linux-kernel - Re: [PATCH] writeback: remove the internal 5% low bound on dirty

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Message-ID: <1282905579.1975.2141.camel@laptop>
Date:	Fri, 27 Aug 2010 12:39:39 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Neil Brown <neilb@...e.de>, Con Kolivas <kernel@...ivas.org>,
	Jan Kara <jack@...e.cz>, Rik van Riel <riel@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"david@...morbit.com" <david@...morbit.com>,
	"hch@....de" <hch@....de>, "axboe@...nel.dk" <axboe@...nel.dk>
Subject: Re: [PATCH] writeback: remove the internal 5% low bound on
 dirty_ratio

On Fri, 2010-08-27 at 18:36 +0800, Wu Fengguang wrote:
> The dirty_ratio was siliently limited in global_dirty_limits() to >= 5%.
> This is not a user expected behavior. And it's inconsistent with
> calc_period_shift(), which uses the plain vm_dirty_ratio value.
> 
> Let's rip the internal bound.
> 
> At the same time, fix balance_dirty_pages() to work with the
> dirty_thresh=0 case. This allows applications to proceed when
> dirty+writeback pages are all cleaned.
> 
> And ">" fits with the name "exceeded" better than ">=" does. Neil
> think it is an aesthetic improvement as well as a functional one :)
> 
> CC: Jan Kara <jack@...e.cz>
> CC: Rik van Riel <riel@...hat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Proposed-by: Con Kolivas <kernel@...ivas.org>
> Reviewed-by: Neil Brown <neilb@...e.de>
> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>

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