linux-kernel - Re: [PATCH] setup_per_zone_pages_min(): take zone->lock instead of zone->lru

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Message-Id: <20081002185250.5767.E1E9C6FF@jp.fujitsu.com>
Date:	Thu, 02 Oct 2008 19:00:38 +0900
From:	Yasunori Goto <y-goto@...fujitsu.com>
To:	Gerald Schaefer <gerald.schaefer@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Whitcroft <apw@...dowen.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
	Mel Gorman <mel@....ul.ie>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH] setup_per_zone_pages_min(): take zone->lock instead of zone->lru_lock


Thanks!

Tested-by: Yasunori Goto <y-goto@...fujitsu.com>


> From: Gerald Schaefer <gerald.schaefer@...ibm.com> 
> 
> This replaces zone->lru_lock in setup_per_zone_pages_min() with zone->lock.
> There seems to be no need for the lru_lock anymore, but there is a need for
> zone->lock instead, because that function may call move_freepages() via
> setup_zone_migrate_reserve().
> 
> Signed-off-by: Gerald Schaefer <gerald.schaefer@...ibm.com>
> 
> ---
>  mm/page_alloc.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6/mm/page_alloc.c
> ===================================================================
> --- linux-2.6.orig/mm/page_alloc.c
> +++ linux-2.6/mm/page_alloc.c
> @@ -4207,7 +4207,7 @@ void setup_per_zone_pages_min(void)
>  	for_each_zone(zone) {
>  		u64 tmp;
>  
> -		spin_lock_irqsave(&zone->lru_lock, flags);
> +		spin_lock_irqsave(&zone->lock, flags);
>  		tmp = (u64)pages_min * zone->present_pages;
>  		do_div(tmp, lowmem_pages);
>  		if (is_highmem(zone)) {
> @@ -4239,7 +4239,7 @@ void setup_per_zone_pages_min(void)
>  		zone->pages_low   = zone->pages_min + (tmp >> 2);
>  		zone->pages_high  = zone->pages_min + (tmp >> 1);
>  		setup_zone_migrate_reserve(zone);
> -		spin_unlock_irqrestore(&zone->lru_lock, flags);
> +		spin_unlock_irqrestore(&zone->lock, flags);
>  	}
>  
>  	/* update totalreserve_pages */
> 
> 

-- 
Yasunori Goto 


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