linux-kernel - Re: [PATCHv4 02/39] block: implement add_bdi

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Message-Id: <20130522110603.4B729E0090@blue.fi.intel.com>
Date:	Wed, 22 May 2013 14:06:03 +0300 (EEST)
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Dave Hansen <dave@...1.net>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	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 <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 02/39] block: implement add_bdi_stat()

Dave Hansen wrote:
> On 05/11/2013 06:22 PM, 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.
> 
> Add, but no dec?

'sub', I guess, not 'dec'. For that we use add_bdi_stat(m, item, -nr).
It's consistent with __add_bdi_stat() usage.

> I'd also move this closer to where it gets used in the series.

Okay.

-- 
 Kirill A. Shutemov
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