Date: Wed, 5 Jan 2005 21:59:09 -0800
From: Andrew Morton <akpm@osdl.org>
To: Andrea Arcangeli <andrea@suse.de>
Cc: nickpiggin@yahoo.com.au, riel@redhat.com, marcelo.tosatti@cyclades.com,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH][5/?] count writeback pages in nr_scanned
Message-Id: <20050105215909.7ac1f8b1.akpm@osdl.org>
In-Reply-To: <20050106054659.GS4597@dualathlon.random>
References: <Pine.LNX.4.61.0501052240250.11550@chimarrao.boston.redhat.com>
	<41DCB577.9000205@yahoo.com.au>
	<20050105202611.65eb82cf.akpm@osdl.org>
	<41DCC014.80007@yahoo.com.au>
	<20050105204706.0781d672.akpm@osdl.org>
	<20050106045932.GN4597@dualathlon.random>
	<20050105210539.19807337.akpm@osdl.org>
	<20050106051707.GP4597@dualathlon.random>
	<41DCCA68.3020100@yahoo.com.au>
	<20050105213207.721b1aae.akpm@osdl.org>
	<20050106054659.GS4597@dualathlon.random>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 706
Lines: 19

Andrea Arcangeli <andrea@suse.de> wrote:
>
> But I dislike code that works by luck,

yup, it is code which works by luck.  And it's a bit inaccurate - there is
potential for (small) further latency improvement in there.

But we do need to watch the CPU consumption in there - end_page_writeback()
already figures fairly high sometimes.

> and sure I could demonstrate it
>  if I bothered to write an artificial testcase on simulated hardware.

Could well be so.
-
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/