linux-kernel - Re: [PATCH v2] memory-hotplug: fix NR_FREE

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Date:	Thu, 08 Nov 2012 17:22:35 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	Wen Congyang <wency@...fujitsu.com>
CC:	linux-mm@...ck.org, lkml <linux-kernel@...r.kernel.org>,
	Jiang Liu <liuj97@...il.com>, Len Brown <len.brown@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Yasuaki ISIMATU <isimatu.yasuaki@...fujitsu.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	lai jiangshan <laijs@...fujitsu.com>
Subject: Re: [PATCH v2] memory-hotplug: fix NR_FREE_PAGES mismatch's fix

At 11/08/2012 05:06 PM, Wen Congyang Wrote:
> 
> When a page is freed and put into pcp list, get_freepage_migratetype()
> doesn't return MIGRATE_ISOLATE even if this pageblock is isolated.
> So we should use get_freepage_migratetype() instead of mt to check
> whether it is isolated.

In my local tree, there are some patches from isimatu, so I don't add
-s option when generating the patch. So I forgot to add:

Signed-off-by: Wen Congyang <wency@...fujitsu.com>
Reported-by: Jianguo Wu <wujianguo106@...il.com>


> ---
>  mm/page_alloc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 027afd0..795875f 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -667,7 +667,7 @@ static void free_pcppages_bulk(struct zone *zone, int count,
>  			/* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
>  			__free_one_page(page, zone, 0, mt);
>  			trace_mm_page_pcpu_drain(page, 0, mt);
> -			if (likely(mt != MIGRATE_ISOLATE)) {
> +			if (likely(get_pageblock_migratetype(page) != MIGRATE_ISOLATE)) {
>  				__mod_zone_page_state(zone, NR_FREE_PAGES, 1);
>  				if (is_migrate_cma(mt))
>  					__mod_zone_page_state(zone, NR_FREE_CMA_PAGES, 1);

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