linux-kernel - Re: [PATCH 4/4] writeback: reduce per-bdi dirty threshold ramp up time

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Date:	Tue, 24 May 2011 14:41:58 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Wu Fengguang <fengguang.wu@...el.com>,
	Dave Chinner <david@...morbit.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Richard Kennedy <richard@....demon.co.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 4/4] writeback: reduce per-bdi dirty threshold ramp up
 time

On Tue, 2011-05-24 at 14:24 +0200, Peter Zijlstra wrote:
> Again, if we then measure t in the same events as x, such that:
> 
>  t = \Sum_i x_i

> However, if you start measuring t differently that breaks, and the
> result is no longer normalized and thus not suitable as a proportion.

Ah, I made a mistake there, your proposal would keep the above relation
true, but the discrete periods t_i wouldn't be uniform.

So disregard the non normalized criticism.

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