Date: Thu, 3 Jun 2010 16:30:49 +0200
From: Florian Mickler <florian@mickler.org>
To: markgross@thegnar.org
Cc: 640e9920@gmail.com,
       Arve =?ISO-8859-15?Q?Hj=F8nnev=E5g?= <arve@android.com>,
       Brian Swetland <swetland@google.com>, "Rafael J. Wysocki" <rjw@sisk.pl>,
       Alan Stern <stern@rowland.harvard.edu>,
       Peter Zijlstra <peterz@infradead.org>,
       Linux PM <linux-pm@lists.linux-foundation.org>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Matthew Garrett <mjg59@srcf.ucam.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)
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On Thu, 3 Jun 2010 06:24:49 -0700
mark gross <640e9920@gmail.com> wrote:

> On Thu, Jun 03, 2010 at 12:10:03AM -0700, Arve Hj?nnev?g wrote:

> ok I'm not getting it.
> is this a fancy com-sci algorithm I should know about?
> 
> --mgross

I think you are at an advantage if you have studied fancy com-sci for
this? Here is an example:

say you have 5 constraints: 
qos1 with a value of 10
qos2 with 5
qos3 with 10
qos4 with 11

Now, you hash that list by the qos-values:

11    ---- 10 	----- 5 
|	   |  	      |
qos4	   qos3       qos2
	   |
	   qos1


To compute the maximum you just walk the "----" list.

To reduce qos4 from 11 to 5 you remove it from its "|" list and
prepend it to the corresponding "|" list.  (4 Pointer adjustments +
searching the "-----" list for the right place to insert.  

result:

10 ---- 5
|	|
qos3	qos4
|	|
qos1	qos2

Cheers,
Flo
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