return min(READ_ONCE(pcp->batch) << 2, high);
>  }
>  
> -static void free_unref_page_commit(struct page *page, unsigned long pfn,
> -				   int migratetype, unsigned int order)
> +static void free_unref_page_commit(struct page *page, int migratetype,
> +				   unsigned int order)
>  {
>  	struct zone *zone = page_zone(page);
>  	struct per_cpu_pages *pcp;
> @@ -3405,7 +3405,7 @@ void free_unref_page(struct page *page, unsigned int order)
>  	}
>  
>  	local_lock_irqsave(&pagesets.lock, flags);
> -	free_unref_page_commit(page, pfn, migratetype, order);
> +	free_unref_page_commit(page, migratetype, order);
>  	local_unlock_irqrestore(&pagesets.lock, flags);
>  }
>  
> @@ -3415,13 +3415,13 @@ void free_unref_page(struct page *page, unsigned int order)
>  void free_unref_page_list(struct list_head *list)
>  {
>  	struct page *page, *next;
> -	unsigned long flags, pfn;
> +	unsigned long flags;
>  	int batch_count = 0;
>  	int migratetype;
>  
>  	/* Prepare pages for freeing */
>  	list_for_each_entry_safe(page, next, list, lru) {
> -		pfn = page_to_pfn(page);
> +		unsigned long pfn = page_to_pfn(page);
>  		if (!free_unref_page_prepare(page, pfn, 0)) {
>  			list_del(&page->lru);
>  			continue;
> @@ -3437,15 +3437,10 @@ void free_unref_page_list(struct list_head *list)
>  			free_one_page(page_zone(page), page, pfn, 0, migratetype, FPI_NONE);
>  			continue;
>  		}
> -
> -		set_page_private(page, pfn);
>  	}
>  
>  	local_lock_irqsave(&pagesets.lock, flags);
>  	list_for_each_entry_safe(page, next, list, lru) {
> -		pfn = page_private(page);
> -		set_page_private(page, 0);
> -
>  		/*
>  		 * Non-isolated types over MIGRATE_PCPTYPES get added
>  		 * to the MIGRATE_MOVABLE pcp list.
> @@ -3455,7 +3450,7 @@ void free_unref_page_list(struct list_head *list)
>  			migratetype = MIGRATE_MOVABLE;
>  
>  		trace_mm_page_free_batched(page);
> -		free_unref_page_commit(page, pfn, migratetype, 0);
> +		free_unref_page_commit(page, migratetype, 0);
>  
>  		/*
>  		 * Guard against excessive IRQ disabled times when we get
>