linux-kernel - Re: [PATCH 01/12] thp: fix the count of THP_COLLAPSE

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Date:	Mon, 13 Aug 2012 14:19:27 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	David Rientjes <rientjes@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH 01/12] thp: fix the count of THP_COLLAPSE_ALLOC

On Mon, Aug 13, 2012 at 07:13:16PM +0800, Xiao Guangrong wrote:
> THP_COLLAPSE_ALLOC is double counted if NUMA is disabled since it has
> already been calculated in khugepaged_alloc_hugepage
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

> ---
>  mm/huge_memory.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 57c4b93..80bcd42 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -1880,9 +1880,9 @@ static void collapse_huge_page(struct mm_struct *mm,
>  		*hpage = ERR_PTR(-ENOMEM);
>  		return;
>  	}
> +	count_vm_event(THP_COLLAPSE_ALLOC);
>  #endif
> 
> -	count_vm_event(THP_COLLAPSE_ALLOC);
>  	if (unlikely(mem_cgroup_newpage_charge(new_page, mm, GFP_KERNEL))) {
>  #ifdef CONFIG_NUMA
>  		put_page(new_page);
> -- 
> 1.7.7.6
> 
> --
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-- 
 Kirill A. Shutemov
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