From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Date: Wed, 26 Dec 2012 03:55:31 +0000
Subject: Re: [PATCH v5 14/14] memory-hotplug: free node_data when a node is offlined
Message-Id: <50DA7533.6060407@jp.fujitsu.com>
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References: <1356350964-13437-1-git-send-email-tangchen@cn.fujitsu.com> <1356350964-13437-15-git-send-email-tangchen@cn.fujitsu.com>
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To: Tang Chen <tangchen@cn.fujitsu.com>
Cc: akpm@linux-foundation.org, rientjes@google.com, liuj97@gmail.com, len.brown@intel.com, benh@kernel.crashing.org, paulus@samba.org, cl@linux.com, minchan.kim@gmail.com, kosaki.motohiro@jp.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com, wujianguo@huawei.com, wency@cn.fujitsu.com, hpa@zytor.com, linfeng@cn.fujitsu.com, laijs@cn.fujitsu.com, mgorman@suse.de, yinghai@kernel.org, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-acpi@vger.kernel.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, linux-ia64@vger.kernel.org, cmetcalf@tilera.com, sparclinux@vger.kernel.org

(2012/12/24 21:09), Tang Chen wrote:
> From: Wen Congyang <wency@cn.fujitsu.com>
> 
> We call hotadd_new_pgdat() to allocate memory to store node_data. So we
> should free it when removing a node.
> 
> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>

I'm sorry but is it safe to remove pgdat ? All zone cache and zonelists are
properly cleared/rebuilded in synchronous way ? and No threads are visinting
zone in vmscan.c ?

Thanks,
-Kame

> ---
>   mm/memory_hotplug.c |   20 +++++++++++++++++++-
>   1 files changed, 19 insertions(+), 1 deletions(-)
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index f8a1d2f..447fa24 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1680,9 +1680,12 @@ static int check_cpu_on_node(void *data)
>   /* offline the node if all memory sections of this node are removed */
>   static void try_offline_node(int nid)
>   {
> +	pg_data_t *pgdat = NODE_DATA(nid);
>   	unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
> -	unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
> +	unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
>   	unsigned long pfn;
> +	struct page *pgdat_page = virt_to_page(pgdat);
> +	int i;
>   
>   	for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
>   		unsigned long section_nr = pfn_to_section_nr(pfn);
> @@ -1709,6 +1712,21 @@ static void try_offline_node(int nid)
>   	 */
>   	node_set_offline(nid);
>   	unregister_one_node(nid);
> +
> +	if (!PageSlab(pgdat_page) && !PageCompound(pgdat_page))
> +		/* node data is allocated from boot memory */
> +		return;
> +
> +	/* free waittable in each zone */
> +	for (i = 0; i < MAX_NR_ZONES; i++) {
> +		struct zone *zone = pgdat->node_zones + i;
> +
> +		if (zone->wait_table)
> +			vfree(zone->wait_table);
> +	}
> +
> +	arch_refresh_nodedata(nid, NULL);
> +	arch_free_nodedata(pgdat);
>   }
>   
>   int __ref remove_memory(int nid, u64 start, u64 size)
>