From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH 01/45] writeback: reduce calls to global_page_state in
 balance_dirty_pages()
Date: Fri, 09 Oct 2009 17:18:32 +0200
Message-ID: <1255101512.8802.65.camel@laptop>
References: <20091007073818.318088777@intel.com>
	 <20091007074901.251116016@intel.com>  <20091009151230.GF7654@duck.suse.cz>
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Cc: Wu Fengguang <fengguang.wu@intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Theodore Tso <tytso@mit.edu>,
	Christoph Hellwig <hch@infradead.org>,
	Dave Chinner <david@fromorbit.com>,
	Chris Mason <chris.mason@oracle.com>,
	Li Shaohua <shaohua.li@intel.com>,
	Myklebust Trond <Trond.Myklebust@netapp.com>,
	"jens.axboe@oracle.com" <jens.axboe@oracle.com>,
	Nick Piggin <npiggin@suse.de>, linux-fsdevel@vger.kernel.org,
	Richard Kennedy <richard@rsk.demon.co.uk>,
	LKML <linux-kernel@vger.kernel.org>
To: Jan Kara <jack@suse.cz>
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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.