linux-kernel - Re: [PATCH 8/8] Per-container pages reclamation

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Message-ID: <465E93D7.2020506@linux.vnet.ibm.com>
Date:	Thu, 31 May 2007 14:52:31 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Paul Menage <menage@...gle.com>,
	Balbir Singh <balbir@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	devel@...nvz.org, Kirill Korotaev <dev@...nvz.org>
Subject: Re: [PATCH 8/8] Per-container pages reclamation

Vaidyanathan Srinivasan wrote:
> 
> Andrew Morton wrote:
>> On Wed, 30 May 2007 19:42:26 +0400
>> Pavel Emelianov <xemul@...nvz.org> wrote:
>>
> [snip]
>>> +#ifdef CONFIG_RSS_CONTAINER
>>> +unsigned long try_to_free_pages_in_container(struct rss_container *cnt)
>>> +{
>>> +	struct scan_control sc = {
>>> +		.gfp_mask = GFP_KERNEL,
>>> +		.may_writepage = 1,
>>> +		.swap_cluster_max = 1,
>>> +		.may_swap = 1,
>>> +		.swappiness = vm_swappiness,
>>> +		.order = 0, /* in this case we wanted one page only */
>>> +		.cnt = cnt,
>>> +		.isolate_pages = isolate_pages_in_container,
>>> +	};
>>> +	int node;
>>> +	struct zone **zones;
>>> +
>>> +	for_each_online_node(node) {
>>> +#ifdef CONFIG_HIGHMEM
>>> +		zones = NODE_DATA(node)->node_zonelists[ZONE_HIGHMEM].zones;
>>> +		if (do_try_to_free_pages(zones, sc.gfp_mask, &sc))
>>> +			return 1;
>>> +#endif
>>> +		zones = NODE_DATA(node)->node_zonelists[ZONE_NORMAL].zones;
>>> +		if (do_try_to_free_pages(zones, sc.gfp_mask, &sc))
>>> +			return 1;
>>> +	}
>> Definitely need to handle ZONE_DMA32 and ZONE_DMA (some architectures put
>> all memory into ZONE_DMA (or they used to))
> 

Won't the node_zonelists[ZONE_NORMAL].zones contain all lower zones (including
ZONE_DMA and ZONE_DMA32) from various nodes organized by cost?

I need to go lookup the node_zonelists creation.


-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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