Subject: Re: regression in page writeback
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       Wu Fengguang <fengguang.wu@intel.com>,
       Chris Mason <chris.mason@oracle.com>,
       "Li, Shaohua" <shaohua.li@intel.com>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       "jens.axboe@oracle.com" <jens.axboe@oracle.com>
In-Reply-To: <1253697598.2277.13.camel@castor>
References: <1253601612.8439.274.camel@twins>
	 <20090922080505.GB9192@localhost> <1253606965.8439.281.camel@twins>
	 <20090922082427.GA24888@localhost> <1253608335.8439.283.camel@twins>
	 <20090922155259.GL10825@think> <20090923002220.GA6382@localhost>
	 <20090922175452.d66400dd.akpm@linux-foundation.org>
	 <20090923011758.GC6382@localhost>
	 <20090922182832.28e7f73a.akpm@linux-foundation.org>
	 <20090923014500.GA11076@localhost>
	 <20090922185941.1118e011.akpm@linux-foundation.org>
	 <1253697598.2277.13.camel@castor>
Content-Type: text/plain
Date: Wed, 23 Sep 2009 11:23:31 +0200
Message-Id: <1253697811.7695.127.camel@twins>
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 723
Lines: 16

On Wed, 2009-09-23 at 10:19 +0100, Richard Kennedy wrote:
> 
> I am concerned that the background writeout no longer stops when it
> reaches the background threshold, as balance_dirty_pages requests all
> dirty pages to be written. No doubt this is good for large linear writes
> but what about more random write workloads? 

I've not had time to look over the current code, but write-out not
stopping on reaching background threshold is a definite bug and needs to
get fixed.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/