linux-kernel - Re: [PATCH RFC v2] lib: Proportions with flexible period

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Message-ID: <1335868497.13683.123.camel@twins>
Date:	Tue, 01 May 2012 12:34:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jan Kara <jack@...e.cz>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH RFC v2] lib: Proportions with flexible period

On Tue, 2012-04-24 at 18:30 +0200, Jan Kara wrote:
> Implement code computing proportions of events of different type (like code in
> lib/proportions.c) but allowing periods to have different lengths. This allows
> us to have aging periods of fixed wallclock time which gives better proportion
> estimates given the hugely varying throughput of different devices - previous
> measuring of aging period by number of events has the problem that a reasonable
> period length for a system with low-end USB stick is not a reasonable period
> length for a system with high-end storage array resulting either in too slow
> proportion updates or too fluctuating proportion updates.


OK, seems sound. Thanks!
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