linux-kernel - Re: [RFC][PATCH 1/8] mm: pcp: rename percpu pageset functions

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Date:	Wed, 16 Oct 2013 18:32:03 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Hansen <dave@...1.net>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Andi Kleen <ak@...ux.intel.com>, cl@...two.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: [RFC][PATCH 1/8] mm: pcp: rename percpu pageset functions

On Tue, 15 Oct 2013, Dave Hansen wrote:

> diff -puN mm/page_alloc.c~rename-pageset-functions mm/page_alloc.c
> --- linux.git/mm/page_alloc.c~rename-pageset-functions	2013-10-15 09:57:05.870612107 -0700
> +++ linux.git-davehans/mm/page_alloc.c	2013-10-15 09:57:05.875612329 -0700
> @@ -4136,10 +4136,18 @@ static void pageset_update(struct per_cp
>  	pcp->batch = batch;
>  }
>  
> -/* a companion to pageset_set_high() */
> -static void pageset_set_batch(struct per_cpu_pageset *p, unsigned long batch)
> +/*
> + * Set the batch size for hot per_cpu_pagelist, and derive
> + * the high water mark from the batch size.
> + */
> +static void pageset_setup_from_batch_size(struct per_cpu_pageset *p,
> +					unsigned long batch)
>  {
> -	pageset_update(&p->pcp, 6 * batch, max(1UL, 1 * batch));
> +	unsigned long high;
> +	high = 6 * batch;
> +	if (!batch)
> +		batch = 1;

high = 6 * batch should be here?

> +	pageset_update(&p->pcp, high, batch);
>  }
>  
>  static void pageset_init(struct per_cpu_pageset *p)
> @@ -4158,15 +4166,15 @@ static void pageset_init(struct per_cpu_
>  static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch)
>  {
>  	pageset_init(p);
> -	pageset_set_batch(p, batch);
> +	pageset_setup_from_batch_size(p, batch);
>  }
>  
>  /*
> - * pageset_set_high() sets the high water mark for hot per_cpu_pagelist
> - * to the value high for the pageset p.
> + * Set the high water mark for the per_cpu_pagelist, and derive
> + * the batch size from this high mark.
>   */
> -static void pageset_set_high(struct per_cpu_pageset *p,
> -				unsigned long high)
> +static void pageset_setup_from_high_mark(struct per_cpu_pageset *p,
> +					unsigned long high)
>  {
>  	unsigned long batch = max(1UL, high / 4);
>  	if ((high / 4) > (PAGE_SHIFT * 8))
> @@ -4179,11 +4187,11 @@ static void __meminit pageset_set_high_a
>  		struct per_cpu_pageset *pcp)
>  {
>  	if (percpu_pagelist_fraction)
> -		pageset_set_high(pcp,
> +		pageset_setup_from_high_mark(pcp,
>  			(zone->managed_pages /
>  				percpu_pagelist_fraction));
>  	else
> -		pageset_set_batch(pcp, zone_batchsize(zone));
> +		pageset_setup_from_batch_size(pcp, zone_batchsize(zone));
>  }
>  
>  static void __meminit zone_pageset_init(struct zone *zone, int cpu)
> @@ -5781,8 +5789,9 @@ int percpu_pagelist_fraction_sysctl_hand
>  		unsigned long  high;
>  		high = zone->managed_pages / percpu_pagelist_fraction;
>  		for_each_possible_cpu(cpu)
> -			pageset_set_high(per_cpu_ptr(zone->pageset, cpu),
> -					 high);
> +			pageset_setup_from_high_mark(
> +					per_cpu_ptr(zone->pageset, cpu),
> +					high);
>  	}
>  	mutex_unlock(&pcp_batch_high_lock);
>  	return 0;
--
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