linux-kernel - Re: [PATCH 01/45] writeback: reduce calls to global_page_state in balance_dirty

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Message-Id: <1255101512.8802.65.camel@laptop>
Date:	Fri, 09 Oct 2009 17:18:32 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Jan Kara <jack@...e.cz>
Cc:	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>,
	Christoph Hellwig <hch@...radead.org>,
	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Li Shaohua <shaohua.li@...el.com>,
	Myklebust Trond <Trond.Myklebust@...app.com>,
	"jens.axboe@...cle.com" <jens.axboe@...cle.com>,
	Nick Piggin <npiggin@...e.de>, linux-fsdevel@...r.kernel.org,
	Richard Kennedy <richard@....demon.co.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/45] writeback: reduce calls to global_page_state in
 balance_dirty_pages()

On Fri, 2009-10-09 at 17:12 +0200, Jan Kara wrote:
>   Ugh, but this is not equivalent! We would block the writer on some BDI
> without any dirty data if we are over global dirty limit. That didn't
> happen before.

It should have, we should throttle everything calling
balance_dirty_pages() when we're over the total limit.

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