linux-kernel - Re: [PATCH] pm_qos: remove unnecessary list-traversal

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 2 Jun 2010 08:14:32 +0200
From:	Florian Mickler <florian@...kler.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, 640e9920@...il.com,
	markgross@...gnar.org, Arve Hj?nnev?g <arve@...roid.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	Brian Swetland <swetland@...gle.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] pm_qos: remove unnecessary list-traversal

On Tue, 1 Jun 2010 12:43:21 +0200 (CEST)
Thomas Gleixner <tglx@...utronix.de> wrote:

> On Tue, 1 Jun 2010, florian@...kler.org wrote:
> 
> > The new extreme value is only depending on the old extreme value and
> > the changed value.
> 
> And how does that update to the next applicable constraint when the
> current constraint is removed ? Your patch is creating a one way
> decision.

keeping the list sorted or using an rbtree is the answer then. 

if O(1) behaviour is needed maybe another constraint type could be
implemented. Maybe using a bool or even a bitmap (to allow for 32
constraint-values). 
Is another constraint-type worthwile? 

>  
> > Signed-off-by: Florian Mickler <florian@...kler.org>
> > ---
> > This version actually compiles...  :)
> 
> That does not make it work.
> 
>      tglx

indeed.

Cheers,
Flo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/