linux-kernel - Re: [RFC] mm/swap: Rename pagevec_lru_move_fn() as pagevec_lruvec_move

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Date:   Thu, 19 Oct 2017 17:29:18 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] mm/swap: Rename pagevec_lru_move_fn() as
 pagevec_lruvec_move_fn()

On Thu 19-10-17 14:03:14, Anshuman Khandual wrote:
> The function pagevec_lru_move_fn() actually moves pages from various
> per cpu pagevecs into per node lruvecs with a custom function which
> knows how to handle individual pages present in any given pagevec.
> Because it does movement between pagevecs and lruvecs as whole not
> to an individual list element, the name should reflect it.

I find the original name quite understandable (and shorter). I do not
think this is worth changing. It is just a code churn without a good
reason.

> Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
> ---
>  mm/swap.c | 19 ++++++++++---------
>  1 file changed, 10 insertions(+), 9 deletions(-)
> 
> diff --git a/mm/swap.c b/mm/swap.c
> index a77d68f..fcd82bc 100644
> --- a/mm/swap.c
> +++ b/mm/swap.c
> @@ -185,7 +185,7 @@ int get_kernel_page(unsigned long start, int write, struct page **pages)
>  }
>  EXPORT_SYMBOL_GPL(get_kernel_page);
>  
> -static void pagevec_lru_move_fn(struct pagevec *pvec,
> +static void pagevec_lruvec_move_fn(struct pagevec *pvec,
>  	void (*move_fn)(struct page *page, struct lruvec *lruvec, void *arg),
>  	void *arg)
>  {
> @@ -235,7 +235,7 @@ static void pagevec_move_tail(struct pagevec *pvec)
>  {
>  	int pgmoved = 0;
>  
> -	pagevec_lru_move_fn(pvec, pagevec_move_tail_fn, &pgmoved);
> +	pagevec_lruvec_move_fn(pvec, pagevec_move_tail_fn, &pgmoved);
>  	__count_vm_events(PGROTATED, pgmoved);
>  }
>  
> @@ -294,7 +294,7 @@ static void activate_page_drain(int cpu)
>  	struct pagevec *pvec = &per_cpu(activate_page_pvecs, cpu);
>  
>  	if (pagevec_count(pvec))
> -		pagevec_lru_move_fn(pvec, __activate_page, NULL);
> +		pagevec_lruvec_move_fn(pvec, __activate_page, NULL);
>  }
>  
>  static bool need_activate_page_drain(int cpu)
> @@ -310,7 +310,7 @@ void activate_page(struct page *page)
>  
>  		get_page(page);
>  		if (!pagevec_add(pvec, page) || PageCompound(page))
> -			pagevec_lru_move_fn(pvec, __activate_page, NULL);
> +			pagevec_lruvec_move_fn(pvec, __activate_page, NULL);
>  		put_cpu_var(activate_page_pvecs);
>  	}
>  }
> @@ -620,11 +620,11 @@ void lru_add_drain_cpu(int cpu)
>  
>  	pvec = &per_cpu(lru_deactivate_file_pvecs, cpu);
>  	if (pagevec_count(pvec))
> -		pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL);
> +		pagevec_lruvec_move_fn(pvec, lru_deactivate_file_fn, NULL);
>  
>  	pvec = &per_cpu(lru_lazyfree_pvecs, cpu);
>  	if (pagevec_count(pvec))
> -		pagevec_lru_move_fn(pvec, lru_lazyfree_fn, NULL);
> +		pagevec_lruvec_move_fn(pvec, lru_lazyfree_fn, NULL);
>  
>  	activate_page_drain(cpu);
>  }
> @@ -650,7 +650,8 @@ void deactivate_file_page(struct page *page)
>  		struct pagevec *pvec = &get_cpu_var(lru_deactivate_file_pvecs);
>  
>  		if (!pagevec_add(pvec, page) || PageCompound(page))
> -			pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL);
> +			pagevec_lruvec_move_fn(pvec,
> +					lru_deactivate_file_fn, NULL);
>  		put_cpu_var(lru_deactivate_file_pvecs);
>  	}
>  }
> @@ -670,7 +671,7 @@ void mark_page_lazyfree(struct page *page)
>  
>  		get_page(page);
>  		if (!pagevec_add(pvec, page) || PageCompound(page))
> -			pagevec_lru_move_fn(pvec, lru_lazyfree_fn, NULL);
> +			pagevec_lruvec_move_fn(pvec, lru_lazyfree_fn, NULL);
>  		put_cpu_var(lru_lazyfree_pvecs);
>  	}
>  }
> @@ -901,7 +902,7 @@ static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec,
>   */
>  void __pagevec_lru_add(struct pagevec *pvec)
>  {
> -	pagevec_lru_move_fn(pvec, __pagevec_lru_add_fn, NULL);
> +	pagevec_lruvec_move_fn(pvec, __pagevec_lru_add_fn, NULL);
>  }
>  EXPORT_SYMBOL(__pagevec_lru_add);
>  
> -- 
> 1.8.5.2
> 
> --
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-- 
Michal Hocko
SUSE Labs