linux-kernel - Re: [PATCH 08/23] block: implement add_bdi

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Date:	Mon, 5 Aug 2013 13:21:19 +0200
From:	Jan Kara <jack@...e.cz>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, Dave Hansen <dave@...1.net>,
	Ning Qu <quning@...gle.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/23] block: implement add_bdi_stat()

On Sun 04-08-13 05:17:10, Kirill A. Shutemov wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> 
> We're going to add/remove a number of page cache entries at once. This
> patch implements add_bdi_stat() which adjusts bdi stats by arbitrary
> amount. It's required for batched page cache manipulations.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
  Looks good. You can add:
Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  include/linux/backing-dev.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
> index c388155..7060180 100644
> --- a/include/linux/backing-dev.h
> +++ b/include/linux/backing-dev.h
> @@ -166,6 +166,16 @@ static inline void __dec_bdi_stat(struct backing_dev_info *bdi,
>  	__add_bdi_stat(bdi, item, -1);
>  }
>  
> +static inline void add_bdi_stat(struct backing_dev_info *bdi,
> +		enum bdi_stat_item item, s64 amount)
> +{
> +	unsigned long flags;
> +
> +	local_irq_save(flags);
> +	__add_bdi_stat(bdi, item, amount);
> +	local_irq_restore(flags);
> +}
> +
>  static inline void dec_bdi_stat(struct backing_dev_info *bdi,
>  		enum bdi_stat_item item)
>  {
> -- 
> 1.8.3.2
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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