linux-kernel - Re: [PATCH 05/13] mm: convert shrinkers to use new API

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Date:	Sat, 27 Aug 2011 01:09:30 +0800
From:	Wanlong Gao <wanlong.gao@...il.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, khlebnikov@...nvz.org
Subject: Re: [PATCH 05/13] mm: convert shrinkers to use new API

On Tue, 2011-08-23 at 18:56 +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner@...hat.com>
> 
> Modify shrink_slab() to use the new .count_objects/.scan_objects API
> and implement the callouts for all the existing shrinkers.

> +static long
> +cifs_idmap_shrinker_scan(struct shrinker *shrink, struct shrink_control *sc)
>  {
> -	int nr_to_scan = sc->nr_to_scan;
> -	int nr_del = 0;
> -	int nr_rem = 0;
>  	struct rb_root *root;
> +	long freed;
>  
>  	root = &uidtree;
>  	spin_lock(&siduidlock);
> -	shrink_idmap_tree(root, nr_to_scan, &nr_rem, &nr_del);
> +	freed = shrink_idmap_tree(root, sc->nr_to_scan);
>  	spin_unlock(&siduidlock);
>  
>  	root = &gidtree;
>  	spin_lock(&sidgidlock);
> -	shrink_idmap_tree(root, nr_to_scan, &nr_rem, &nr_del);
> +	freed += shrink_idmap_tree(root, sc->nr_to_scan);
>  	spin_unlock(&sidgidlock);
>  
> -	return nr_rem;
> +	return freed;
> +}
> +
> +/*
> + * This still abuses the nr_to_scan == 0 trick to get the common code just to
> + * count objects. There neds to be an external count of the objects in the

			  ^^^^^?
Hi Dave:
Great work. a bit comments.
Thanks
-Wanlong Gao


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