linux-kernel - Re: [PATCH 2/2 V3] memory-hotplug: remove reset_node_managed_pages() and reset_node_managed_pages() in hotadd_new

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Message-ID: <55373F4D.6060901@huawei.com>
Date:	Wed, 22 Apr 2015 14:27:25 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Xishi Qiu <qiuxishi@...wei.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	<izumi.taku@...fujitsu.com>, Tang Chen <tangchen@...fujitsu.com>,
	Gu Zheng <guz.fnst@...fujitsu.com>,
	Xiexiuqi <xiexiuqi@...wei.com>, Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH 2/2 V3] memory-hotplug: remove reset_node_managed_pages()
 and reset_node_managed_pages() in hotadd_new_pgdat()

add CC: Tejun Heo <tj@...nel.org>

On 2015/4/21 18:15, Xishi Qiu wrote:

> After hotadd_new_pgdat()->free_area_init_node(), pgdat's spanned/present are 0,
> and zone's spanned/present/managed are 0, so remove reset_node_managed_pages()
> and reset_node_managed_pages().
> 
> Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
> ---
>  mm/memory_hotplug.c |   25 -------------------------
>  1 files changed, 0 insertions(+), 25 deletions(-)
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 49d7c07..ac6462f 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1064,16 +1064,6 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
>  }
>  #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
>  
> -static void reset_node_present_pages(pg_data_t *pgdat)
> -{
> -	struct zone *z;
> -
> -	for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
> -		z->present_pages = 0;
> -
> -	pgdat->node_present_pages = 0;
> -}
> -
>  /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */
>  static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start)
>  {
> @@ -1108,21 +1098,6 @@ static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start)
>  	build_all_zonelists(pgdat, NULL);
>  	mutex_unlock(&zonelists_mutex);
>  
> -	/*
> -	 * zone->managed_pages is set to an approximate value in
> -	 * free_area_init_core(), which will cause
> -	 * /sys/device/system/node/nodeX/meminfo has wrong data.
> -	 * So reset it to 0 before any memory is onlined.
> -	 */
> -	reset_node_managed_pages(pgdat);
> -
> -	/*
> -	 * When memory is hot-added, all the memory is in offline state. So
> -	 * clear all zones' present_pages because they will be updated in
> -	 * online_pages() and offline_pages().
> -	 */
> -	reset_node_present_pages(pgdat);
> -
>  	return pgdat;
>  }
>  



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