linux-kernel - Re: [RFC PATCH 2/10] free swap space entries if vm_swap

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Message-ID: <Pine.LNX.4.64.0711061818360.5249@schroedinger.engr.sgi.com>
Date:	Tue, 6 Nov 2007 18:20:44 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Rik van Riel <riel@...hat.com>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC PATCH 2/10] free swap space entries if vm_swap_full()

On Sat, 3 Nov 2007, Rik van Riel wrote:

> @@ -1142,14 +1145,13 @@ force_reclaim_mapped:
>  		}
>  	}
>  	__mod_zone_page_state(zone, NR_INACTIVE, pgmoved);
> +	spin_unlock_irq(&zone->lru_lock);
>  	pgdeactivate += pgmoved;
> -	if (buffer_heads_over_limit) {
> -		spin_unlock_irq(&zone->lru_lock);
> -		pagevec_strip(&pvec);
> -		spin_lock_irq(&zone->lru_lock);
> -	}
>  
> +	if (buffer_heads_over_limit)
> +		pagevec_strip(&pvec);
>  	pgmoved = 0;
> +	spin_lock_irq(&zone->lru_lock);
>  	while (!list_empty(&l_active)) {
>  		page = lru_to_page(&l_active);
>  		prefetchw_prev_lru_page(page, &l_active, flags);

Why are we dropping the lock here now? There would be less activity
on the lru_lock if we would only drop it if necessary.

> @@ -1163,6 +1165,8 @@ force_reclaim_mapped:
>  			__mod_zone_page_state(zone, NR_ACTIVE, pgmoved);
>  			pgmoved = 0;
>  			spin_unlock_irq(&zone->lru_lock);
> +			if (vm_swap_full())
> +				pagevec_swap_free(&pvec);
>  			__pagevec_release(&pvec);
>  			spin_lock_irq(&zone->lru_lock);
>  		}

Same here. Maybe the spin_unlock and the spin_lock can go into
pagevec_swap_free?
-
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