linux-kernel - Re: suspend blockers & Android integration

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Message-ID: <1275646103.27810.39526.camel@twins>
Date:	Fri, 04 Jun 2010 12:08:23 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	tytso@....edu, Brian Swetland <swetland@...gle.com>,
	Neil Brown <neilb@...e.de>, Arve Hj?nnev?g <arve@...roid.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	Felipe Balbi <felipe.balbi@...ia.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Florian Mickler <florian@...kler.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	James Bottomley <James.Bottomley@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kevin Hilman <khilman@...prootsystems.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: suspend blockers & Android integration

On Fri, 2010-06-04 at 12:03 +0200, Ingo Molnar wrote:

> > The only 'interesting' issue I can see here is that if you create 1000 
> > CLOCK_MONOTONIC namepaces, we'd need to have a tree of trees in order to 
> > efficiently find the leftmost timer.
> 
> Realistically Android userspace would create just a single such namespace for 
> all the untrusted/unknown/uncontrolled apps, right?

Possibly, yeah. 

But it might not stop someone else from create an insane amount of them.
So we do need to deal with that, and a linear loop over all timer bases,
which then will be a user controlled quantity, just doesn't sound
right :-)
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